Enhanced ITU-T G.168 Echo Cancellation [Cisco IOS Software Releases 12.2 Special and Early Deployments]

Table Of Contents

Enhanced ITU-T G.168 Echo Cancellation

Contents

Restrictions

Information About Enhanced ITU-T G.168 Echo Cancellation

Enhanced ITU-T G.168 Echo Cancellation

Voice Paths

Basics of Echo Canceller Operation

Echo Canceller Components

Convolution processor

Nonlinear processor

Echo

Echo Canceller Coverage

How to Configure Enhanced ITU-T G.168 Echo Cancellation

Switching Echo Cancellers

Shutting Down All T1 Voice Ports

Shutting Down the T1 Controller

Changing Codec Complexity

Adding Back the PRI Groups and DS-0 Groups

Reapplying Voice-Port and Serial Interface Configurations

Reassigning Voice Ports to Dial-Peer Configurations

Bringing the T1 Controller Back Up

Enabling the Extended EC on the Cisco 1700 Series and Cisco ICS7750

Changing Codec Complexity on the Cisco 7200 Series

Configuring Echo Cancellation Parameters

Verifying Codec Complexity Settings

Verifying Analog and Digital Voice Port Configurations

Configuration Examples for Enhanced ITU-T G.168 Echo Cancellation

Enabling the Echo Canceller Example

Switching the Echo Canceller Example

Enabling the Extended EC on the Cisco 1700 Series and Cisco ICS 7750 Example

Changing Codec Complexity on the Cisco 7200 Series Example

Adjusting the Echo Canceller Size Example

Worst-Case Echo Return Loss Example

Checking the Active Calls Example

Additional References

Related Documents

RFCs

Standards

MIBs

Technical Assistance

Command Reference

Obsolete and Replaced Commands

codec complexity

comfort-noise

destination-pattern

dial-peer voice

ds0-group

dspint dspfarm

echo cancel coverage

echo cancel enable

echo-cancel erl worst-case

echo suppressor

non-linear

port (dial peer)

prefix

show call active

show voice call

test call id

voice-card

voice-port

Glossary

Enhanced ITU-T G.168 Echo Cancellation

This document describes the third-party G.168 extended echo canceller (EC) used in Cisco gateways with Cisco IOS Release 12.2(13)ZH. The extended EC uses the Cisco voice digital signal processor (DSP) code base (DSPWare).

The Enhanced ITU-T G.168 Echo Cancellation feature provides an alternative to the default Cisco-proprietary G.165 EC. The new extended EC provides improved performance for trunking gateway applications and provides a configurable tail length that supports up to 64 ms of echo cancellation.

The extended EC offers the following improvements over the Cisco default EC:

•Complies with the ITU-T G.168 (2000) standard in addition to maintaining support for the old ITU-T G.165 standard.

•Increases the configurable tail length from a maximum of 32 ms to a maximum of 64 ms.

Note Tone detection and echo disabling are performed outside the EC automatically in the DSP firmware.

Cisco IOS software supports the following improvements with the extended EC:

•Configuration and reporting of extended echo path capacity

•Configuration and reporting of worst-case echo return loss (ERL)

•Test mode support for manually freezing, thawing, and clearing the EC h-register

•Reporting of statistics for location of the largest reflector

•Reporting of the internal state of the EC

This feature provides the following additional benefits:

•No changes to platform—Improves platform functionality by updating the EC module through a DSPWare upgrade and a Cisco IOS software upgrade

•Enabling and disabling of nonlinear processor—Enables and disables nonlinear processor (NLP) spectrally matched comfort noise

•Echo return loss (ERL) configuration—Can be set to three values: 0 dB, 3 dB, and 6 dB

•Expansion of Echo Canceller Capacity—EC capacity is expanded to 64 ms

Table 1 contains specific high-complexity and medium-complexity support listed by platform. For hardware support documentation, refer to links provided in the "Related Documents" section.

Feature Specifications for Enhanced ITU-T G.168 Echo Cancellation

Feature History

Release

Modification

12.2(13)T

This feature was introduced.

12.2(13)ZH

This feature replaces the Cisco G.165 EC with the extended G.168 EC as default on the Cisco 1700 series and the Cisco 7750.

Supported Platforms

For platforms supported in Cisco IOS Release 12.2(13)ZH, consult Cisco Feature Navigator.

Determining Platform Support Through Cisco Feature Navigator

Cisco IOS software is packaged in feature sets that are supported on specific platforms. To get updated information regarding platform support for this feature, access Cisco Feature Navigator. Cisco Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature.

Cisco Feature Navigator is a web-based tool that enables you to determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image. You can search by feature or release. Under the release section, you can compare releases side by side to display both the features unique to each software release and the features in common.

To access Cisco Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check verifies that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions found at this URL:

http://www.cisco.com/register

Cisco Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. For the most current information, go to the Cisco Feature Navigator home page at the following URL:

http://www.cisco.com/go/fn

Availability of Cisco IOS Software Images

Platform support for particular Cisco IOS software releases is dependent on the availability of the software images for those platforms. Software images for some platforms may be deferred, delayed, or changed without prior notice. For updated information about platform support and availability of software images for each Cisco IOS software release, refer to the online release notes or, if supported, Cisco Feature Navigator.

Table 1 Extended Echo Canceller Algorithm Coverage by Platform

Platform

Module

High Complexity

Medium Complexity

Comments

Analog

Digital

Analog

Digital

Cisco 1700 series

12.2.13T, 12.2(8)YN

12.2.13T, 12.2(8)YN

12.2.13T, 12.2(8)YN

NA

Flexi6 support in Cisco IOS Release 12.2(8)YN.

For extended EC configuration information for the Cisco 1700 series, see the following sections:

•Enabling the Extended EC on the Cisco 1700 Series and Cisco ICS7750

•Enabling the Extended EC on the Cisco 1700 Series and Cisco ICS 7750 Example

Cisco 2600 series
Cisco 2600XM
Cisco 3600 series
Cisco 3700 series Cisco VG200

NM-HDV (C549)

NA

12.2(13)T

NA

12.2(13)T

Full support

NM-1V,
(C542)

No

NA

No

NA

Cisco AS5300

NA

No

NA

No

Note See your Cisco representative for information about EC support on the Cisco AS5300.

Cisco AS5350, Cisco AS5400, Cisco AS5850

NA

NA

NA

NA

Different DSP with its own 128ms-coverage EC

Cisco 7200 series

PA-VXx-2TE1+ and PA-MCX-nTE1

NA

12.2(13)T

NA

12.2(13)T

PA-MCX-nTE1 port adapters do not have their own DSPs, so they use the DSPs of PA-VXx-2TE1+ port adapters.

For extended EC configuration information for the Cisco 7200 series, see the "Changing Codec Complexity on the Cisco 7200 Series" section

Cisco 7500 series

NA

12.2(13)T

NA

No

No medium complexity

Cisco ICS7750

12.2(13)T, 12.2(13)ZH

12.2(13)T, 12.2(13)ZH

12.2(13)T, 12.2(8)YN

NA

Flexi6 support.

For extended EC configuration information for the Cisco ICS7750, see the following sections:

•Enabling the Extended EC on the Cisco 1700 Series and Cisco ICS7750

•Enabling the Extended EC on the Cisco 1700 Series and Cisco ICS 7750 Example

Cisco MC3810

HCM 549

12.2(13)T

12.2(13)T

NA

NA

Full support

Contents

•Restrictions

•Information About Enhanced ITU-T G.168 Echo Cancellation

•How to Configure Enhanced ITU-T G.168 Echo Cancellation

•Configuration Examples for Enhanced ITU-T G.168 Echo Cancellation

•Additional References

•Command Reference

•Glossary

Restrictions

•Not all Cisco platforms that use C542 and C549 DSPs support the extended EC. All other platforms continue to use the Cisco-proprietary 32-ms EC by default.

•The G.168 extended EC is not supported on the Cisco AS5300 in this release. See your account representative for information about support for the extended EC on the Cisco AS5300.

•The Cisco 1700 series does not support the T1/E1 card in Cisco IOS Release 12.2(13)T.

•The NM-2V does not support the extended EC on the Cisco 2600, Cisco 2600XM, Cisco 3600 series, Cisco 3700 series, or Cisco VG200.

Information About Enhanced ITU-T G.168 Echo Cancellation

To configure the Enhanced ITU-T G.168 Echo Cancellation feature, you must understand the following concepts:

•Enhanced ITU-T G.168 Echo Cancellation

•Voice Paths

•Basics of Echo Canceller Operation

•Echo Canceller Components

•Echo

•Echo Canceller Coverage

•How to Configure Enhanced ITU-T G.168 Echo Cancellation

Enhanced ITU-T G.168 Echo Cancellation

Echo is the sound of your own voice reverberating in the telephone receiver while you are talking. When timed properly, echo is not a problem in the conversation; however, if the echo interval exceeds approximately 25 ms, it can be distracting to the speaker. Echo is controlled by ECs. By design, ECs are limited by the total amount of time they wait for the reflected speech to be received, which is known as an echo tail. The echo tail is normally 32 ms.

In the traditional telephony network, echo is generally caused by an impedance mismatch when the four-wire network is converted to the two-wire local loop. Echo cancellation is required because of packet network latency.

Echo cancellation is implemented in DSP firmware on the gateways and is independent of other functions implemented in the DSP (the DSP protocol and compression algorithm). In voice packet-based networks, ECs are built into the low-bit-rate codecs and are operated on each DSP. Figure 1 shows a common voice network where echo cancellation might be used, and Figure 2 shows a typical DSP channel configured for voice processing.

Figure 1 Echo Cancellation Network

Figure 2 DSP Channel Configured for Voice Processing

Voice Paths

Every voice conversation has at least two participants. From the perspective of each participant, there are two voice paths in every call:

•Transmit path (also called the send or Tx path)—The transmit path is created when a person speaks. The sound is transmitted from the mouth of the speaker to the ear of the listener.

•Receive path (also called the return or Rx path)—The receive path is created when a person hears the conversation. The sound is received by the ear of the listener from the mouth of the speaker.

Figure 3 shows a simple voice call between caller A and caller B. The top line represents the Tx path for caller A, which becomes the Rx path for caller B. The bottom line represents the Tx path for caller B, which becomes the Rx path for caller A.

Figure 3 Echo in a Voice Network

An echo canceller is a component of a voice gateway that reduces the level of echoes that leak from the Rx path (from the gateway out into the tail circuit) into the Tx path (from the tail circuit into the gateway). Rx and Tx here are from the perspective of the voice gateway.

Echo cancellers face into the PSTN tail circuit. They eliminate echoes in the tail circuit on its side of the network.

From the perspective of the echo canceller in a voice gateway, the Rx signal is a voice coming across the network from another location. The Tx signal is a mixture of the voice call in the other location and the echo of the original voice, which comes from the tail circuit on the initiating end and is sent to the receiving end.

The echo canceller in the originating gateway looks out into the tail circuit and is responsible for eliminating echo signal from the initiation Tx signal and allowing a voice call to go through unimpeded.

Note Delay and jitter in the WAN do not affect the operation of the echo canceller because the tail circuit, where the echo canceller operates, is static.

Basics of Echo Canceller Operation

An echo canceller removes the echo portion of the signal coming out of the tail circuit and headed into the WAN. It does so by learning the electrical characteristics of the tail circuit and forming its own model of the tail circuit in its memory, and creating an estimated echo signal based on the current and past Rx signal. It subtracts the estimated echo from the actual Tx signal coming out of the tail circuit. The quality of the estimation is continuously improved by monitoring the estimation error.

The analog circuit is known as the tail circuit. It forms the tail or termination of the call from the perspective of the person experiencing the echo.

A packet voice gateway is a gateway between a digital packet network and a public switched telephone network (PSTN). It can include both digital (TDM) and analog links.

The tail circuit is everything connected to the PSTN side of a packet voice gateway—all the switches, multiplexers, cabling, and PBXs between the voice gateway and the telephone.

Echo Canceller Components

A typical echo canceller includes two components: Convolution processor (CP) and a nonlinear processor (NLP).

Convolution processor

The CP first stage captures and stores the outgoing signal toward the far-end hybrid. The CP then switches to monitoring mode and, when the echo signal returns, estimates the level of the incoming echo signal and subtracts the attenuated original voice signal from the echo signal.

The time required to adjust the level of attenuation needed to the original signal is called the convergence time. Because the convergence process requires that the voice signal be stored in memory, the EC has limited coverage of tail circuit delay, normally 64 ms, 96 ms, and up to 128 ms. After convergence, the CP provides about 18 dB of echo return loss enhancement (ERLE). Because a typical analog phone circuit provides at least 12 dB of echo return loss (ERL) (that is, the echo path loss between the echo canceller and the far-end hybrid), the expected permanent ERL of the converged echo canceller is about 30 dB or greater.

Nonlinear processor

In single-talk mode, that is, when one person is talking and the other is silent, the NLP replaces the residual echo at the output of the echo canceller with comfort noise based on the actual background noise of the voice path. The background noise normally changes over the course of a phone conversation, so the NLP must adapt over time. The NLP provides an additional loss of at least 25 dB when activated. In double-talk mode, the NLP must be deactivated because it would create a one-way voice effect by adding 25 to 30 dB of loss in only one direction.

To completely eliminate the perception of echo, the Talker Echo Loudness Rating (TELR) should be greater than 65 dB in all situations. To reflect this reality, ITU-T Recommendation G.168 regarding echo canceller requires an ERL equal to or greater than 55 dB. Segmentation Local Reference (SLR), Receive Loudness Rating (RLR), and Cell Loss Ratio (CLR) along the echo path should allow another 10 dB to meet the expected TELR. CP, NLP and Loudness Ratings (LRs) must be optimized to make sure that echo is canceled effectively.

Echo

Following are descriptions of the primary measurements of relative signal levels used by echo cancellers. They are all expressed in dB.

•Echo return loss (ERL)—Reduction in the echo level produced by the tail circuit without the use of an echo canceller. If an Rx speech signal enters the tail circuit from the network at a level of X dB, the echo coming back from the tail circuit into the echo canceller is (X—ERL).

•Echo return loss enhancement (ERLE)—Additional reduction in echo level accomplished by the echo canceller. An echo canceller is not a perfect device; the best it can do is attenuate the level of the returning echo. ERLE is a measure of this echo attenuation. It is the difference between the echo level arriving from the tail circuit at the echo canceller and the level of the signal leaving the echo canceller.

•Acombined (ACOM)—Total ERL seen across the terminals of the echo canceller. ACOM is the sum of ERL + ERLE, or the total ERL seen by the network.

For more information about the echo canceller, refer to the Echo Analysis for Voice over IP document on Cisco.com.

Echo Canceller Coverage

Echo canceller coverage (also known as tail coverage or tail length) is the length of time that the echo canceller stores its approximation of an echo in memory. It is the maximum echo delay that an echo canceller is able to eliminate.

The echo canceller faces into a static tail circuit with input and an output. If a word enters a tail circuit, the echo is a series of delayed and attenuated versions of that word, depending on the number of echo sources and the delays associated with them. After a certain period of time, no more signal comes out. This time period is known as the ringing time of the tail circuit—the time required for all of the ripples to disperse. To fully eliminate all echoes, the coverage of the echo canceller must be as long as the ringing time of the tail circuit.

How to Configure Enhanced ITU-T G.168 Echo Cancellation

This section contains procedures for configuring the Enhanced ITU-T G.168 Echo Cancellation feature. Each procedure is identified as either required or optional.

•Switching Echo Cancellers (optional)

•Configuring Echo Cancellation Parameters (optional)

•Verifying Codec Complexity Settings (optional)

•Verifying Analog and Digital Voice Port Configurations (optional)

Switching Echo Cancellers

To add, switch, or remove the extended EC in high-complexity mode without reloading the router, perform the following tasks in the order listed:

1. Shutting Down All T1 Voice Ports

2. Shutting Down the T1 Controller

3. Changing Codec Complexity

4. Adding Back the PRI Groups and DS-0 Groups

5. Reapplying Voice-Port and Serial Interface Configurations

6. Reassigning Voice Ports to Dial-Peer Configurations

7. Bringing the T1 Controller Back Up

Note To switch ECs on the Cisco 1700 or Cisco ICS7750, you need use only the codec complexity command. See the "Enabling the Extended EC on the Cisco 1700 Series and Cisco ICS7750" section for configuration steps. See also the "Enabling the Extended EC on the Cisco 1700 Series and Cisco ICS 7750 Example" section.

8. Enabling the Extended EC on the Cisco 1700 Series and Cisco ICS7750

Shutting Down All T1 Voice Ports

SUMMARY STEPS

1. enable

2. configure {terminal | memory | network}

3. voice-port slot/port:ds0-group

4. shutdown

5. exit

DETAILED STEPS
Command or Action

Purpose

Step 1

enable
Example:

Router> enable

Enables higher privilege levels, such as privileged EXEC mode.

Enter your password if prompted.

Step 2

configure {terminal}
Example:

Router# configure terminal

Enters global configuration mode.

Step 3

voice-port slot/port:ds0-group
Example:

Router(config)# voice-port 1/0:23

Enters voice port configuration mode on the selected slot, port, and DS-0 group.
Step 4
shutdown
Example:
Router(config-voiceport)# shutdown
Shuts down all voice ports assigned to the T1 interface on the voice card.
Step 5
exit
Example:
Router(config-voiceport)# exit
Exits voice-port configuration mode.
Shutting Down the T1 Controller

SUMMARY STEPS

1. enable

2. configure {terminal | memory | network}

3. controller t1 1/0

4. shutdown

5. no ds0-group ds0-group timeslots timeslot-list type {e&m-immediate | e&m-delay | e&m-wink | fxs-ground-start | fxs-loop-start | fxo-ground-start | fxo-loop-start}

Or

6. no pri-group timeslots timeslot-list

7. exit

DETAILED STEPS
Command or Action

Purpose

Step 1

enable
Example:

Router> enable

Enables higher privilege levels, such as privileged EXEC mode.

Enter your password if prompted.

Step 2

configure {terminal}
Example:

Router# configure terminal

Enters global configuration mode.
Step 3
controller t1 1/0
Example:
Router(config)# controller t1 1/0
Enters controller configuration mode on the T1 controller on the selected slot and port.
Step 4
shutdown
Example:
Router(config-controller)# shutdown
Shuts down the T1 controller.
Step 5

no ds0-group ds0-group timeslots timeslot-list type {e&m-immediate | e&m-delay | e&m-wink | fxs-ground-start | fxs-loop-start | fxo-ground-start | fxo-loop-start}
Example:

Router(config-controller)# ds0-group ds0-group timeslots timeslot-list type fxs-loop-start

Defines the T1 or E1 channels for use by compressed voice calls and the signaling method that the router uses to connect to the private branch exchange (PBX) or central office (CO).

Note If you are configuring PRI groups instead of DS0 groups, skip this step and proceed to Step 6.

Step 6

no pri-group timeslots timeslot-list
Example:

Router(config-controller)# pri-group timeslots timeslot-list

Specifies an ISDN Primary Rate Interface (PRI) on a channelized T1 or E1 controller.

Note When configuring PRI groups, you must also configure the isdn switch-type command. Also, only one PRI group can be configured on a controller.
Step 7
exit
Example:
Router(config-controller) exit
Exits controller configuration mode on the T1 controller.
Changing Codec Complexity

Note If you are configuring a Cisco 7200 series, see the "Changing Codec Complexity on the Cisco 7200 Series" section and also the "Changing Codec Complexity on the Cisco 7200 Series Example" section.

Note You must first clear all calls on the system before changing codec complexity.

SUMMARY STEPS

1. enable

2. configure {terminal | memory | network}

3. voice-card slot

4. codec complexity {high | medium} [ecan-extended]

5. end

DETAILED STEPS
Command or Action

Purpose

Step 1

enable
Example:

Router> enable

Enables higher privilege levels, such as privileged EXEC mode.

•Enter your password if prompted.

Step 2

configure {terminal | memory | network}
Example:

Router# configure terminal

Enters global configuration mode.
Step 3
voice-card slot
Example:
Router(config)# voice-card 1
Enters voice-card configuration mode on the specified slot.
Step 4
codec complexity {high | medium} [ecan-extended]
Example:
Router(voice-card)# codec complexity high 
ecan-extended
Example:
Router(voice-card)# codec complexity medium 
ecan-extended
Changes the codec complexity to high or medium and switches from the Cisco proprietary G.165-compliant EC (medium-complexity) to the extended EC (high-complexity).

Note To switch echo cancellers on the Cisco 1700 series or Cisco ICS7750, see the "Enabling the Extended EC on the Cisco 1700 Series and Cisco ICS7750" section for configuration information.

Note To change codec complexity on the Cisco 7200 series, see the "Changing Codec Complexity on the Cisco 7200 Series Example" section.
Step 5
end
Example:
Router(voice-card)# end
Exits voice-card configuration mode and completes the steps for changing the codec complexity and switching to the extended EC.
Adding Back the PRI Groups and DS-0 Groups

Note You must first clear all calls on the system before adding back PRI groups and DS-0 groups.

SUMMARY STEPS

1. enable

2. configure {terminal | memory | network}

3. controller t1 1/0

4. ds0-group ds0-group timeslots timeslot-list type {e&m-immediate | e&m-delay | e&m-wink | fxs-ground-start | fxs-loop-start | fxo-ground-start | fxo-loop-start}

Or

5. pri-group timeslots timeslot-list

6. exit

DETAILED STEPS
Command or Action

Purpose

Step 1

enable
Example:

Router> enable

Enables higher privilege levels, such as privileged EXEC mode.

•Enter your password if prompted.

Step 2

configure {terminal | memory | network}
Example:

Router# configure terminal

Enters global configuration mode.
Step 3
controller t1 1/0
Example:
Router(config)# controller t1 1/0
Enters controller configuration mode on the T1 controller on the selected slot and port.
Step 4

ds0-group ds0-group timeslots timeslot-list type {e&m-immediate | e&m-delay | e&m-wink | fxs-ground-start | fxs-loop-start | fxo-ground-start | fxo-loop-start}
Example:

Router(config-controller)# ds0-group ds0-group timeslots timeslot-list type fxs-loop-start

Defines the T1 or E1 channels for use by compressed voice calls and the signaling method that the router uses to connect to the private branch exchange (PBX) or central office (CO).

Note If you are configuring PRI groups instead of DS0 groups, skip this step and proceed to Step 5.

Step 5

pri-group timeslots timeslot-list
Example:

Router(config-controller)# pri-group timeslots timeslot-list

Specifies an ISDN Primary Rate Interface (PRI) on a channelized T1 or E1 controller.

Note When configuring PRI groups, you must also configure the isdn switch-type command. Also, only one PRI group can be configured on a controller.
Step 6
exit
Example:
Router(config-controller)# exit
Exits controller configuration mode and completes the process for adding back the PRI groups or DS-0 groups.
Reapplying Voice-Port and Serial Interface Configurations

Note You must first clear all calls on the system before reapplying voice-port and serial interface configurations.

SUMMARY STEPS

1. enable

2. configure {terminal | memory | network}

3. voice-port slot/port:ds0-group-no

4. exit

DETAILED STEPS
Command or Action

Purpose

Step 1

enable
Example:

Router> enable

Enables higher privilege levels, such as privileged EXEC mode.

•Enter your password if prompted.

Step 2

configure {terminal | memory | network}
Example:

Router# configure terminal

Enters global configuration mode.

Step 3

voice-port slot/port:ds0-group-no
Example:

Router(config)# voice-port 1/0:0

Enters voice-port configuration mode and reapplies voice-port or serial interface configuration to the first T1 interface.

•Each defined DS-0 group number is represented on a separate voice port. This allows you to define individual DS-0s on the digital T1/E1 card.
Step 4
exit
Example:
Router(config-voiceport)# exit
Exits voice-port configuration mode and completes reapplying voice-ports and serial interface configurations.
Reassigning Voice Ports to Dial-Peer Configurations

Note You must first clear all calls on the system before reassigning voice-ports to dial-peer configurations.

Note If you are using PRI, you might need to reapply the D channel configuration.

SUMMARY STEPS

1. enable

2. configure {terminal | memory | network}

3. dial-peer voice tag pots

4. port slot-number/subunit-number/port

DETAILED STEPS

Command or Action

Purpose

Step 1

enable
Example:

Router> enable

Enables higher privilege levels, such as privileged EXEC mode.

•Enter your password if prompted.

Step 2

configure {terminal}
Example:

Router# configure terminal

Enters global configuration mode.

Step 3

dial-peer voice tag pots
Example:

Router(config)# dial-peer voice 133001 pots

Enters dial-peer configuration mode and configures a POTS peer using a unique numeric identifier tag.

Step 4

port slot-number/subunit-number/port
Example:

Router(config-dial-peer)# port 1/0/0

Associates a dial peer with a specific voice port.

Step 5

end
Example:

Router(config-dial-peer)# end

Exits dial-peer configuration mode and completes the reassignment of voice ports to dial-peer configurations.

Bringing the T1 Controller Back Up

SUMMARY STEPS

1. enable

2. configure {terminal | memory | network}

3. controller t1 slot/port

4. no shutdown

5. end

DETAILED STEPS
Command or Action

Purpose

Step 1

enable
Example:

Router> enable

Enables higher privilege levels, such as privileged EXEC mode.

Enter your password if prompted.

Step 2

configure {terminal}
Example:

Router# configure terminal

Enters global configuration mode.
Step 3
controller t1 slot/port
Example:
Router(config)# controller t1 1/0
Specifies the T1 controller slot and port and enters controller configuration mode.
Step 4
no shutdown
Example:
Router(config-controller)# no shutdown
Saves the controller configurations on the slot and port specified.
Step 5
end
Example:
Router(config-controller)# end
Exits controller configuration mode and completes the process to bring the T1 controller back up.
This completes the steps for switching ECs and configuring EC parameters on digital voice ports on the Cisco 2600 series, Cisco 2600XM, Cisco 3600 series, Cisco 3700 series, Cisco 7200 series, Cisco MC3810, and Cisco VG200.

Enabling the Extended EC on the Cisco 1700 Series and Cisco ICS7750

The codec complexity medium command enables the extended echo canceller by default on the Cisco 1700 series and the Cisco ICS7750 in Cisco IOS release 12.2(13)ZH.

See Table 1 for extended EC algorithm coverage by platform.

Note You must clear all calls on the system before using the following commands. If there are active calls on the system, the commands are ignored and a warning message is issued.

SUMMARY STEPS

1. enable

2. configure {terminal | memory | network}

3. voice-card slot

4. codec complexity {high | medium}

5. end

DETAILED STEPS
Command or Action

Purpose

Step 1

enable
Example:

Router> enable

Enables higher privilege levels, such as privileged EXEC mode.

Enter your password if prompted.

Step 2

configure {terminal}
Example:

Router# configure terminal

Enters global configuration mode.
Step 3
voice-card slot
Example:
Router(config)# voice-card 1
Enters voice card configuration mode on the specified slot.
Step 4
codec complexity {medium}
Example:
Router(voice-card)# codec complexity medium 
Enables the extended EC (default).
Step 5
end
Example:
Router(voice-card)# end
Exits voice-card configuration mode and completes the steps for configuring the extended EC on the Cisco 1700 series and Cisco ICS7750.
Changing Codec Complexity on the Cisco 7200 Series

On the Cisco 7200 series, the PA-MCX-2TE1 port adapter (PA) card can be used for making voice calls. This PA does not have any DSPs but uses the DSP resources of the PA-VXC-2TE1+ card present in another slot. If the PA-MCX card is used, codec complexity is configured for PA-VXC, while all other echo cancellation configurations are done for PA-MCX.

The PA-MCX card borrows the DSP resources from the PA-VXC, PA-VXB, or PA-VXA cards. Even if one of the PA-VXC, PA-VXB, or PA-VXA cards has extended echo cancellation configured on the DSP interface, the extended echo cancellation CLI is enabled for the PA-MCX card. It is recommended that the same codec complexity and echo cancellation configurations be present on all the PA-VXC, PA-VXB, or PA-VXA cards in the router.

See Table 1 for extended EC algorithm coverage by platform.

Note You must clear all calls on the system before using the following commands. If there are active calls on the system, the commands are ignored and a warning message is issued.

SUMMARY STEPS

1. enable

2. configure {terminal | memory | network}

3. dspint dspfarm slot/0

4. codec complexity {high | medium} [ecan-extended]

5. end

DETAILED STEPS
Command or Action

Purpose

Step 1

enable
Example:

Router> enable

Enables higher privilege levels, such as privileged EXEC mode.

Enter your password if prompted.

Step 2

configure {terminal}
Example:

Router# configure terminal

Enters global configuration mode.
Step 3
dspint dspfarm slot/0
Example:
Router(config)# dspint dspfarm 2/0
Enables the digital signal processor (DSP) interface on the specified slot and port.
Step 4
codec complexity {high | medium} [ecan-extended]
Example:
Router(config-dspfarm)# codec complexity medium 
ecan-extended
Changes the codec complexity to high or medium on the Cisco 7200 series.
Step 5
end
Example:
Router(voice-card)# end
Exits to global configuration mode and completes the steps for changing the codec complexity on the Cisco 7200 series.
Configuring Echo Cancellation Parameters

In Cisco voice implementations, ECs are enabled using the echo cancel enable command, and echo tails are configured using the echo cancel coverage command.

To configure parameters related to the extended EC, use the following commands beginning in user EXEC mode.

SUMMARY STEPS

1. enable

2. configure {terminal | memory | network}

3. voice-port slot/port:ds0-group-no

4. echo cancel enable

5. echo suppressor seconds

6. echo cancel coverage {8 | 16 | 24 | 32 | 48 | 64}

7. non-linear

8. echo cancel erl worst-case {6 | 3 | 0}

9. exit

DETAILED STEPS
Command or Action

Purpose

Step 1

enable
Example:

Router> enable

Enables higher privilege levels, such as privileged EXEC mode.

•Enter your password if prompted.

Step 2

configure {terminal}
Example:

Router# configure terminal

Enters global configuration mode.

Step 3

voice-port slot/port:ds0-group-no
Example:

Router(config)# voice-port 1/0:0

Enters voice-port configuration mode on the selected slot, port, and DS-0 group.

•Each defined DS-0 group number is represented on a separate voice port. This allows you to define individual DS-0s on the digital T1/E1 card.

Step 4

echo cancel enable
Example:

Router(config-voiceport)# echo cancel enable

Enables echo cancellation.

•The Cisco G.165 EC is enabled by default with echo suppression off.

The echo suppressor can be turned on only when the default Cisco G.165 EC is used. The echo suppressor command used with the default Cisco EC is still visible when the extended EC is selected, but it does not do anything.

Use the no form of this command to disable the EC.

Note For this command to work, the
echo cancel coverage command must also be configured.
Step 5
echo suppressor seconds
Example:

Router(config-voiceport)# echo suppressor
(Optional) Applies echo suppression for the number of seconds specified. S

•This command reduces the initial echo before the echo canceller can converge. In case of double-talk in the first number of seconds, the code automatically disables the suppressor.

Note The echo canceller must be enabled for this command to work.
Step 6

echo cancel coverage {8 | 16 | 24 | 32 | 48 | 64}
Example:

Router(config-voiceport)# echo cancel coverage 64

Adjusts the size of the echo canceller (echo path capacity coverage). This command enables cancellation of voice that is sent out the interface and received back on the same interface within the configured amount of time.

Note This command is valid only when the echo canceller feature has been enabled. See Step 4 above.

Step 7

non-linear
Example:

Router(config-voiceport)# non-linear

Selects nonlinear processing (residual echo suppression) in the EC, which either shuts off any signal or mixes in comfort noise if no near-end speech is detected.

Note Echo cancelling must be enabled for this feature to work. See Step 4 above.

•Nonlinear processing is enabled when the extended G.168 echo canceller is enabled. Use the no form of this command to disable the NLP.

•The Cisco G.165 EC is enabled by default with the echo suppressor turned off. The echo suppressor can be turned on only when using the default Cisco G.165 EC is used. See the echo suppressor command.

•The echo suppressor command used with the Cisco default EC is still visible when the extended EC is selected, but it does not do anything.

Step 8

echo-cancel erl worst-case [0 | 3 | 6]
Example:

Router# echo-cancel erl worst-case 6

Determines worst-case echo return loss (ERL) in decibels (dB).

•This command is enabled by default with the G.168 extended EC.

Step 9

exit
Example:

Router(config-voiceport)# exit

Exits voice-port configuration mode and completes the configuration.
Verifying Codec Complexity Settings

To verify the codec complexity and extended EC configuration, enter the show running-config command to display the current voice-card setting. If medium complexity is specified, the codec complexity setting is not displayed. If high complexity is specified, the "codec complexity high" setting is displayed.

The following example shows abbreviated command output if high complexity is specified on the Cisco MC3810:
Router# show running-config
.
.
.
hostname router-alpha 
voice-card 0
 codec complexity high ecan-extended
.
.
.
Verifying Analog and Digital Voice Port Configurations

After configuring the voice ports on your router, perform the following steps to verify proper operation.

Step 1 Pick up the handset of an attached telephony device and check for dial tone.

Step 2 If you have dial tone, check for dual-tone multifrequency (DTMF) detection. If dial tone stops when you dial a digit, the voice port most likely is configured properly.

Step 3 To identify port numbers of voice interfaces installed in your router, use the show voice port summary command. For examples of the output, refer to the "Show Voice Port Summary Samples" section of the Configuring Voice Ports document.

Step 4 To verify voice port parameter settings, enter the show voice port command. For sample output, refer to the "Show Voice Port Samples" section of the Configuring Voice Ports document.

Step 5 To display the active call information for voice calls or fax transmissions in progress, use the
show call active command. This command displays information about call times, dial peers, connections, quality of service, and other status and statistical information. The voice keyword displays all voice calls currently connected through the router or access server.

Configuration Examples for Enhanced ITU-T G.168 Echo Cancellation

This section contains the following configuration examples:

•Enabling the Echo Canceller Example

•Switching the Echo Canceller Example

•Enabling the Extended EC on the Cisco 1700 Series and Cisco ICS7750

•Changing Codec Complexity on the Cisco 7200 Series Example

•Adjusting the Echo Canceller Size Example

•Worst-Case Echo Return Loss Example

•Checking the Active Calls Example

Enabling the Echo Canceller Example

The following example enables extended echo cancellation and adjusts the size of the EC to 64 ms on a Cisco 3600 series router:
voice-port 1/0/0
 echo cancel enable
 echo cancel coverage 64
The following example enables extended echo cancellation and adjusts the size of the EC to 64 ms on a Cisco MC3810:
voice-port 1/1:0
 echo cancel enable
 echo cancel coverage 64
The following example enables the Enhanced ITU-T G.168 Echo Cancellation feature on a Cisco 1700 series or Cisco ICS 7750:
codec complexity medium
Switching the Echo Canceller Example

The following examples show that the default Cisco-proprietary EC has been switched to the extended EC. These examples show voice and POTS dial peers on originating and terminating router pairs running the maximum number of calls (23) on a single T1 interface.

The following is example show running config output from an originating Cisco 3640:
Router# show running config
!
version 12.2
service timestamps debug datetime msec
service timestamps log uptime
no service password-encryption
!
hostname 3640echo-135-hc
!
enable password xxx
!
voice-card 1
 codec complexity high ecan-extended
!
ip subnet-zero
!
ip domain-name cisco.com
ip host santa 172.16.1.0
ip name-server 172.16.0.0
!
frame-relay switching
isdn switch-type primary-5ess
isdn voice-call-failure 0
call rsvp-sync
!
controller T1 1/0
 framing esf
 linecode b8zs
 pri-group timeslots 1-24
!
controller T1 1/1
 framing sf
 linecode ami
!
interface Ethernet0/0
 ip address 172.16.0.1 255.0.0.0
 half-duplex
!
interface Serial0/0
 no ip address
 encapsulation frame-relay
 no ip route-cache
 no ip mroute-cache
 no keepalive
 no fair-queue
 clock rate 256000
 no arp frame-relay
 cdp enable
 frame-relay traffic-shaping
 frame-relay interface-dlci 100
  class fr200
  vofr cisco
 hold-queue 1024 out
!
interface Ethernet0/1
 ip address 10.1.0.103 255.0.0.0
 full-duplex
!
interface Serial1/0:23
 no ip address
 no logging event link-status
 isdn switch-type primary-5ess
 isdn incoming-voice voice
 no cdp enable
!
ip classless
ip route 10.2.0.0 255.0.0.0 e0/1
ip route 172.16.0.0 255.0.0.0 172.16.0.1
ip route 172.16.0.1.0 255.0.0.0 172.17.0.0
no ip http server
ip pim bidir-enable
!
map-class frame-relay fr200
 frame-relay traffic-rate 560000 560000
 no frame-relay adaptive-shaping
 frame-relay cir 100000
 frame-relay mincir 100000
 frame-relay fair-queue
 frame-relay voice bandwidth 560000
!
voice-port 1/0:23
!
voice-port 2/0/0
!
voice-port 2/0/1
!
voice-port 2/1/0
!
voice-port 2/1/1
!
voice-port 3/0/0
!
voice-port 3/0/1
!
dial-peer cor custom
!
dial-peer voice 104001 voip
 destination-pattern 104001
 session target ipv4:10.2.0.104
 dtmf-relay cisco-rtp
 codec g711alaw
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 104002 voip
 destination-pattern 104002
 session target ipv4:10.2.0.104
 dtmf-relay cisco-rtp
 codec g711ulaw
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 104003 voip
 destination-pattern 104003
 session target ipv4:10.2.0.104
 dtmf-relay cisco-rtp
 codec g726r16
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 104004 voip
 destination-pattern 104004
 session target ipv4:10.2.0.104
 dtmf-relay cisco-rtp
 codec g726r24
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 104005 voip
 destination-pattern 104005
 session target ipv4:10.2.0.104
 dtmf-relay h245-alphanumeric
 codec g726r32
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 104006 voip
 destination-pattern 104006
 session target ipv4:10.2.0.104
 dtmf-relay h245-alphanumeric
 codec g728
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 104007 voip
 destination-pattern 104007
 session target ipv4:10.2.0.104
 dtmf-relay h245-alphanumeric
 codec g729br8
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 104008 voip
 destination-pattern 104008
 session target ipv4:10.2.0.104
 dtmf-relay h245-alphanumeric
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 104009 voip
 destination-pattern 104009
 session target ipv4:10.2.0.104
 dtmf-relay h245-signal
 codec gsmefr
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 104010 voip
 destination-pattern 104010
 session target ipv4:10.2.0.104
 dtmf-relay h245-signal
 codec gsmfr
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 104011 voip
 destination-pattern 104011
 session target ipv4:10.2.0.104
 dtmf-relay h245-signal
 codec g723r53
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 104012 voip
 destination-pattern 104012
 session target ipv4:10.2.0.104
 dtmf-relay h245-signal
 codec g723r63
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 104101 vofr
 destination-pattern 104101
 session target Serial0/0 100
 dtmf-relay
 codec g726r16
 fax rate 14400
!
dial-peer voice 104102 vofr
 destination-pattern 104102
 session target Serial0/0 100
 dtmf-relay
 codec g726r24
 fax rate 14400
!
dial-peer voice 104103 vofr
 destination-pattern 104103
 session target Serial0/0 100
 dtmf-relay
 codec g726r32
 fax rate 14400
!
dial-peer voice 104104 vofr
 destination-pattern 104104
 session target Serial0/0 100
 dtmf-relay
 codec g728
 fax rate 14400
!
dial-peer voice 104105 vofr
 destination-pattern 104105
 session target Serial0/0 100
 dtmf-relay
 codec g729br8
 fax rate 14400
!
dial-peer voice 104106 vofr
 destination-pattern 104106
 session target Serial0/0 100
 dtmf-relay
 fax rate 14400
!
dial-peer voice 104107 vofr
 destination-pattern 104107
 session target Serial0/0 100
 dtmf-relay
 codec g723r53
 fax rate 14400
!
dial-peer voice 104108 vofr
 destination-pattern 104108
 session target Serial0/0 100
 dtmf-relay
 codec g723r63
 fax rate 14400
!
dial-peer voice 104109 vofr
 destination-pattern 104109
 session target Serial0/0 100
 dtmf-relay
 codec g723ar53
 fax rate 14400
!
dial-peer voice 104110 vofr
 destination-pattern 104110
 session target Serial0/0 100
 dtmf-relay
 codec g723ar63
 fax rate 14400
!
dial-peer voice 104111 vofr
 destination-pattern 104111
 session target Serial0/0 100
 dtmf-relay
 codec g711alaw
 fax rate 14400
!
dial-peer voice 104112 vofr
 destination-pattern 104112
 session target Serial0/0 100
 dtmf-relay
 codec g711ulaw
 fax rate 14400
!
dial-peer voice 2001 pots
 incoming called-number 5440001
 port 1/0:23
!
dial-peer voice 2002 pots
 incoming called-number 5440002
 port 1/0:23
!
dial-peer voice 2003 pots
 incoming called-number 5440003
 port 1/0:23
!
dial-peer voice 2004 pots
 incoming called-number 5440004
 port 1/0:23
!
dial-peer voice 2005 pots
 incoming called-number 5440005
 port 1/0:23
!
dial-peer voice 2006 pots
 incoming called-number 5440006
 port 1/0:23
!
dial-peer voice 2007 pots
 incoming called-number 5440007
 port 1/0:23
!
dial-peer voice 2008 pots
 incoming called-number 5440008
 port 1/0:23
!
dial-peer voice 2009 pots
 incoming called-number 5440009
 port 1/0:23
!
dial-peer voice 2010 pots
 incoming called-number 5440010
 port 1/0:23
!
dial-peer voice 2011 pots
 incoming called-number 5440011
 port 1/0:23
!
dial-peer voice 2012 pots
 incoming called-number 5440012
 port 1/0:23
!
dial-peer voice 2013 pots
 incoming called-number 5440013
 port 1/0:23
!
dial-peer voice 2014 pots
 incoming called-number 5440014
 port 1/0:23
!
dial-peer voice 2015 pots
 incoming called-number 5440015
 port 1/0:23
!
dial-peer voice 2016 pots
 incoming called-number 5440016
 port 1/0:23
!
dial-peer voice 2017 pots
 incoming called-number 5440017
 port 1/0:23
!
dial-peer voice 2018 pots
 incoming called-number 5440018
 port 1/0:23
!
dial-peer voice 2019 pots
 incoming called-number 5440019
 port 1/0:23
!
dial-peer voice 2020 pots
 incoming called-number 5440020
 port 1/0:23
!
dial-peer voice 2021 pots
 incoming called-number 5440021
 port 1/0:23
!
dial-peer voice 2022 pots
 incoming called-number 5440022
 port 1/0:23
!
dial-peer voice 2023 pots
 incoming called-number 5440023
 port 1/0:23
!
dial-peer voice 2024 pots
 incoming called-number 5440024
 port 1/0:23
!
dial-peer voice 104301 voip
 destination-pattern 5481320
 session target ipv4:10.2.0.104
 dtmf-relay cisco-rtp
 codec g711alaw
 fax rate 14400
!
dial-peer voice 104302 voip
 destination-pattern 5481321
 session target ipv4:10.2.0.104
 dtmf-relay cisco-rtp
 codec g711ulaw
 fax rate 14400
!
dial-peer voice 104303 voip
 destination-pattern 5481322
 session target ipv4:10.2.0.104
 dtmf-relay cisco-rtp
 codec g726r16
 fax rate 14400
!
dial-peer voice 104304 voip
 destination-pattern 5481323
 session target ipv4:10.2.0.104
 dtmf-relay cisco-rtp
 codec g726r24
 fax rate 14400
!
dial-peer voice 104305 voip
 destination-pattern 5481324
 session target ipv4:10.2.0.104
 dtmf-relay h245-alphanumeric
 codec g726r32
 fax rate 14400
!
dial-peer voice 104306 voip
 destination-pattern 5481325
 session target ipv4:10.2.0.104
 dtmf-relay h245-alphanumeric
 codec g728
 fax rate 14400
!
dial-peer voice 104307 voip
 destination-pattern 5481326
 session target ipv4:10.2.0.104
 dtmf-relay h245-alphanumeric
 codec g729br8
 fax rate 14400
!
dial-peer voice 104401 voip
 destination-pattern 5481420
 session target ipv4:10.2.0.104
 dtmf-relay h245-alphanumeric
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 104402 voip
 destination-pattern 5481421
 session target ipv4:10.2.0.104
 dtmf-relay h245-signal
 codec gsmefr
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 104403 voip
 destination-pattern 5481422
 session target ipv4:10.2.0.104
 dtmf-relay h245-signal
 codec gsmfr
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 104404 voip
 destination-pattern 5481423
 session target ipv4:10.2.0.104
 dtmf-relay h245-signal
 codec g723r53
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 104405 voip
 destination-pattern 5481424
 session target ipv4:10.2.0.104
 dtmf-relay h245-signal
 codec g723r63
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 104406 voip
 destination-pattern 5481425
 session target ipv4:10.2.0.104
 dtmf-relay cisco-rtp
 codec g723ar53
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 104407 voip
 destination-pattern 5481426
 session target ipv4:10.2.0.104
 dtmf-relay cisco-rtp
 codec g723ar63
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 104308 vofr
 destination-pattern 5481327
 session target Serial0/0 100
 dtmf-relay
 codec g711alaw
 fax rate 14400
!
dial-peer voice 104309 vofr
 destination-pattern 5481328
 session target Serial0/0 100
 dtmf-relay
 codec g711ulaw
fax rate 14400
!
dial-peer voice 104310 vofr
 destination-pattern 5481329
 session target Serial0/0 100
 dtmf-relay
 codec g726r16
 fax rate 14400
!
dial-peer voice 104311 vofr
 destination-pattern 5481330
 session target Serial0/0 100
 dtmf-relay
 codec g726r24
 fax rate 14400
!
dial-peer voice 104312 vofr
 destination-pattern 5481331
 session target Serial0/0 100
 dtmf-relay
 codec g726r32
 fax rate 14400
!
dial-peer voice 104313 vofr
 destination-pattern 5481332
 session target Serial0/0 100
 dtmf-relay
 codec g728
 fax rate 14400
!
dial-peer voice 104314 vofr
 destination-pattern 5481333
 session target Serial0/0 100
 dtmf-relay
 codec g729br8
 fax rate 14400
!
dial-peer voice 104408 vofr
 destination-pattern 5481427
 session target Serial0/0 100
 dtmf-relay
 fax rate 14400
!
dial-peer voice 104409 vofr
 destination-pattern 5481428
 session target Serial0/0 100
 dtmf-relay
 codec g729br8
 fax rate 14400
!
dial-peer voice 104410 vofr
 destination-pattern 5481429
 session target Serial0/0 100
 dtmf-relay
 fax rate 14400
!
dial-peer voice 104411 vofr
 destination-pattern 5481430
 session target Serial0/0 100
 dtmf-relay
 codec g723r53
 fax rate 14400
!
dial-peer voice 104412 vofr
 destination-pattern 5481431
 session target Serial0/0 100
 dtmf-relay
 codec g723r63
 fax rate 14400
!
dial-peer voice 104413 vofr
 destination-pattern 5481432
 session target Serial0/0 100
 dtmf-relay
 codec g723ar53
 fax rate 14400
!
dial-peer voice 104414 vofr
 destination-pattern 5481433
 session target Serial0/0 100
 dtmf-relay
 codec g723ar63
 fax rate 14400
!
dial-peer voice 135300 pots
 incoming called-number 54813..
 destination-pattern 135300
 port 3/0/0
!
dial-peer voice 135301 pots
 incoming called-number 54814..
 destination-pattern 135301
 port 3/0/1
!
line con 0
 exec-timeout 0 0
 timeout login response 0
line aux 0
line vty 0 4
 exec-timeout 0 0
 password lab
 login
!
end
The following is example show running config output from a terminating Cisco 3640:
version 12.2
service timestamps debug datetime msec
service timestamps log uptime
no service password-encryption
!
hostname 3640eb-139-hc
!
enable password lab
!
voice-card 1
 codec complexity high ecan-extended
!
ip subnet-zero
!
ip domain-name cisco.com
ip host santa 172.16.0.0
ip name-server 172.16.0.0
!
isdn switch-type primary-5ess
isdn voice-call-failure 0
call rsvp-sync
!
controller T1 1/0
 framing esf
 linecode b8zs
 pri-group timeslots 1-24
!
controller T1 1/1
 framing sf
 linecode ami
!
interface Ethernet0/0
 ip address 172.16.0.0 255.0.0.0
 half-duplex
!
interface Serial0/0
 bandwidth 2000000
 no ip address
 encapsulation frame-relay
 no ip route-cache
 no ip mroute-cache
 no keepalive
 no fair-queue
 frame-relay traffic-shaping
 frame-relay interface-dlci 100
  class fr200
  vofr cisco
 hold-queue 1024 out
!
interface Ethernet0/1
 ip address 10.2.0.104 255.0.0.0
 full-duplex
!
interface Serial1/0:23
 no ip address
 no logging event link-status
 isdn switch-type primary-5ess
 isdn incoming-voice modem
!
ip classless
ip route 10.1.0.0 255.0.0.0 e0/1
ip route 172.16.0.1 255.o.0.0 172.16.0.0
ip route 172.17.0.0.0 255.o.255.0 172.16.0.0
no ip http server
ip pim bidir-enable
!
map-class frame-relay fr200
 frame-relay traffic-rate 560000 560000
 no frame-relay adaptive-shaping
 frame-relay cir 100000
 frame-relay mincir 100000
 frame-relay fair-queue
 frame-relay voice bandwidth 560000
!
voice-port 1/0:23
!
voice-port 2/1/0
!
voice-port 2/1/1
!
voice-port 3/0/0
!
voice-port 3/0/1
!
voice-port 3/1/0
!
voice-port 3/1/1
!
dial-peer cor custom
!
!
!
dial-peer voice 104001 pots
 destination-pattern 104001
 port 1/0:23
 prefix 5500001
!
dial-peer voice 104002 pots
 destination-pattern 104002
 port 1/0:23
 prefix 5500002
!
dial-peer voice 104003 pots
 destination-pattern 104003
 port 1/0:23
 prefix 5500003
!
dial-peer voice 104004 pots
 destination-pattern 104004
 port 1/0:23
 prefix 5500004
!
dial-peer voice 104005 pots
 destination-pattern 104005
 port 1/0:23
 prefix 5500005
!
dial-peer voice 104006 pots
 destination-pattern 104006
 port 1/0:23
 prefix 5500006
!
dial-peer voice 104007 pots
 destination-pattern 104007
 port 1/0:23
 prefix 5500007
!
dial-peer voice 104008 pots
 destination-pattern 104008
 port 1/0:23
 prefix 5500008
!
dial-peer voice 104009 pots
 destination-pattern 104009
 port 1/0:23
 prefix 5500009
!
dial-peer voice 104010 pots
 destination-pattern 104010
 port 1/0:23
 prefix 5500010
!
dial-peer voice 104011 pots
 destination-pattern 104011
 port 1/0:23
 prefix 5500011
!
dial-peer voice 104012 pots
 destination-pattern 104012
 port 1/0:23
 prefix 5500012
!
dial-peer voice 104101 pots
 destination-pattern 104101
 port 1/0:23
 prefix 5500013
!
dial-peer voice 104102 pots
 destination-pattern 104102
 port 1/0:23
 prefix 5500014
!
dial-peer voice 104103 pots
 destination-pattern 104103
 port 1/0:23
 prefix 5500015
!
dial-peer voice 104104 pots
 destination-pattern 104104
 port 1/0:23
 prefix 5500016
!
dial-peer voice 104105 pots
 destination-pattern 104105
 port 1/0:23
 prefix 5500017
!
dial-peer voice 104106 pots
 destination-pattern 104106
 port 1/0:23
 prefix 5500018
!
dial-peer voice 104107 pots
 destination-pattern 104107
 port 1/0:23
 prefix 5500019
!
dial-peer voice 104108 pots
 destination-pattern 104108
 port 1/0:23
 prefix 5500020
!
dial-peer voice 104109 pots
 destination-pattern 104109
 port 1/0:23
 prefix 5500021
!
dial-peer voice 104110 pots
 destination-pattern 104110
 port 1/0:23
 prefix 5500022
!
dial-peer voice 104111 pots
 destination-pattern 104111
 port 1/0:23
 prefix 5500023
!
dial-peer voice 104112 pots
 destination-pattern 104112
 port 1/0:23
 prefix 5500024
!
dial-peer voice 104301 pots
 destination-pattern 5481320
 port 2/1/0
 prefix ,,5500001
!
dial-peer voice 104310 pots
 destination-pattern 5481329
 port 2/1/0
 prefix ,,5500005
!
dial-peer voice 104311 pots
 destination-pattern 5481330
 port 2/1/0
 prefix ,,5500007
!
dial-peer voice 103001 voip
 incoming called-number 104001
 destination-pattern 103001
 session target ipv4:10.1.0.103
 dtmf-relay cisco-rtp
 codec g711alaw
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 103002 voip
 incoming called-number 104002
 destination-pattern 103002
 session target ipv4:10.1.0.103
 dtmf-relay cisco-rtp
 codec g711ulaw
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 103003 voip
 incoming called-number 104003
 destination-pattern 103003
 session target ipv4:10.1.0.103
 dtmf-relay cisco-rtp
 codec g726r16
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 103004 voip
 incoming called-number 104004
 destination-pattern 103004
 session target ipv4:10.1.0.103
 dtmf-relay cisco-rtp
 codec g726r24
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 103005 voip
 incoming called-number 104005
 destination-pattern 103005
 session target ipv4:10.1.0.103
 dtmf-relay h245-alphanumeric
 codec g726r32
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 103006 voip
 incoming called-number 104006
 destination-pattern 103006
 session target ipv4:10.1.0.103
 dtmf-relay h245-alphanumeric
 codec g728
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 103007 voip
 incoming called-number 104007
 destination-pattern 103007
 session target ipv4:10.1.0.103
 dtmf-relay h245-alphanumeric
 codec g729br8
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 103008 voip
 incoming called-number 104008
 destination-pattern 103008
 session target ipv4:10.1.0.103
 dtmf-relay h245-alphanumeric
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 103009 voip
 incoming called-number 104009
 destination-pattern 103009
 session target ipv4:10.1.0.103
 dtmf-relay h245-signal
 codec gsmefr
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 103010 voip
 incoming called-number 104010
 destination-pattern 103010
 session target ipv4:10.1.0.103
 dtmf-relay h245-signal
 codec gsmfr
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 103011 voip
 incoming called-number 104011
 destination-pattern 103011
 session target ipv4:10.1.0.103
 dtmf-relay h245-signal
 codec g723r53
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 103012 voip
 incoming called-number 104012
 destination-pattern 103012
 session target ipv4:10.1.0.103
 dtmf-relay h245-signal
 codec g723r63
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 103101 vofr
 incoming called-number 104101
 destination-pattern 103101
 session target Serial0/0 100
 dtmf-relay
 codec g726r16
 fax rate 14400
!
dial-peer voice 103102 vofr
 incoming called-number 104102
 destination-pattern 103102
 session target Serial0/0 100
 dtmf-relay
 codec g726r24
 fax rate 14400
!
dial-peer voice 103103 vofr
 incoming called-number 104103
 destination-pattern 103103
 session target Serial0/0 100
 dtmf-relay
 codec g726r32
 fax rate 14400
!
dial-peer voice 103104 vofr
 incoming called-number 104104
 destination-pattern 103104
 session target Serial0/0 100
 dtmf-relay
 codec g728
 fax rate 14400
!
dial-peer voice 103105 vofr
 incoming called-number 104105
 destination-pattern 103105
 session target Serial0/0 100
 dtmf-relay
 codec g729br8
 fax rate 14400
!
dial-peer voice 103106 vofr
 incoming called-number 104106
 destination-pattern 103106
 session target Serial0/0 100
 dtmf-relay
 fax rate 14400
!
dial-peer voice 103107 vofr
 incoming called-number 104107
 destination-pattern 103107
 session target Serial0/0 100
 dtmf-relay
 codec g723r53
 fax rate 14400
!
dial-peer voice 103108 vofr
 incoming called-number 104108
 destination-pattern 103108
 session target Serial0/0 100
 dtmf-relay
 codec g723r63
 fax rate 14400
!
dial-peer voice 103109 vofr
 incoming called-number 104109
 destination-pattern 103109
 session target Serial0/0 100
 dtmf-relay
 codec g723ar53
 fax rate 14400
!
dial-peer voice 103110 vofr
 incoming called-number 104110
 destination-pattern 103110
 session target Serial0/0 100
 dtmf-relay
 codec g723ar63
 fax rate 14400
!
dial-peer voice 103111 vofr
 incoming called-number 104111
 destination-pattern 103111
 session target Serial0/0 100
 dtmf-relay
 codec g711alaw
 fax rate 14400
!
dial-peer voice 103112 vofr
 incoming called-number 104112
 destination-pattern 103112
 session target Serial0/0 100
 dtmf-relay
 codec g711ulaw
 fax rate 14400
!
dial-peer voice 104302 pots
 destination-pattern 5481321
 port 2/1/0
 prefix ,,5500003
!
dial-peer voice 104303 pots
 destination-pattern 5481322
 port 2/1/0
 prefix ,,5500005
!
dial-peer voice 104304 pots
 destination-pattern 5481323
 port 2/1/0
 prefix ,,5500007
!
dial-peer voice 104305 pots
 destination-pattern 5481324
 port 2/1/0
 prefix ,,5500009
!
dial-peer voice 104306 pots
 destination-pattern 5481325
 port 2/1/0
 prefix ,,5500011
!
dial-peer voice 104307 pots
 destination-pattern 5481326
 port 2/1/0
 prefix ,,5500013
!
dial-peer voice 104401 pots
 destination-pattern 5481420
 port 2/1/1
 prefix ,,5500002
!
dial-peer voice 104402 pots
 destination-pattern 5481421
 port 2/1/1
 prefix ,,5500004
!
dial-peer voice 104403 pots
 destination-pattern 5481422
 port 2/1/1
 prefix ,,5500006
!
dial-peer voice 104404 pots
 destination-pattern 5481423
 port 2/1/1
 prefix ,,5500008
!
dial-peer voice 104405 pots
 destination-pattern 5481424
 port 2/1/1
 prefix ,,5500010
!
dial-peer voice 104406 pots
 destination-pattern 5481425
 port 2/1/1
 prefix ,,5500012
!
dial-peer voice 104407 pots
 destination-pattern 5481426
 port 2/1/1
 prefix ,,5500014
!
dial-peer voice 104308 pots
 destination-pattern 5481327
 port 2/1/0
 prefix ,,5500001
!
dial-peer voice 104309 pots
 destination-pattern 5481328
 port 2/1/0
 prefix ,,5500003
!
dial-peer voice 104312 pots
 destination-pattern 5481331
 port 2/1/0
 prefix ,,5500009
!
dial-peer voice 104313 pots
 destination-pattern 5481332
 port 2/1/0
 prefix ,,5500011
!
dial-peer voice 104314 pots
 destination-pattern 5481333
 port 2/1/0
 prefix ,,5500013
!
dial-peer voice 104408 pots
 destination-pattern 5481427
 port 2/1/1
 prefix ,,5500002
!
dial-peer voice 104409 pots
 destination-pattern 5481428
 port 2/1/1
 prefix ,,5500004
!
dial-peer voice 104410 pots
 destination-pattern 5481429
 port 2/1/1
 prefix ,,5500006
!
dial-peer voice 104411 pots
 destination-pattern 5481430
 port 2/1/1
 prefix ,,5500008
!
dial-peer voice 104412 pots
 destination-pattern 5481431
 port 2/1/1
 prefix ,,5500010
!
dial-peer voice 104413 pots
 destination-pattern 5481432
 port 2/1/1
 prefix ,,5500012
!
dial-peer voice 104414 pots
 destination-pattern 5481433
 port 2/1/1
 prefix ,,5500014
!
dial-peer voice 103301 voip
 incoming called-number 5481320
 session target ipv4:10.1.0.103
 dtmf-relay cisco-rtp
 codec g711alaw
 fax rate 14400
!
dial-peer voice 103302 voip
 incoming called-number 5481321
 session target ipv4:10.1.0.103
 dtmf-relay cisco-rtp
 codec g711ulaw
 fax rate 14400
!
dial-peer voice 103303 voip
 incoming called-number 5481322
 session target ipv4:10.1.0.103
 dtmf-relay cisco-rtp
 codec g726r16
 fax rate 14400
!
dial-peer voice 103304 voip
 incoming called-number 5481323
 session target ipv4:10.1.0.103
 dtmf-relay cisco-rtp
 codec g726r24
 fax rate 14400
!
dial-peer voice 103305 voip
 incoming called-number 5481324
 session target ipv4:10.1.0.103
 dtmf-relay h245-alphanumeric
 codec g726r32
 fax rate 14400
!
dial-peer voice 103306 voip
 incoming called-number 5481325
 session target ipv4:10.1.0.103
 dtmf-relay h245-alphanumeric
 codec g728
 fax rate 14400
!
dial-peer voice 103307 voip
 incoming called-number 5481326
 session target ipv4:10.1.0.103
 dtmf-relay h245-alphanumeric
 codec g729br8
 fax rate 14400
!
dial-peer voice 103401 voip
 incoming called-number 5481420
 session target ipv4:10.1.0.103
 dtmf-relay h245-alphanumeric
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 103402 voip
 incoming called-number 5481421
 session target ipv4:10.1.0.103
 dtmf-relay h245-signal
 codec gsmefr
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 103403 voip
 incoming called-number 5481422
 session target ipv4:10.1.0.103
 dtmf-relay h245-signal
 codec gsmfr
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 103404 voip
 incoming called-number 5481423
 session target ipv4:10.1.0.103
 dtmf-relay h245-signal
 codec g723r53
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 103405 voip
 incoming called-number 5481424
 session target ipv4:10.1.0.103
 dtmf-relay h245-signal
 codec g723r63
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 103406 voip
 incoming called-number 5481425
 session target ipv4:10.1.0.103
 dtmf-relay cisco-rtp
 codec g723ar53
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 103407 voip
 incoming called-number 5481426
 session target ipv4:10.1.0.103
 dtmf-relay cisco-rtp
 codec g723ar63
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 103308 vofr
 incoming called-number 5481327
 session target Serial0/0 100
 dtmf-relay
 codec g711alaw
 fax rate 14400
!
dial-peer voice 103309 vofr
 incoming called-number 5481328
 session target Serial0/0 100
 dtmf-relay
 codec g711ulaw
 fax rate 14400
!
dial-peer voice 103310 vofr
 incoming called-number 5481329
 session target Serial0/0 100
 dtmf-relay
 codec g726r16
 fax rate 14400
!
dial-peer voice 103311 vofr
 incoming called-number 5481330
 session target Serial0/0 100
 dtmf-relay
 codec g726r24
 fax rate 14400
!
dial-peer voice 103312 vofr
 incoming called-number 5481331
 session target Serial0/0 100
 dtmf-relay
 codec g726r32
 fax rate 14400
!
dial-peer voice 103313 vofr
 incoming called-number 5481332
 session target Serial0/0 100
 dtmf-relay
 codec g728
 fax rate 14400
!
dial-peer voice 103314 vofr
 incoming called-number 5481333
 session target Serial0/0 100
 dtmf-relay
 codec g729br8
 fax rate 14400
!
dial-peer voice 103408 vofr
 incoming called-number 5481427
 session target Serial0/0 100
 dtmf-relay
 fax rate 14400
!
dial-peer voice 103409 vofr
 incoming called-number 5481428
 session target Serial0/0 100
 dtmf-relay
 fax rate 14400
!
dial-peer voice 103410 vofr
 incoming called-number 5481429
 session target Serial0/0 100
 dtmf-relay
 fax rate 14400
!
dial-peer voice 103411 vofr
 incoming called-number 5481430
 session target Serial0/0 100
 dtmf-relay
 codec g723r53
 fax rate 14400
!
dial-peer voice 103412 vofr
 incoming called-number 5481431
 session target Serial0/0 100
 dtmf-relay
 codec g723r63
 fax rate 14400
!
dial-peer voice 103413 vofr
 incoming called-number 5481432
 session target Serial0/0 100
 dtmf-relay
 codec g723ar53
 fax rate 14400
!
dial-peer voice 103414 vofr
 incoming called-number 5481433
 session target Serial0/0 100
 dtmf-relay
 codec g723ar63
 fax rate 14400
!
line con 0
 exec-timeout 0 0
line aux 0
line vty 0 4
 password lab
 login
!
end
The following is example show running config output from the originating Cisco MC3810:
Router# show running config
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname 3810eb-18-hc-atm
!
enable password lab
!
network-clock base-rate 56k
ip subnet-zero
ip domain-name cisco.com
ip host santa 172.16.0.0
ip name-server 172.16.0.0
ip name-server 172.16.0.0
!
frame-relay switching
isdn voice-call-failure 0
call rsvp-sync
!
voice service voatm 
 !
 session protocol aal2 
  cac master
!
no voice confirmation-tone
voice-card 0
 codec complexity high ecan-extended
!
controller T1 0
 mode atm
 framing esf
 clock source inter
 linecode b8zs
!
controller T1 1
 mode cas
 framing esf
 linecode b8zs
 ds0-group 0 timeslots 1 type e&m-wink-start
 ds0-group 1 timeslots 2 type e&m-wink-start
 ds0-group 2 timeslots 3 type e&m-wink-start
 ds0-group 3 timeslots 4 type e&m-wink-start
 ds0-group 4 timeslots 5 type e&m-wink-start
 ds0-group 5 timeslots 6 type e&m-wink-start
 ds0-group 6 timeslots 7 type e&m-wink-start
 ds0-group 7 timeslots 8 type e&m-wink-start
 ds0-group 8 timeslots 9 type e&m-wink-start
 ds0-group 9 timeslots 10 type e&m-wink-start
 ds0-group 10 timeslots 11 type e&m-wink-start
 ds0-group 11 timeslots 12 type e&m-wink-start
 ds0-group 12 timeslots 13 type e&m-wink-start
 ds0-group 13 timeslots 14 type e&m-wink-start
 ds0-group 14 timeslots 15 type e&m-wink-start
 ds0-group 15 timeslots 16 type e&m-wink-start
 ds0-group 16 timeslots 17 type e&m-wink-start
 ds0-group 17 timeslots 18 type e&m-wink-start
 ds0-group 18 timeslots 19 type e&m-wink-start
 ds0-group 19 timeslots 20 type e&m-wink-start
 ds0-group 20 timeslots 21 type e&m-wink-start
 ds0-group 21 timeslots 22 type e&m-wink-start
 ds0-group 22 timeslots 23 type e&m-wink-start
 ds0-group 23 timeslots 24 type e&m-wink-start
!
process-max-time 100
!
interface Ethernet0
 ip address 172.16.0.0 255.0.0.0
 no ip route-cache
 no ip mroute-cache
!
interface Serial0
 no ip address
 encapsulation frame-relay
 no ip route-cache
 no ip mroute-cache
 no keepalive
 no fair-queue
 clockrate 250000
 no arp frame-relay
 cdp enable
 frame-relay traffic-shaping
 frame-relay interface-dlci 100
  class fr200
  vofr cisco
 frame-relay intf-type dce
 hold-queue 1024 out
!
interface Serial1
 no ip address
 no ip route-cache
 no ip mroute-cache
 shutdown
 no cdp enable
!
interface ATM0
 no ip address
 no atm ilmi-keepalive
 pvc 1/100 
  vbr-rt 1536 1536 65535
  encapsulation aal2
 !
interface FR-ATM20
 no ip address
 no ip route-cache
 shutdown
!
ip classless
ip route 0.0.0.0 0.0.0.0 172.16.0.1
no ip http server
!
!
map-class frame-relay fr200
 frame-relay voice bandwidth 560000
 frame-relay traffic-rate 560000 560000
 no frame-relay adaptive-shaping
 frame-relay cir 100000
 frame-relay mincir 100000
 frame-relay fair-queue
!
voice-port 1:0
!
voice-port 1:1
!
voice-port 1:2
!
voice-port 1:3
!
voice-port 1:4
!
voice-port 1:5
!
voice-port 1:6
!
voice-port 1:7
!
voice-port 1:8
!
voice-port 1:9
!
voice-port 1:10
!
voice-port 1:11
!
voice-port 1:12
!
voice-port 1:13
!
voice-port 1:14
!
voice-port 1:15
!
voice-port 1:16
 timeouts wait-release 3
 connection trunk 1917
!
voice-port 1:17
 timeouts wait-release 3
 connection trunk 1918
!
voice-port 1:18
 timeouts wait-release 3
 connection trunk 1919
!
voice-port 1:19
 timeouts wait-release 3
 connection trunk 1920
!
voice-port 1:20
 vad
!
voice-port 1:21
 vad
!
voice-port 1:22
 vad
!
voice-port 1:23
 vad
!
dial-peer cor custom
!
dial-peer voice 19001 voip
 destination-pattern 5430001
 session target ipv4:172.16.0.0
 dtmf-relay cisco-rtp
 codec g711alaw
 fax rate 14400
!
dial-peer voice 19002 voip
 destination-pattern 5430002
 session target ipv4:172.16.0.0
 dtmf-relay cisco-rtp
 codec g726r16
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 19003 voip
 destination-pattern 5430003
 session target ipv4:172.16.0.0
 dtmf-relay cisco-rtp
 codec g711ulaw
 fax rate 14400
!
dial-peer voice 19004 voip
 destination-pattern 5430004
 session target ipv4:172.16.0.0
 dtmf-relay cisco-rtp
 codec g728
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 19005 voip
 destination-pattern 5430005
 session target ipv4:172.16.0.0
 dtmf-relay h245-alphanumeric
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 19006 voip
 destination-pattern 5430006
 session target ipv4:172.16.0.0
 dtmf-relay h245-alphanumeric
 codec g723ar53
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 19007 voip
 destination-pattern 5430007
 session target ipv4:172.16.0.0
 dtmf-relay h245-signal
 codec g729br8
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 19008 voip
 destination-pattern 5430008
 session target ipv4:172.16.0.0
 dtmf-relay h245-signal
 codec g726r32
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 19009 vofr
 destination-pattern 5430009
 session target Serial0 100
 dtmf-relay
 codec g726r16
 fax rate 14400 
!
dial-peer voice 19010 vofr
 destination-pattern 5430010
 session target Serial0 100
 dtmf-relay
 codec g723ar63
 fax rate 14400
!
dial-peer voice 19011 vofr
 destination-pattern 5430011
 session target Serial0 100
 dtmf-relay
 codec g723r53
 fax rate 14400
!
dial-peer voice 19012 vofr
 destination-pattern 5430012
 session target Serial0 100
 dtmf-relay
 codec g723r63
 fax rate 14400
!
dial-peer voice 19101 vofr
 destination-pattern 5430013
 session target Serial0 100
 dtmf-relay
 codec g726r16
 fax rate 14400 
!
dial-peer voice 19102 vofr
 destination-pattern 5430014
 session target Serial0 100
 dtmf-relay
 codec g726r24
 fax rate 14400 
!
dial-peer voice 19103 vofr
 destination-pattern 5430015
 session target Serial0 100
 dtmf-relay
 codec g726r32
 fax rate 14400
!
dial-peer voice 19104 vofr
 destination-pattern 5430016
 session target Serial0 100
 dtmf-relay
 codec g728
 fax rate 14400
!
dial-peer voice 19105 voatm
 destination-pattern 1917
 session protocol aal2-trunk
 session target ATM0 pvc 1/100 20
 codec aal2-profile ITUT 1 g711ulaw
 dtmf-relay
!
dial-peer voice 19106 voatm
 destination-pattern 1918
 session protocol aal2-trunk
 session target ATM0 pvc 1/100 21
 dtmf-relay
 codec aal2-profile custom 110 g726r32
!
dial-peer voice 19107 voatm
 destination-pattern 1919
 session protocol aal2-trunk
 session target ATM0 pvc 1/100 22
 codec aal2-profile ITUT 1 g711ulaw
 dtmf-relay
!
dial-peer voice 19108 voatm
 destination-pattern 1920
 session protocol aal2-trunk
 session target ATM0 pvc 1/100 23
 dtmf-relay
 codec aal2-profile custom 110 g729br8
!
dial-peer voice 19109 voip
 destination-pattern 5430021
 session target ipv4:172.16.0.0
 codec g723r53
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 19110 voip
 destination-pattern 5430022
 session target ipv4:172.16.0.0
 codec g723r63
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 19111 voip
 destination-pattern 5430023
 session target ipv4:172.16.0.0
 codec g711alaw
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 19112 voip
 destination-pattern 5430024
 session target ipv4:172.16.0.0
 codec g711ulaw
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 18001 pots
 destination-pattern 5420001
 port 1:0
!
dial-peer voice 18002 pots
 destination-pattern 5420002
 port 1:1
!
dial-peer voice 18003 pots
 destination-pattern 5420003
 port 1:2
!
dial-peer voice 18004 pots
 destination-pattern 5420004
 port 1:3
!
dial-peer voice 18005 pots
 destination-pattern 5420005
 port 1:4
!
dial-peer voice 18006 pots
 destination-pattern 5420006
 port 1:5
!
dial-peer voice 18007 pots
 destination-pattern 5420007
 port 1:6
!
dial-peer voice 18008 pots
 destination-pattern 5420008
 port 1:7
!
dial-peer voice 18009 pots
 destination-pattern 5420009
 port 1:8
!
dial-peer voice 18010 pots
 destination-pattern 5420010
 port 1:9
!
dial-peer voice 18011 pots
 destination-pattern 5420011
 port 1:10
!
dial-peer voice 18012 pots
 destination-pattern 5420012
 port 1:11
!
dial-peer voice 18101 pots
 destination-pattern 5420013
 port 1:12
!
dial-peer voice 18102 pots
 destination-pattern 5420014
 port 1:13
!
dial-peer voice 18103 pots
 destination-pattern 5420015
 port 1:14
!
dial-peer voice 18104 pots
 destination-pattern 5420016
 port 1:15
!
dial-peer voice 1817 pots
 destination-pattern 1817
 port 1:16
!
dial-peer voice 1818 pots
 destination-pattern 1818
 port 1:17
!
dial-peer voice 1819 pots
 destination-pattern 1819
 port 1:18
!
dial-peer voice 1820 pots
 destination-pattern 1820
 port 1:19
!
!
line con 0
 exec-timeout 0 0
line aux 0
line 2 3
line vty 0 4
 password lab
 login
!
end
The following is example show running config output from the terminating Cisco MC3810:
Router# show running config
!
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname 3810eb-19-hc-atm
!
enable password lab
!
network-clock base-rate 56k
ip subnet-zero
ip domain-name cisco.com
ip host santa 172.16.0.0
ip name-server 172.16.0.1
ip name-server 172.16.0.2
!
isdn voice-call-failure 0
call rsvp-sync
!
no voice confirmation-tone
voice-card 0
 codec complexity high ecan-extended
!
controller T1 0
 mode atm
 framing esf
 clock source loop-timed
 linecode b8zs
!
controller T1 1
 mode cas
 framing esf
 linecode b8zs
 ds0-group 0 timeslots 1 type e&m-wink-start
 ds0-group 1 timeslots 2 type e&m-wink-start
 ds0-group 2 timeslots 3 type e&m-wink-start
 ds0-group 3 timeslots 4 type e&m-wink-start
 ds0-group 4 timeslots 5 type e&m-wink-start
 ds0-group 5 timeslots 6 type e&m-wink-start
 ds0-group 6 timeslots 7 type e&m-wink-start
 ds0-group 7 timeslots 8 type e&m-wink-start
 ds0-group 8 timeslots 9 type e&m-wink-start
 ds0-group 9 timeslots 10 type e&m-wink-start
 ds0-group 10 timeslots 11 type e&m-wink-start
 ds0-group 11 timeslots 12 type e&m-wink-start
 ds0-group 12 timeslots 13 type e&m-wink-start
 ds0-group 13 timeslots 14 type e&m-wink-start
 ds0-group 14 timeslots 15 type e&m-wink-start
 ds0-group 15 timeslots 16 type e&m-wink-start
 ds0-group 16 timeslots 17 type e&m-wink-start
 ds0-group 17 timeslots 18 type e&m-wink-start
 ds0-group 18 timeslots 19 type e&m-wink-start
 ds0-group 19 timeslots 20 type e&m-wink-start
 ds0-group 20 timeslots 21 type e&m-wink-start
 ds0-group 21 timeslots 22 type e&m-wink-start
 ds0-group 22 timeslots 23 type e&m-wink-start
 ds0-group 23 timeslots 24 type e&m-wink-start
!
interface Ethernet0
 ip address 172.29.251.19 255.255.255.0
 no ip route-cache
 no ip mroute-cache
!
interface Serial0
 bandwidth 2000000
 no ip address
 encapsulation frame-relay
 no ip route-cache
 no ip mroute-cache
 no keepalive
 frame-relay traffic-shaping
 frame-relay interface-dlci 100
  class fr200
  vofr cisco
 hold-queue 1024 out
!
interface Serial1
 no ip address
 no ip route-cache
 no ip mroute-cache
 shutdown
 no cdp enable
!
interface ATM0
 no ip address
 no atm ilmi-keepalive
 pvc 1/100 
  vbr-rt 1536 1536 65535
  encapsulation aal2
 !
interface FR-ATM20
 no ip address
 no ip route-cache
 shutdown
!
ip classless
ip route 0.0.0.0 0.0.0.0 172.16.0.0
no ip http server
!
!
map-class frame-relay fr200
 frame-relay voice bandwidth 500000
 frame-relay fragment 80
 frame-relay traffic-rate 512000 1500000
 no frame-relay adaptive-shaping
 frame-relay cir 100000
 frame-relay mincir 100000
 frame-relay fair-queue
!
voice-port 1:0
!
voice-port 1:1
!
voice-port 1:2
!
voice-port 1:3
!
voice-port 1:4
!
voice-port 1:5
!
voice-port 1:6
!
voice-port 1:7
!
voice-port 1:8
!
voice-port 1:9
!
voice-port 1:10
!
voice-port 1:11
!
voice-port 1:12
!
voice-port 1:13
!
voice-port 1:14
!
voice-port 1:15
!
voice-port 1:16
 timeouts wait-release 3
 connection trunk 1817
!
voice-port 1:17
 timeouts wait-release 3
 connection trunk 1818
!
voice-port 1:18
 timeouts wait-release 3
 connection trunk 1819
!
voice-port 1:19
 timeouts wait-release 3
 connection trunk 1820
!
voice-port 1:20
!
voice-port 1:21
!
voice-port 1:22
!
voice-port 1:23
!
dial-peer cor custom
!
dial-peer voice 19001 pots
 destination-pattern 5430001
 port 1:0
 prefix ,,,5500001
!
dial-peer voice 19002 pots
 destination-pattern 5430002
 port 1:1
 prefix ,,,5500002
!
dial-peer voice 19003 pots
 destination-pattern 5430003
 port 1:2
 prefix ,,,5500003
!
dial-peer voice 19004 pots
 destination-pattern 5430004
 port 1:3
 prefix ,,,5500004
!
dial-peer voice 19005 pots
 destination-pattern 5430005
 port 1:4
 prefix ,,,5500005
!
dial-peer voice 19006 pots
 destination-pattern 5430006
 port 1:5
 prefix ,,,5500006
!
dial-peer voice 19007 pots
 destination-pattern 5430007
 port 1:6
 prefix ,,,5500007
!
dial-peer voice 19008 pots
 destination-pattern 5430008
 port 1:7
 prefix ,,,5500008
!
dial-peer voice 19009 pots
 destination-pattern 5430009
 port 1:8
 prefix ,,,5500009
!
dial-peer voice 19010 pots
 destination-pattern 5430010
 port 1:9
 prefix ,,,5500010
!
dial-peer voice 19011 pots
 destination-pattern 5430011
 port 1:10
 prefix ,,,5500011
!
dial-peer voice 19012 pots
 destination-pattern 5430012
 port 1:11
 prefix ,,,5500012
!
dial-peer voice 19101 pots
 destination-pattern 5430013
 port 1:12
 prefix ,,,5500013
!
dial-peer voice 19102 pots
 destination-pattern 5430014
 port 1:13
 prefix ,,,5500014
!
dial-peer voice 19103 pots
 destination-pattern 5430015
 port 1:14
 prefix ,,,5500015
!
dial-peer voice 19104 pots
 destination-pattern 5430016
 port 1:15
 prefix ,,,5500016
!
dial-peer voice 19105 pots
 destination-pattern 5430017
 port 1:16
 prefix ,,,5500017
!
dial-peer voice 19106 pots
 destination-pattern 5430018
 port 1:17
 prefix ,,,5500018
!
dial-peer voice 19107 pots
 destination-pattern 5430019
 port 1:18
 prefix ,,,5500019
!
dial-peer voice 19108 pots
 destination-pattern 5430020
 port 1:19
 prefix ,,,5500020
!
dial-peer voice 19109 pots
 destination-pattern 5430021
 port 1:20
 prefix ,,,5500021
!
dial-peer voice 19110 pots
 destination-pattern 5430022
 port 1:21
 prefix ,,,5500022
!
dial-peer voice 19111 pots
 destination-pattern 5430023
 port 1:22
 prefix ,,,5500023
!
dial-peer voice 19112 pots
 destination-pattern 5430024
 port 1:23
 prefix ,,,5500024
!
dial-peer voice 8888 pots
 destination-pattern 8888
!
dial-peer voice 18009 vofr
 incoming called-number 5430009
 destination-pattern 5420009
 session target Serial0 100
 dtmf-relay
 codec g726r16
 fax rate 14400
!
dial-peer voice 18010 vofr
 incoming called-number 5430010
 destination-pattern 5420010
 session target Serial0 100
 dtmf-relay
 codec g723ar63
 fax rate 14400
!
dial-peer voice 18011 vofr
 incoming called-number 5430011
 destination-pattern 5420011
 session target Serial0 100
 dtmf-relay
 codec g723r53
 fax rate 14400
!
dial-peer voice 18012 vofr
 incoming called-number 5430012
 destination-pattern 5420012
 session target Serial0 100
 dtmf-relay
 codec g723r63
 fax rate 14400
!
dial-peer voice 18001 voip
 incoming called-number 5430001
 destination-pattern 5420001
 session target ipv4:172.16.0.0
 dtmf-relay cisco-rtp
 codec g711alaw
 fax rate 14400
!
dial-peer voice 18002 voip
 incoming called-number 5430002
 destination-pattern 5420002
 session target ipv4:172.16.0.0
 dtmf-relay cisco-rtp
 codec g726r16
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 18003 voip
 incoming called-number 5430003
 destination-pattern 5420003
 session target ipv4:172.16.0.0
 dtmf-relay cisco-rtp
 codec g711ulaw
 fax rate 14400
!
dial-peer voice 18004 voip
 incoming called-number 5430004
 destination-pattern 5420004
 session target ipv4:172.16.0.0
 dtmf-relay cisco-rtp
 codec g728
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 18005 voip
 incoming called-number 5430005
 destination-pattern 5420005
 session target ipv4:172.16.0.0
 dtmf-relay h245-alphanumeric
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 18006 voip
 incoming called-number 5430006
 destination-pattern 5420006
 session target ipv4:172.16.0.0
 dtmf-relay h245-alphanumeric
 codec g723ar53
 fax rate 14400
 fax protocol t38 ls-redundancy 0 hs-redundancy 0
!
dial-peer voice 18007 voip
 incoming called-number 5430007
 destination-pattern 5420007
 session target ipv4:172.16.0.0
 dtmf-relay h245-signal
 codec g729br8
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 18008 voip
 incoming called-number 5430008
 destination-pattern 5420008
 session target ipv4:172.16.0.0
 dtmf-relay h245-signal
 codec g726r32
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 18101 vofr
 incoming called-number 5430013
 destination-pattern 5420013
 session target Serial0 100
 dtmf-relay
 codec g726r16
 fax rate 14400
!
dial-peer voice 18102 vofr
 incoming called-number 5430014
 destination-pattern 5420014
 session target Serial0 100
 dtmf-relay
 codec g726r24
 fax rate 14400
!
dial-peer voice 18103 vofr
 incoming called-number 5430015
 destination-pattern 5420015
 session target Serial0 100
 dtmf-relay
 codec g726r32
 fax rate 14400
!
dial-peer voice 18104 vofr
 incoming called-number 5430016
 destination-pattern 5420016
 session target Serial0 100
 dtmf-relay
 codec g728
 fax rate 14400
!
dial-peer voice 18109 voip
 incoming called-number 5430021
 destination-pattern 5420021
 session target ipv4:172.29.251.18
 codec g723r53
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 18110 voip
 incoming called-number 5430022
 destination-pattern 5420022
 session target ipv4:172.29.251.18
 codec g723r63
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 18111 voip
 incoming called-number 5430023
 destination-pattern 5420023
 session target ipv4:172.29.251.18
 codec g711alaw
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 18112 voip
 incoming called-number 5430024
 destination-pattern 5420024
 session target ipv4:172.16.0.0
 codec g711ulaw
 fax rate 14400
 fax protocol cisco
!
dial-peer voice 18105 voatm
 incoming called-number 1917
 destination-pattern 1817
 session protocol aal2-trunk
  dtmf-relay
 session target ATM0 pvc 1/100 20
 codec aal2-profile ITUT 1 g711ulaw
!
dial-peer voice 18106 voatm
 incoming called-number 1918
 destination-pattern 1818
 session protocol aal2-trunk
 session target ATM0 pvc 1/100 21
 dtmf-relay
 codec aal2-profile custom 110 g726r32
!
dial-peer voice 18107 voatm
 incoming called-number 1919
 destination-pattern 1819
 session protocol aal2-trunk
 session target ATM0 pvc 1/100 22
 codec aal2-profile ITUT 1 g711ulaw
 dtmf-relay
 !
dial-peer voice 18108 voatm
 incoming called-number 1920
 destination-pattern 1820
 session protocol aal2-trunk
 session target ATM0 pvc 1/100 23
 dtmf-relay
 codec aal2-profile custom 110 g729br8
!
line con 0
 exec-timeout 0 0
line aux 0
line 2 3
line vty 0 4
 password lab
 login
!
end
Enabling the Extended EC on the Cisco 1700 Series and Cisco ICS 7750 Example

The following example enables the G.168 extended EC on a Cisco 1700 series or a Cisco ICS7750. The extended EC is enabled by default when the medium keyword is used.
Router(config)# codec complexity medium
Changing Codec Complexity on the Cisco 7200 Series Example

The following example changes codec complexity on a Cisco 7200 series:
Router# configure terminal
Router(config)# dspint dspfarm 2/0
Router(config-dspfarm)# codec medium ecan-extended
Adjusting the Echo Canceller Size Example

The following example adjusts the size of the extended EC to 64 ms on Cisco 3600 series routers:
voice-port 1/0:0
echo-cancel enable
echo-cancel coverage 64
Worst-Case Echo Return Loss Example

The following example checks worst-case echo return loss configuration:
Router# show running-config
show run | begin voice-port
voice-port 0:D
echo-canceller erl worst-case 3
playout-delay mode fixed
no comfort-noise
!
Checking the Active Calls Example

The following is sample output from the show call active voice command. Important fields are highlighted in bold. (See the show call active command in the "Command Reference" section for descriptions of the field names and values in the output.)
Router# show call active voice 
Total call-legs:2 
SetupTime=7587246 ms 
Index=1 
PeerAddress= 
PeerSubAddress= 
PeerId=0 
PeerIfIndex=0 
LogicalIfIndex=0 
ConnectTime=7587506 
CallDuration=00:00:11 
CallState=4 
CallOrigin=2 
ChargedUnits=0 
InfoType=2 
TransmitPackets=101 
TransmitBytes=1991 
ReceivePackets=550 
ReceiveBytes=11000 
VOIP:
ConnectionId[0x7F8D82A4 0x928E11D5 0x8094FCFB 0x1C38F0FA] 
IncomingConnectionId[0x7F8D82A4 0x928E11D5 0x8094FCFB 0x1C38F0FA] 
RemoteIPAddress=172.29.248.111 
RemoteUDPPort=17394 
RoundTripDelay=4 ms 
SelectedQoS=best-effort 
tx_DtmfRelay=inband-voice 
FastConnect=TRUE 
AnnexE=FALSE 
Separate H245 Connection=FALSE 
H245 Tunneling=FALSE 
SessionProtocol=cisco 
SessionTarget= 
OnTimeRvPlayout=10300 
GapFillWithSilence=0 ms 
GapFillWithPrediction=0 ms 
GapFillWithInterpolation=0 ms 
GapFillWithRedundancy=0 ms 
HiWaterPlayoutDelay=70 ms 
LoWaterPlayoutDelay=69 ms 
ReceiveDelay=69 ms 
LostPackets=0 
EarlyPackets=0 
LatePackets=0 
VAD = enabled 
CoderTypeRate=g729r8 
CodecBytes=20 
SignalingType=ext-signal 
CallerName= 
CallerIDBlocked=False 
 GENERIC:
SetupTime=7587246 ms 
Index=2 
PeerAddress=133001 
PeerSubAddress= 
PeerId=133001 
PeerIfIndex=8 
LogicalIfIndex=7 
ConnectTime=7587505 
CallDuration=00:00:56 
CallState=4 
CallOrigin=1 
ChargedUnits=0 
InfoType=2 
TransmitPackets=2801 
TransmitBytes=56020 
ReceivePackets=162 
ReceiveBytes=3192 
TELE:
ConnectionId=[0x7F8D82A4 0x928E11D5 0x8094FCFB 0x1C38F0FA] 
IncomingConnectionId=[0x7F8D82A4 0x928E11D5 0x8094FCFB 0x1C38F0FA] 
TxDuration=56030 ms 
VoiceTxDuration=3210 ms 
FaxTxDuration=0 ms 
CoderTypeRate=g729r8 
NoiseLevel=-44 
ACOMLevel=-13 
OutSignalLevel=-45 
InSignalLevel=-45 
InfoActivity=2 
ERLLevel=7 
EchoCancellerMaxReflector=64 
SessionTarget= 
ImgPages=0 
CallerName= 
CallerIDBlocked=False 
Additional References

For additional information related to the Enhanced ITU-T G.168 Echo Cancellation feature, see the following sections:

•Related Documents

•RFCs

•Standards

•MIBs

•Technical Assistance

Related Documents

Related Topic

Document Title

Cisco 1700 series routers

Cisco 1700 series routers documentation index

Cisco 2600 series routers

Cisco 2600 series routers documentation index

Cisco 2600 series hardware

Cisco 2600 Series Multiservice Platforms

Cisco 3600 series routers

Cisco 3600 series routers documentation index

Cisco 3600 series hardware

Cisco 3600 Series Multiservice Platforms

Cisco 3700 series routers

Cisco 3700 series routers documentation index

Cisco 7200 series routers

Cisco 7200 Series

Cisco 7500 series routers

Cisco 7500 Series Routers

How to configure your Cisco router or access server to support voice, video, and fax applications

Cisco IOS Voice, Video, and Fax Configuration Guide, Release 12.2T

How to use Cisco IOS commands to support voice, video, and fax applications

Cisco IOS Voice, Video, and Fax Command Reference, Release 12.2T

Cisco VG200

Cisco Voice Gateway 200 (VG200) release notes index

How to configure voice ports

Configuring Voice Ports, Cisco IOS Release 12.2

Cisco IOS software configuration

Configuration guides and command references, Cisco IOS Release 12.2T

Cisco IOS Release 12.2

Release notes index, Cisco IOS Release 12.2T

Echo analysis.

Echo Analysis for Voice over IP

Technical information organized by hardware products

Hardware Support

Cisco MC3810

Multiservice Access Concentrators documentation index

Configuration of VoIP on Cisco 2600 and Cisco 3600 series routers

Voice over IP for the Cisco 2600 and Cisco 3600 series routers documentation index

RFCs

RFCs

Title

No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.

—

Standards

Standards¹

Title

•ITU-T G.164

Echo Suppressors

•ITU-T G.165

Echo Cancellers

•ITU-T G.168 (04/2000)

Digital Network Echo Cancellers

¹Not all supported standards are listed.

MIBs

MIBs¹

MIBs Link

•CISCO-VOICE-IF-MIB

•CISCO-VOICE-DIAL-CONTROL-MIB

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

¹Not all supported MIBs are listed.

Technical Assistance

Description

Link

Technical Assistance Center (TAC) home page, containing 30,000 pages of searchable technical content, including links to products, technologies, solutions, technical tips, tools, and lots more. Registered Cisco.com users can log in from this page to access even more content.

http://www.cisco.com/public/support/tac/home.shtml

Command Reference

This section documents new and modified commands. All other commands used with this feature are documented in the Cisco IOS Release 12.2T command reference publications.

Obsolete and Replaced Commands

Table 2 lists those commands that have been replaced since Cisco IOS Release 12.2(13)T.

Table 2 Replaced Extended Echo Canceller Commands

Command in Cisco IOS Release 12.2(13)ZH

Replacement Command in Cisco IOS Release 12.2(13)ZH

voice echo-canceller extended

Obsolete for the Cisco 1700 series and the Cisco ICS 7750.

New Commands

•echo-cancel erl worst-case

•echo suppressor

•test call id

Modified Commands

•codec complexity

•comfort-noise

•destination-pattern

•dial-peer voice

•ds0-group

•dspint dspfarm

•echo cancel coverage

•echo cancel enable

•non-linear

•port (dial peer)

•prefix

•show call active

•show voice call

•voice-card

•voice-port

codec complexity

To match the digital signal processor (DSP) complexity packaging to the codecs to be supported, use the codec complexity command in voice-card configuration mode. To reset to the default value, use the no form of this command.

codec complexity {high | medium} [ecan-extended]
no codec complexity
Syntax Description

high

High-complexity packaging. The high keyword selects a higher codec complexity if that is required to support a particular codec or combination of codecs.

Each DSP supports two voice channels encoded in any of the following formats:

•g711alaw—G.711 a-law 64,000 bps

•g711ulaw—G.711 u-law 64,000 bps

•g723ar53—G.723.1 Annex A 5300 bps

•g723ar63—G.723.1 Annex A 6300 bps

•g723r53—G.723.1 5300 bps

•g723r63—G.723.1 6300 bps

•g723r16—G.726 16,000 bps

•g726r24—G726 24,000 bps

•g726r32—G.726 32,000 bps

•g728—G.728 16,000 bps

•g729r8—G.729 8000 bps (default)

•g729br8—G.729 Annex B 8000 bps

•fax relay—2400 bps, 4800 bps, 7200 bps, 9600 bps, 12 kbps, and 14.4 kbps

Note Codecs G.723.1 and G.728 are not supported on Cisco 1750 and Cisco 1751 for Cisco Hoot and Holler over IP applications.

medium

Medium-complexity packaging. The medium keyword selects a lower codec complexity to support the greatest number of voice channels, provided that the lower complexity is compatible with the particular codecs in use.

Each DSP supports four voice channels encoded in any of the following formats:

•g711alaw—G.711 a-law 64,000 bps

•g711ulaw—G.711 u-law 64,000 bps

•g726r16—G.726 16,000 bps

•g726r24—G.726 24,000 bps

•g726r32—G.726 32,000 bps

•g729r8—G.729 Annex A 8000 bps

•G729br8—G.729 Annex B with Annex A 8000 bps

•fax relay—(default) 2400 bps, 4800 bps, 7200 bps, 9600 bps, 12 kbps, and 14.4 kbps

ecan-extended

(Optional) Selects the extended echo canceller. Use this keyword when either the codec complexity high or the codec complexity medium options are chosen. The default option is to use the Cisco proprietary G.165-compliant echo canceller (EC).

Defaults

Medium-complexity codecs

Command Modes

Voice-card configuration

Command History

Release

Modification

12.0(5)XK

This command was introduced on the Cisco 2600 series and Cisco 3600 series.

12.0(7)T

This command was integrated into Cisco IOS Release 12.0(7)T.

12.0(7)XK

This command was implemented on the Cisco MC3810 for use with the high-performance compression module (HCM).

12.1(2)T

This command was integrated into Cisco IOS Release 12.1(2)T.

12.2(8)T

This command was implemented on the Cisco 1750 and Cisco 1751.

12.2(13)T

The ecan-extended keyword was added.

12.2(13)ZH

The extended G.168 EC is the default on the Cisco 1700 series and the Cisco 7750 when the medium keyword is used. The ecan-extended keyword is not used on these platforms.

Usage Guidelines

Codec complexity refers to the amount of processing required to perform voice compression. Codec complexity affects call density—the number of calls that the DSPs can handle. With higher codec complexity, fewer calls can be handled. Select a higher codec complexity if that is required to support a particular codec or combination of codecs. Select a lower codec complexity to support the greatest number of voice channels, provided that the lower complexity is compatible with the particular codecs in use.

Before you change codec complexity, you must place all of the DSP voice channels in the idle state.

Note In the Cisco MC3810, this command is valid only with installed HCMs, and you must specify voice card 0. If two HCMs are installed, the codec complexity command configures both HCMs at once.

You can construct two separate configurations, one for the Cisco default EC and one for the extended EC, which you can load manually by creating new configurations for each type of EC and reloading the router.

•Use the codec complexity high command for the Cisco default EC.

•Use the codec complexity high ecan-extended command for the extended EC.

•Use the codec complexity medium ecan-extended command for the extended EC.

•Use the codec complexity medium command to enable the extended EC on the Cisco 1700 series and the Cisco ICS 7750.

Examples

The following example sets the codec complexity to high on a Cisco MC3810 that contains one or two HCMs:
Router(config)# voice-card 0 
Router(config-voicecard)# codec complexity high
The following example sets the codec complexity to high on voice card 1 in a Cisco 2600 or Cisco 3600 series router:
Router(config)# voice-card 1 
Router(config-voicecard)# codec complexity high
The following example changes the codec complexity:
Router(voice-card)# codec complexity high ecan-extended
Related Commands

Command

Description

ds0-group

Defines T1/E1 channels for compressed voice calls and the CAS method by which the router connects to the PBX or PSTN.

show voice dsp

Shows the current status of all DSP voice channels.

comfort-noise

To generate background noise to fill silent gaps during calls if voice activity detection (VAD) is enabled, use the comfort-noise command in voice-port configuration mode. To provide silence, use the no form of this command.

comfort-noise
no comfort-noise
Syntax Description

This command has no arguments or keywords.

Defaults

Enabled.

Command Modes

Voice-port configuration

Command History

Release

Modification

11.3(1)T

This command was introduced on the Cisco 3600 series.

12.2(13)T

This command was integrated into Cisco IOS Release 12.2(13)T, and was implemented on the Cisco 2600 series, Cisco 7200 series, and Cisco 7500 series using the extended echo canceller.

Usage Guidelines

If this command is not enabled and VAD is enabled at the remote end of the connection, the user hears dead silence when the remote party is not speaking.

The configuration of this command affects only the silence generated at the local interface; it does not affect the use of VAD on either end of the connection or the silence generated at the remote end of the connection.

Note On the Cisco MC3810, this command cannot be disabled.

Examples

The following example enables background noise on the Cisco 3600 series:
Router(voice-port)# comfort-noise
 voice-port
  comfort-noise
Related Commands

Command

Description

vad (dial-peer configuration)

Enables VAD for calls using a particular dial peer.

vad (voice-port configuration)

Enables VAD for calls using a particular voice port on the
Cisco MC3810.

destination-pattern

To specify either the prefix or the full E.164 telephone number (depending on your dial plan) to be used for a dial peer, use the destination-pattern command in dial-peer configuration mode. To disable the prefix or telephone number, use the no form of this command.

destination-pattern [+] string [T]
no destination-pattern [+] string [T]
Syntax Description

+

(Optional) Character that indicates an E.164 standard number.

string

Series of digits that specify the E.164 or private-dialing-plan telephone number. Valid entries are the digits 0 through 9, the letters A through D, and the following special characters:

•The asterisk (*) and pound sign (#) that appear on standard touchtone dial pads. On the Cisco 3600 series routers only, these characters cannot be used as leading characters in a string (for example, *650).

•Comma (,), which inserts a pause between digits.

•Period (.), which matches any entered digit (this character is used as a wildcard). On the Cisco 3600 series routers, the period cannot be used as a leading character in a string (for example, .650).

•Percent sign (%), which indicates that the previous digit or pattern occurred zero or multiple times, similar to the wildcard usage in the regular expression.

•Plus sign (+), which matches a sequence of one or more matches of the character or pattern.

Note The plus sign used as part of the digit string is different from the plus sign that can be used in front of the digit string to indicate that the string is an E.164 standard number.

•Circumflex (^), which indicates a match to the beginning of the string.

•Dollar sign ($), which indicates a match the null string at the end of the input string.

•Backslash symbol (\), followed by a single character matching that character or used with a single character with no other significance (matching that character).

•Question mark (?), which indicates that the previous digit occurred zero or one time.

•Brackets ( [ ] ), which indicate a range. A range is a sequence of characters enclosed in the brackets; only numeric characters from 0 to 9 are allowed in the range. This is similar to a regular expression rule.

•Parentheses "( )", which indicate a pattern and are the same as the regular expression rule.

T

(Optional) Control character that indicates that the destination-pattern value is a variable-length dial string.

Defaults

Enabled with a null string.

Command Modes

Dial-peer configuration

Command History

Release

Modification

11.3(1)T

This command was introduced on the Cisco 3600 series.

11.3(1)MA

This command was implemented on the Cisco MC3810.

12.0(4)XJ

This command was modified for store-and-forward fax.

12.1(1)

The command as modified for store-and-forward fax was integrated into Cisco IOS Release 12.1(1).

12.0(7)XR

Support for the plus sign, percent sign, question mark, brackets, and parentheses symbols in the dial string was added to the Cisco AS5300.

12.0(7)XK

Support for the plus sign, percent sign, question mark, brackets, and parentheses in the dial string was added to the Cisco 2600 series, Cisco 3600 series, and Cisco MC3810.

12.1(1)T

Modifications made in Cisco IOS Release 12.0(7)XR for the Cisco AS5300 were integrated into Cisco IOS Release 12.1(1)T and were implemented on the Cisco 1750, Cisco 2600 series, Cisco 3600 series, Cisco 7200, and Cisco 7500 series.

12.1(2)T

Modifications made in Cisco IOS Release 12.0(7)XK for the Cisco MC3810 were first supported on the T train.

12.2(8)T

This command was implemented on the Cisco 1751, Cisco 2600 series, Cisco 3600 series, Cisco 3725, and Cisco 3745.

12.2(13)T

This command was integrated into Cisco IOS Release 12.2(13)T and implemented on the Cisco 2600XM, Cisco ICS7750, and Cisco VG200.

Usage Guidelines

This pattern created by this command is used to match dialed digits to a dial peer. The dial peer is then used to complete the call. When a router receives voice data, it compares the called number (the full E.164 telephone number) in the packet header with the number configured as the destination pattern for the voice-telephony peer. The router then strips out the left-justified numbers corresponding to the destination pattern. If you have configured a prefix, the prefix is appended to the front of the remaining numbers, creating a dial string, which the router then dials. If all numbers in the destination pattern are stripped out, the user receives a dial tone.

There are certain areas in the world (for example, certain European countries) where valid telephone numbers can vary in length. Use the optional control character T to indicate that a particular destination-pattern value is a variable-length dial string. In this case, the system does not match the dialed numbers until the interdigit timeout value has expired.

Note Cisco IOS software does not check the validity of the E.164 telephone number; it accepts any series of digits as a valid number.

Examples

The following example shows configuration of the E.164 telephone number 555-7922 for a dial peer:
dial-peer voice 10 pots
 destination-pattern +5557922
The following example shows configuration of a destination pattern in which the pattern "43" is repeated multiple times after the digits "555":
dial-peer voice 1 voip
 destination-pattern 555(43)+
The following example shows configuration of a destination pattern in which the preceding digit or pattern is repeated multiple times:
dial-peer voice 2 voip
 destination-pattern 555%
The following example shows configuration of a destination pattern in which the digit numbers range from between 5553409 to 5559499:
dial-peer voice 3 vofr
 destination-pattern 555[3-9]4[0=9]9
The following example shows configuration of a destination pattern in which the digit numbers range from between 5551439, 5553439, 5555439, 5557439, and 5559439:
dial-peer voice 4 voatm
 destination-pattern 555[13579]439
Related Commands

Command

Description

answer-address

Specifies the full E.164 telephone number to be used to identify the dial peer of an incoming call.

prefix

Specifies the prefix of the dialed digits for this dial peer.

timeouts interdigit

Configures the interdigit timeout value for a specified voice port.

dial-peer voice

To define a particular dial peer to specify the method of voice encapsulation and to enter dial-peer configuration mode, use the dial-peer voice command in global configuration mode. To disable a defined dial peer, use the no form of this command. Alternately, you can disable a dial peer using the no shutdown command in dial-peer configuration mode.

Note This command does not support the extended echo canceller (EC) feature on the Cisco AS5300.

Cisco 1750 and Cisco 1751

dial-peer voice tag {pots | vofr | voip}
no dial-peer voice tag {pots | vofr | voip}
Cisco 2600 Series, Cisco 2600XM, CIsco 3600 Series, Cisco 3700 Series, Cisco IAD2420 Series, and Cisco VG200

dial-peer voice tag {pots | voatm | vofr | voip}
no dial-peer voice tag {pots | voatm | vofr | voip}
Cisco 7200 Series

dial-peer voice tag {vofr}
no dial-peer voice tag {vofr}
Cisco 7204 VXR and Cisco 7206 VXR

dial-peer voice tag {pots | voatm | vofr | voip}
no dial-peer voice tag {pots | voatm | vofr | voip}
Cisco AS5300

dial-peer voice tag {mmoip | pots | vofr | voip}
no dial-peer voice tag {mmoip | pots | vofr | voip}
Cisco MC3810

dial-peer voice tag {pots | voatm | vofr | voip}
no dial-peer voice tag {pots | voatm | vofr | voip}
Syntax Description

tag

Digits that define a particular dial peer. Valid entries are from 1 to 2147483647. There is no default.

mmoip

Multimedia mail peer using IP encapsulation on the IP backbone.

Note On the Cisco AS5300, Multimedia Mail over IP (MMoIP) is available only if you have modem ISDN channel aggregation (MICA) technologies modems.

pots

Plain old telephone service (POTS) peer using Voice over IP encapsulation on the IP backbone.

voatm

(Cisco 2600 series, Cisco 3600 series, Cisco MC3810, Cisco 7204 VXR routers, and Cisco 7206 VXR only) Voice over ATM (VoATM) dial peer using real-time AAL5 voice encapsulation on the ATM backbone network.

vofr

Voice over Frame Relay (VoFR) dial peer using FRF.11 encapsulation on the Frame Relay backbone network.

voip

Voice over IP (VoIP) peer using voice encapsulation on the POTS network.

Defaults

No default behavior or values.

Command Modes

Global configuration

Command History

Release

Modification

11.3(1)T

This command was introduced on the Cisco 3600 series.

11.3(1)MA

This command was implemented on the Cisco MC3810 with support for the pots, voatm, vofr, and vohdlc keywords.

12.0(3)T

This command was implemented on the Cisco AS5300 with support for the pots and voip keywords.

12.0(3)XG

The vofr keyword was added for the Cisco 2600 series and Cisco 3600 series.

12.0(4)T

This command was integrated into Cisco IOS Release 12.0(4)T. The vofr keyword was added for the Cisco 7200 series.

12.0(4)XJ

The mmoip keyword was added for the Cisco AS5300. The dial-peer voice command was implemented for store-and-forward fax.

12.0(7)XK

The voip keyword was added for the Cisco MC3810. The voatm keyword was added for the Cisco 3600 series. Support for the vohdlc keyword on the Cisco MC3810 was removed in this release.

12.1(1)

The mmoip keyword addition in Cisco IOS Release 12.0(4)XJ was integrated into Cisco IOS Release 12.1(1). The dial-peer voice implementation for store-and-forward fax was also integrated into this mainline release.

12.1(2)T

The keyword changes in Cisco IOS Release 12.0(7)XK were integrated into Cisco IOS Release 12.1(2)T.

12.2(8)T

This command was implemented on the Cisco 1751, Cisco 2600 series, Cisco 3600 series, Cisco 3725, and Cisco 3745.

12.2(11)T

This command was integrated into Cisco IOS Release 12.2(11)T and Cisco CallManager Version 3.2. This command was implemented on the Cisco IAD2420 series.

12.2(13)T

This command was implemented on the Cisco 2600XM, Cisco ICS7750, and Cisco VG200.

Usage Guidelines

Use this command to switch to dial-peer configuration mode from global configuration mode. Use the exit command to exit dial-peer configuration mode and return to global configuration mode.

After you have created a dial peer, that dial peer remains active until you disable it. To disable a defined dial peer, use the no form of this command. Alternately, you can use the no shutdown command in dial-peer configuration mode.

In store-and-forward fax on the Cisco AS5300, the POTS dial peer defines the inbound-fax-line characteristics from the sending fax device to the receiving Cisco AS5300 and the outbound-line characteristics from the sending Cisco AS5300 to the receiving fax device. The Multimedia Mail over IP (MMoIP) dial peer defines the inbound-fax-line characteristics from the Cisco AS5300 to the receiving Simple Mail Transfer Protocol (SMTP) mail server. This command applies to both on-ramp and off-ramp store-and-forward fax functions.

Note On the Cisco AS5300, MMoIP is available only if you have Cisco MICA modems. The Cisco AS5300 does not support the extended EC feature.

Examples

The following example configures the extended echo canceller. In this instance, pots indicates that this is a plain old telephone service (POTS) peer using VoIP encapsulation on the IP backbone, and it uses the unique numeric identifier tag 133001.
Router(config)# dial-peer voice 133001 pots
The following example configures POTS peer identified dial peer 10 and MMoIP dial peer 20:
dial-peer voice 10 pots
dial-peer voice 20 mmoip
The following example deletes the MMoIP dial peer 20:
no dial-peer voice 20 mmoip
Related Commands

Command

Description

codec (dial peer)

Specifies the voice coder rate of speech for a Voice over Frame Relay dial peer.

destination-pattern

Specifies the prefix, the full E.164 telephone number, or an ISDN directory number to be used for a dial peer.

dtmf-relay (Voice over Frame Relay)

Enables the generation of FRF.11 Annex A frames for a dial peer.

exit

Exits dial-peer configuration mode and returns to global configuration mode.

preference

Indicates the preferred order of a dial peer within a rotary hunt group.

sequence-numbers

Enables the generation of sequence numbers in each frame generated by the DSP for Voice over Frame Relay applications.

session protocol

Establishes a session protocol for calls between the local and remote routers via the packet network.

shutdown

Disables a dial peer in dial-peer configuration mode.

voice-port

Enters voice-port configuration mode.

ds0-group

To specify the DS-0 time slots that make up a logical voice port on a T1 or E1 controller, to specify the signaling type by which the router communicates with the PBX or PSTN, and to define T1or E1 channels for compressed voice calls and the channel-associated signaling (CAS) method by which the router connects to the PBX or PSTN, use the ds0-group command in controller configuration mode. To remove the group and signaling setting, use the no form of this command.

Cisco 1750 and Cisco 1751 Routers —T1 and E1

ds0-group ds0-group timeslots timeslot-list type [service service-type{data | fax | voice} {e&m-fgb | e&m-fgd | e&m-immediate-start | fgd-eana | fgd-os | fxs-ground-start | fxs-loop-start | none | r1-itu | r1-modified | r1-turkey | sas-ground-start | sas-loop-start}]
no ds0-group ds0-group
Cisco 2600 Series, Cisco 3600 Series, and the Cisco MC3810—T1

ds0-group ds0-group timeslots timeslot-list type {e&m-delay-dial | e&m-fgd | e&m-immediate-start | e&m-wink-start | ext-sig | fgd-eana | fxo-ground-start | fxo-loop-start | fxs-ground-start | fxs-loop-start}
no ds0-group ds0-group
Cisco 2600 Series, Cisco 3600 Series, and the Cisco MC3810—E1

ds0-group ds0-group timeslots timeslot-list type {e&m-delay-dial | e&m-immediate-start | e&m-melcas-delay | e&m-melcas-immed | e&m-melcas-wink | e&m-wink-start | ext-sig | fgd-eana | fxo-ground-start | fxo-loop-start | fxo-melcas | fxs-ground-start | fxs-loop-start | fxs-melcas | r2-analog | r2-digital | r2-pulse}
no ds0-group ds0-group
Cisco 7200 Series and Cisco 7500 Series—T1 and E1 Voice Ports

ds0-group ds0-group timeslots timeslot-list type {e&m-delay-dial | e&m-fgd | e&m-immediate-start | e&m-wink-start | fxs-ground-start | fxs-loop-start | fxo-ground-start | fxo-loop-start}
no dso-group ds0-group
Cisco 7700 Series—T1 and E1 Voice Ports

ds0-group ds0-group-number timeslots timeslot-list type {e&m-delay-dial | e&m-immediate-start | e&m-wink-start | fxs-ground-start | fxs-loop-start | fxo-ground-start | fxo-loop-start}
no ds0-group ds0-group

Note Keywords for this command are configuration-specific. For example, if MGCP is configured, you see the mgcp keyword. If MGCP is not configured, you do not see the mgcp keyword.

In addition, keywords for this command are dependent upon the Cisco IOS release that you are using. Refer to Cisco Feature Navigator at the following URL for information regarding your release:

http://www.cisco.com/go/fn

Syntax Description

addr info

(Optional) Specifies the calling or called party.

ds0-group

A DS-0 group number. T1 range is from 0 to 23. E1 range is from 0 to 14 and 16 to 30;15 is reserved.

service service-type

(Optional) Type of service.

•data—data service

•fax— store-and-forward fax service

•voice—voice service

timeslots timeslot-list

A single time-slot number, a single range of numbers, or multiple ranges of numbers separated by commas. T1 range is from 1 to 24. E1 range is from 1 through 31. The following are examples:

•2

•1-15,17-24

•1-23

•2,4,6-12

tone type

(Optional) Tone type: either dtmf or mf.

type

Signaling method selection for the type keyword depends on the connection that you are making. The E&M interface allows connection for PBX trunk lines (tie lines) and telephone equipment. The FXS interface allows connection of basic telephone equipment and PBX. The FXO interface allows connection of the central office (CO) to a standard PBX interface where permitted by local regulations; it is often used for off-premise extensions (OPXs). Types are as follows:

•e&m-delay-dial—The originating endpoint sends an off-hook signal and then waits for an off-hook signal followed by an on-hook signal from the destination

•e&m-fgb—E&M Type II Feature Group B

•e&m-fgd—E&M Type II Feature Group D

•e&m-immediate-start—E&M immediate start

•e&m-melcas-delay—E&M MELCAS delay-start signaling support

•e&m-melcas-immed—E&M MELCAS immediate-start signaling support

•e&m-melcas-wink—E&M MELCAS wink-start signaling support

•e&m-wink-start—The originating endpoint sends an off-hook signal and waits for a wink-start from the destination

•ext-sig—An option available only when the mode CCS command is enabled on the Cisco MC3810 for FRF.11 transparent CCS support

•fgd-eana—Feature Group D exchange access North American

•fgd-os—Feature Group D operator services

•fxo-ground-start—FXO ground-start signaling

•fxo-loop-start—FXO loop-start signaling

•fxo-melcas—FXO MELCAS signaling

•fxs-ground-start—FXS ground-start signaling

•fxs-loop-start—FXS loop-start signaling

•fxs-melcas—FXS MELCAS signaling

•none—Null signaling for external call control

•p7—p7 switch type

•r1-itu—Line signaling based on international signaling standards

•r1-modified—An international signaling standard that is common to channelized T1/E1 networks

•r1-turkey—A signaling standard used in Turkey

•r2-analog—R2 analog line signaling

•r2-digital—R2 digital line signaling

•r2-lsv181-digital—A specific R2 digital line

•r2-pulse—7-pulse line signaling, a transmitted pulse that indicates a change in the line state

•sas-ground-start—Single attachment station (SAS) ground-start

•sas-loop-start—SAS loop-start

Defaults

No DS-0 group is defined. Calls are allowed in both directions.

Command Modes

Controller configuration

Command History

Release

Modification

11.2

This command was introduced on the Cisco AS5300 as the cas-group command.

11.3(1)MA

The command was introduced on the Cisco MC3810 as the voice-group command.

12.0(1)T

The cas-group command was implemented on the Cisco 3600 series routers.

12.0(5)T

The command was renamed ds0-group on the Cisco AS5300, Cisco 2600 series. and Cisco 3600 series. Some keyword modifications were made.

12.0(5)XE

This command was implemented on the Cisco 7200 series.

12.0(7)XK

Support for this command was extended to the Cisco MC3810. When this command became available on the Cisco MC3810, the voice-group command was removed and no longer supported. The ext-sig keyword replaced the ext-sig-master and ext-sig-slave keywords.

12.0(7)XR

The mgcp service type was added.

12.1(1)T

This command was implemented on the Cisco 7200 series.

12.1(2)XH

The e&m-fgd and fgd-eana keywords were added for Feature Group D signaling.

12.1(3)T

This command was implemented on the Cisco 7500 series. The fgd-os signaling type and the voice service type were added.

12.2(2)XA

This command was implemented on the Cisco AS5300.

12.2(2)T

This command was integrated into Cisco IOS Release 12.2(2)T and implemented on the Cisco 7200 series.

12.2(4)T

Support for the Cisco AS5300, Cisco AS5350, and Cisco AS5400 is not included in this release.

12.2(2)XB1

This command was implemented on the Cisco AS5850.

12.2(4)XM

This command was implemented on the Cisco 1750 and Cisco 1751. Support for other Cisco platforms is not included in this release.

12.2(2)XN

Support for the mgcp keyword was added to Cisco CallManager Version 3.1 for the Cisco 2600 series, Cisco 3600 series, and Cisco VG200.

12.2(8)T

This command was integrated into Cisco IOS Release 12.2(8)T and implemented on the Cisco 7200 series. Support for the Cisco AS5300, Cisco AS5350, Cisco AS5400, and Cisco AS5850 is not included in this release.

12.2(11)T

This command was supported with Cisco IOS Release 12.2(11)T and Cisco CallManager Version 3.2. This command is supported on the Cisco IAD2420 series, Cisco AS5300, Cisco AS5350, Cisco AS5400, and Cisco AS5850 in this release.

12.2(13)T

This command was integrated into Cisco IOS Release 12.2(13)T. The Cisco 1750 and Cisco 1751 do not support T1 and E1 voice and data cards in Cisco IOS Release 12.2(13)T. The Cisco 17xx platforms support only HC DSP firmware images in this release.

Usage Guidelines

This command automatically creates a logical voice port that is numbered as follows:

•Cisco 2600, Cisco 3600, and Cisco 7200 series: slot/port:ds0-group

•Cisco MC3810: slot:ds0-group

On the Cisco MC3810, the slot number is the controller number.

•Cisco AS5300 with a T1 controller: slot/port

Although only one voice port is created for each group, applicable calls are routed to any channel in the group.

Note This command does not support the extended echo canceller (EC) feature on the Cisco AS5x00 series.

Examples

The following example configures ranges of T1 controller time slots for FXS ground-start and FXO loop-start signaling on a Cisco 2600 series, Cisco 3600 series, or Cisco 3700 series:
T1 1/0
 framing esf
 linecode b8zs
 ds0-group 1 timeslots 1-10 type fxs-ground-start
 ds0-group 2 timeslots 11-24 type fxo-loop-start
The following example configures DS-0 groups 1 and 2 on controller T1 1 on the Cisco MC3810 to support transparent common channel signaling (CCS):
controller T1 1
 mode ccs cross-connect
 ds0-group 1 timeslots 1-10 type ext-sig
 ds0-group 2 timeslots 11-24 type ext-sig
The following example configures ranges of T1 controller time slots for FXS ground-start signaling:
controller T1 1/0
 ds0-group 1 timeslots 1-4 type fxs-ground-start
The following example set the T1 channels for SS7 service on any trunking gateway in mgcp mode:
 ds0-group 0 timeslots 1-24 type none service mgcp
The following example sets the T1 channels for SS7 service on any trunking gateway in sgcp mode:
 ds0-group 0 timeslots 1-24 type none service sgcp
The following example sets the T1 channels for FGD-OS service on an Cisco AS5300 in sgcp mode:
Router(config-controller)# ds0-group 0 timeslots 1-24 type fgd-os mf dnis-ani service
Related Commands

Command

Description

cas-group

Configures channelized T1 time slots with robbed-bit signaling.

codec (dial peer)

Specifies the voice coder rate of speech for a dial peer.

codec complexity

Specifies call density and codec complexity based on the codec standard that you are using.

dspint dspfarm

To enable the digital signal processor (DSP) interface, use the dspint dspfarm command in global configuration mode.

dspint dspfarm slot/port
Syntax Description

slot

Slot number of the interface.

port

Port number of the interface.

Defaults

Enabled by default

Command Modes

Global configuration

Command History

Release

Modification

12.0(5)XE

This command was introduced on the Cisco 7200 series routers.

12.1(1)T

This command was integrated into Cisco IOS Release 12.1(1)T.

12.2(13)T

This command was implemented on the Cisco 7200 series.

Usage Guidelines

DSP mapping occurs when DSP resources on one advanced interface module (AIM) or network module are available for processing of voice time-division multiplexing (TDM) streams on a different network module or on a voice/WAN interface card (VWIC). This command is used on Cisco 3660 routers with multiservice interchange (MIX) modules installed or on Cisco 2600 series routers with AIMs installed.

The assignment of DSP pool resources to particular TDM streams is based on the order in which the streams are configured using the ds0-group command for T1/E1 channel-associated signaling (CAS) or using the pri-group command for ISDN PRI.

The assignment of DSP pool resources does not occur dynamically during call signaling.

To disable the DSPfarm interface, enter the no shutdown command.

Examples

The following example creates a DSPfarm interface with a slot number of 1 and a port number of 0.
dspint dspfarm 1/0 
Related Commands

Command

Description

no shutdown

Changes the administrative state of a port from out of service to in service.

show interfaces dspfarm dsp

Displays information about the DSP interface.

echo cancel coverage

To adjust the size of the echo canceller (EC) and to select the extended EC when the Cisco default EC is present, use the echo cancel coverage command in voice-port configuration mode. To reset to the default value, use the no form of this command.

echo cancel coverage {8 | 16 | 24 | 32 | 48 | 64}
no echo cancel coverage
Syntax Description

8

EC size of 8 ms

16

EC size of 16 ms

24

EC size of 24 ms

32

EC size of 32 ms

48

EC size of 48 ms

64

EC size of 64 ms. This is the default

Defaults

64

Command Modes

Voice-port configuration

Command History

Release

Modification

11.3(1)T

This command was introduced on the Cisco 3600 series.

11.3(1)MA

This command was implemented on the Cisco MC3810.

12.0(5)XK

This command was modified to add the 8-ms option.

12.0(5)XE

The command was implemented on the Cisco 7200 series.

12.1(1)T

The Cisco IOS Release 12.0(5)XK and Release 12.0(5)XE changes were integrated into Cisco IOS Release 12.1(1)T.

12.2(13)T

This command was modified to provide a new set of size options when the extended EC is configured. This command is supported on all T1 digital signal processor (DSP) platforms.

Usage Guidelines

Use this command to adjust the coverage size of the EC. This command enables cancellation of voice that is sent out the interface and received on the same interface within the configured amount of time. If the local loop (the distance from the interface to the connected equipment that is producing the echo) is greater than this amount of time, you should increase the configured value of this command.

If you configure a large value for this command, the EC takes longer to converge and you might hear a slight echo when the connection is initially set up. If you configure a small value, you might hear some echo for the duration of the call because the EC is not canceling the longer delay echoes.

There is no echo or echo cancellation on the network (for example, the non-POTS) side of the connection.

Note This command is valid only when the echo canceller feature is enabled. The Cisco proprietary G.165 EC is enabled by default. For more information, refer to the echo cancel enable command reference page.

Examples

The following example enables extended echo cancellation and adjusts the size of the echo canceller to 16 ms on the Cisco 3600 series:
voice-port 1/0/0
 echo cancel enable
 echo cancel coverage 16
The following example enables extended echo cancellation and adjusts the size of the echo canceller to 16 ms on the Cisco MC3810:
voice-port 1/1
 echo cancel enable
 echo cancel coverage 16
Related Commands

Command

Description

echo cancel enable

Enables the cancellation of voice that is sent out the interface and received on the same interface.

echo cancel enable

To enable cancellation—that is, cancellation of voice that is sent out and received on the same interface—use the echo cancel enable command in voice-port configuration mode. To disable echo cancellation, use the no form of this command.

echo cancel enable
no echo cancel enable
Syntax Description

This command has no arguments or keywords.

Defaults

The Cisco proprietary G.165 echo canceller (EC) is enabled with the echo suppressor turned off.

Command Modes

Voice-port configuration

Command History

Release

Modification

11.3(1)T

This command was introduced on the Cisco 3600 series and Cisco MC3810.

12.2(13)T

This command was integrated into Cisco IOS Release 12.2(13)T and implemented on the Cisco 7200 series and Cisco 7500 series. This command is supported on all TI Digital Signal Processor (DSP) platforms.

Usage Guidelines

This command enables cancellation of voice that is sent out the interface and received back on the same interface; sound that is received back in this manner is perceived by the listener as an echo. Disabling echo cancellation might cause the remote side of a connection to hear an echo. Because echo cancellation is an invasive process that can minimally degrade voice quality, this command should be disabled if it is not needed.

Typically a hybrid circuit can provide greater than 6 decibels (dB) of echo return loss (ERL), so the extended EC is configured to handle 6 dB worst case by default. However, if a measurement shows that a circuit can provide only 6 dB ERL or less, you can configure the extended EC to use this lower rate.

The Cisco G.165 EC is enabled by default with the echo suppressor turned off. The echo suppressor can be turned on only with the default Cisco G.165 EC. The echo suppressor command used with the Cisco default EC is still visible when the extended EC is selected, but it does not do anything.

This command does not affect echo heard by the user on the analog side of the connection.

There is no echo path for a four-wire recEive and transMit (also called ear and mouth, abbreviated E&M) interface. Disable the echo canceller for that interface type.

Note This command is valid only when used with the echo cancel coverage command.

Examples

The following example enables extended echo cancellation and adjusts the size of the echo canceller to 16 ms on the Cisco 3600 series:
voice-port 1/0:0
 echo cancel enable
 echo cancel coverage 16
The following example enables extended echo cancellation and adjusts the size of the echo canceller to 16 ms on the Cisco MC3810:
voice-port 1/1
 echo cancel enable
 echo cancel coverage 16
The following example enables extended echo cancellation on the Cisco 1700 series or Cisco ICS7750:
Router(voice-card)# codec complexity medium 
Related Commands

Command

Description

echo cancel coverage

Adjusts the size of the echo canceller.

non-linear

Enables nonlinear processing in the echo canceller.

echo-cancel erl worst-case

To predict the worst-case echo return loss (ERL) that the echo canceller might encounter, use the echo cancel erl worst-case command in voice-port configuration mode. To disable the command, use the no form.

echo cancel erl worst-case {6 | 3 | 0}
no echo cancel erl worst-case {6 | 3 | 0}
Syntax Description

6 | 3 | 0

Loss, in dB. Default is 6.

Defaults

6

Command Modes

Voice-port configuration

Command History

Release

Modification

12.2(13)T

This command was introduced.

Usage Guidelines

This command is used only when the extended EC is present and is not supported with the Cisco proprietary G.165 EC. This command predicts the worst-case echo return loss that the EC might encounter.

To check the configuration, use the show running-config command in privileged EXEC mode.

Examples

The following example shows worst-case ERL selections:
Router(config-voiceport)# echo cancel erl worst-case ? 
  0  Worst case echo canceller operation is 0 dB ERL 
  3  Worst case echo canceller operation is 3 dB ERL 
  6  Worst case echo canceller operation is 6 dB ERL 
The following example sets the worst-case ERL to 3:
Router(config-voiceport)# echo cancel erl worst-case 3
22:51:13:%SYS-5-CONFIG_I:Configured from console by console run | begin
voice-port
Related Commands

Command

Description

echo cancel enable

Enables the cancellation of echo—that is, voice that is sent out and received on the same interface.

echo suppressor

To enable echo suppression to reduce initial echo before the echo canceller converges, use the
echo suppressor command in voice-port configuration mode. To disable echo suppression, use the no form of this command.

echo suppressor seconds
no echo suppressor
Syntax Description

seconds

Suppression coverage, in seconds. Range is from 1 to 10. Default is 7.

Defaults

Disabled

Command Modes

Voice-port configuration

Command History

Release

Modification

12.2(13)T

This command was introduced.

Usage Guidelines

Use this command only when the echo canceller is enabled. In case of double-talk in the first number of seconds, the code automatically disables the suppressor.

Examples

The following example configures echo suppression for a suppression coverage of 9 seconds on a Cisco 3620:
Router(config)# voice-port 1/1:0
Router(config-voiceport)# echo suppressor 9
Related Commands

Command

Description

echo cancel enable

Enables cancellation of echo—that is, voice that is sent out and is received on the same interface.

non-linear

To enable nonlinear processing in the echo canceller, use the non-linear command in voice-port configuration mode. To disable nonlinear processing, use the no form of this command.

non-linear
no non-linear
Syntax Description

This command has no arguments or keywords.

Defaults

Enabled

Command Modes

Voice-port configuration

Command History

Release

Modification

11.3(1)T

This command was introduced on the Cisco 3600 series.

12.2(13)T

This command was integrated into Cisco IOS Release 12.2(13)T and implemented on the following platforms that support the extended G.168 echo canceller (EC): Cisco 1700 series, Cisco 2600 series, Cisco 2600XM, Cisco 3600 series, Cisco 3700 series, Cisco 7200 series, Cisco 7500 series, Cisco ICS7750, Cisco MC3810, and Cisco VG200.

Usage Guidelines

The function enabled by this command is also generally known as residual echo suppression. This command is associated with echo-canceller operation. The echo cancel enable command must be enabled for this command to take effect. Use this command to shut off any signal if no near-end speech is detected.

The Cisco G.165 EC is enabled by default with the echo suppressor disabled. You can enable the echo suppressor only when the default Cisco G.165 EC is used. The default echo suppressor command is still visible when the extended EC is selected, but it does not do anything.

Using this command normally improves performance, although some users might perceive truncation of consonants at the end of sentences when this command is enabled.

Examples

The following example shows that nonlinear call processing is enabled on a Cisco 3600 series:
voice-port 1/0/0
 non-linear
The following example shows that nonlinear call processing is enabled on a Cisco MC3810:
voice-port 1/1
 non-linear
Related Commands

Command

Description

echo cancel enable

Enables the cancellation of voice that is sent out and received on the same interface.

port (dial peer)

To associate a dial peer with a specific voice port,

Hierarchical Navigation

Cisco IOS Software Releases 12.2 Special and Early Deployments

Enhanced ITU-T G.168 Echo Cancellation

Downloads

Table Of Contents

Enhanced ITU-T G.168 Echo Cancellation

Contents

Restrictions

Information About Enhanced ITU-T G.168 Echo Cancellation

Enhanced ITU-T G.168 Echo Cancellation

Voice Paths

Basics of Echo Canceller Operation

Echo Canceller Components

Convolution processor

Nonlinear processor

Echo

Echo Canceller Coverage

How to Configure Enhanced ITU-T G.168 Echo Cancellation

Switching Echo Cancellers

Shutting Down All T1 Voice Ports

SUMMARY STEPS

DETAILED STEPS

Shutting Down the T1 Controller

SUMMARY STEPS

DETAILED STEPS

Changing Codec Complexity

SUMMARY STEPS

DETAILED STEPS

Adding Back the PRI Groups and DS-0 Groups

SUMMARY STEPS

DETAILED STEPS

Reapplying Voice-Port and Serial Interface Configurations

SUMMARY STEPS

DETAILED STEPS

Reassigning Voice Ports to Dial-Peer Configurations

SUMMARY STEPS

DETAILED STEPS

Bringing the T1 Controller Back Up

SUMMARY STEPS

DETAILED STEPS

Enabling the Extended EC on the Cisco 1700 Series and Cisco ICS7750

SUMMARY STEPS

DETAILED STEPS

Changing Codec Complexity on the Cisco 7200 Series

SUMMARY STEPS

DETAILED STEPS

Configuring Echo Cancellation Parameters

SUMMARY STEPS

DETAILED STEPS

Verifying Codec Complexity Settings

Verifying Analog and Digital Voice Port Configurations

Configuration Examples for Enhanced ITU-T G.168 Echo Cancellation

Enabling the Echo Canceller Example

Switching the Echo Canceller Example

Enabling the Extended EC on the Cisco 1700 Series and Cisco ICS 7750 Example

Changing Codec Complexity on the Cisco 7200 Series Example

Adjusting the Echo Canceller Size Example

Worst-Case Echo Return Loss Example

Checking the Active Calls Example

Additional References

Related Documents

RFCs

Standards

MIBs

Technical Assistance

Command Reference

Obsolete and Replaced Commands

codec complexity

Syntax Description

Defaults

Command Modes

Command History

Usage Guidelines

Examples

Related Commands

comfort-noise

Syntax Description

Defaults

Command Modes

Command History