ISDN Voice Configuration Guide, Cisco IOS Release 15M&T
High-Density Analog (FXS DID FXO) and Digital (BRI) Extension Module for Voice Fax (EVM-HD)
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High-Density Analog (FXS, DID, FXO) and Digital (BRI) Extension Module for Voice-Fax (EVM-HD)

High-Density Analog (FXS, DID, FXO) and Digital (BRI) Extension Module for Voice-Fax (EVM-HD)

Last Updated: December 4, 2012

This chapter describes the High-Density Analog (FXS/DID/FXO) and Digital (BRI) Extension Module for Voice/Fax (EVM-HD) feature, which delivers a higher-density integrated analog/digital voice interface. The EVM-HD-8FXS/DID baseboard network module provides eight Foreign Exchange Station (FXS) or direct inward dialing (DID) ports. This network module accesses digital signal processor (DSP) modules on the motherboard, instead of using onboard DSPs. You can increase the port density by plugging in up to two optional expansion modules in any combination:

  • EM-HDA-8FXS--8-port FXS voice/fax expansion module
  • EM-HDA-3FXS/4FXO--3-port FXS and 4-port FXO voice/fax expansion module
  • EM-HDA-6FXO--6-port FXO voice/fax expansion module
  • EM-4BRI-NT/TE--4-port ISDN BRI expansion module

PVDM2 DSP modules are used in combination with the EVM-HD-8FXS/DID baseboard and its expansion modules. PVDM2 modules are available separately and installed in the DSP module slots located inside the router chassis.

Feature History for the High-Density Analog (FXO/FXS/ DID) and Digital (BRI) Extension Module for Voice/Fax (EVM-HD)

Release

Modification

12.3(8)T4

This feature was introduced on the Cisco 2800 series routers.

12.3(11)T

This feature was integrated into Cisco IOS Release 12.3(11)T. Support was added for the Cisco 3800 series routers and the EM-HDA-3FXS/4FXO and EM-HDA-6FXO expansion modules to provide FXO capability.

12.3(11)T2

The groundstart auto-tip command was added to the command-line interface and the feature was integrated into Cisco IOS Release 12.3(11)T2. This new command is not supported on the Cisco 1700 series platform.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Prerequisites for High-Density Analog and Digital Extension Module for Voice Fax

  • Insert the network modules in the correct slots of the router at your installation. For instructions on hardware installation for this feature, refer to the Cisco Network Modules Hardware Installation Guide .
  • Install DSPs on the baseboard and configure the DSPs with a voice-enabled image of Cisco IOS Release 12.3(8)T4 or 12.3(11)T or a later release.
  • The minimum Cisco IOS Release for this feature is Release 12.3(8)T4. For optimum results, use Cisco IOS Release 12.3(11)T2.

Restrictions for High-Density Analog and Digital Extension Module for Voice Fax

Patch Panel Installation

For the BRI interface port, you must install an appropriate patch panel. Patch panels are generally available from multiple cable and network adapter vendors:

  • If you are using the digital voice module EM-4BRI-NT/TE, you may, at your sole discretion, consider using the JPM2194A patch panel from the Black Box Corporation.
  • The EVM-HD-8FXS/DID baseboard has an RJ-21 connector. The Black Box JPM2194A patch panel accommodates RJ-11 and RJ-45 combinations possible on Cisco high-density expansion modules, and offers flexibility for expansion module upgrades (either analog or digital).

Note


Mention of non-Cisco products or services is for information purposes only and constitutes neither an endorsement nor a recommendation.

For more information about the patch panel, see the Cisco Network Modules Hardware Installation Guide .

Impedance Coefficient Settings

For EVM-HD-8FXS/DID, adjacent ports 0/1, 2/3, 4/5, and 6/7 share the same impedance-coefficient settings within each pair. This pairing is especially important when you are configuring some ports for DID mode and others for FXS mode. DID installations may require different impedance selections resulting from off-premises loop characteristics.

If you change an impedance setting, a message alerts you to the change.

These impedance settings apply to the baseboard (EVM-HD-8FXS/DID) only--not to EM-HDA-8FXS. Setting the impedance on the EM-HDA-8FXS changes only the impedance for the port being configured.

Cisco CallManager Support

Before you can run the High-Density Analog (FXS/DID/FXO) and Digital (BRI) Extension Module for Voice/Fax (EVM-HD) feature, you must install a voice-enabled image of Cisco IOS Release 12.3(8)T4, Release 12.3(11)T, or a later release.

When the High-Density Analog (FXS/DID/FXO) and Digital (BRI) Extension Module for Voice/Fax (EVM-HD) feature is used in a Cisco CallManager network, Release 4.1.2, Release 4.0.2a SR1, or Release 3.3.5 of Cisco CallManager must be installed.

If this feature is used in a Cisco CallManager Express network, Release 3.1 of Cisco CallManager Express must be installed.

EM-HDA-8FXS Ring Signal Has a Maximum of 46 Vrms for 1 REN

FXS ports on the EM-HDA-8FXS have a ring signal of about 46 Vrms with a 1-REN load. If you increase the voltage by reprogramming the PCM codec filters, a false ring-trip occurs. The SLIC ring-trip detection point is determined by the amount of current flowing into the loop, so an increase in voltage increases the current for a given load. This increase in current causes an undesirable false ring trip at a REN of 1 or 2.

Port Numbering on the EM-HDA-3FXS/4FXO Expansion Module

If your installation includes EM-HDA-3FXS/4FXO expansion modules, note that the port numbering on these modules is not consecutive. One port number is "skipped" in the numbering between the FXO and FXS interfaces. This is important when you are defining the port numbers. The table below provides an example port-numbering scheme for FXS and FXO ports on EM-HDA-3FXS/4FXO modules installed in slots EM0 and EM1.

Table 1 Example Port-Numbering Scheme for EM-HDA-3FXS/4FXO

EM0

EM1

2/0/8

FXS

2/0/16

FXS

2/0/9

FXS

2/0/17

FXS

2/0/10

FXS

2/0/18

FXS

2/0/12

FXO

2/0/20

FXO

2/0/13

FXO

2/0/21

FXO

2/0/14

FXO

2/0/22

FXO

2/0/15

FXO

2/0/23

FXO

Information About High-Density Analog and Digital Extension Module for Voice Fax

Key Features

The High-Density Analog and Digital Extension Module for Voice/Fax supports the following:

  • Analog FXS, analog Foreign Exchange Office (FXO), DID, and digital BRI S/T NT/TE
  • Generic DSPware feature support: silent suppression, tone detection, voice codec
  • The following new expansion modules:
    • EM-HDA-3FXS/4FXO--3-port FXS and 4-port FXO voice/fax expansion module
    • EM-HDA-6FXO--6-port FXO voice/fax expansion module
    • EM-4BRI-NT/TE--4-port ISDN BRI expansion module
  • The existing EM-HDA-8FXS expansion module
  • G.168 ECAN echo-cancellation support
  • Signaling types:
    • FXO and FXS: Ground-start and loop-start
    • DID: Wink-start, immediate-start, and delay-start
  • VoX (Voice over Packet) protocol support:
    • VoIP for H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP) as supported by Cisco IOS software
    • VoFR or VoATM as supported by Cisco IOS software
  • Channel-bank emulation and cross connect
  • Hairpinning:
    • Digital to digital (same card)
    • Analog to digital (same card)
  • BRI ports with inline power support
  • BRI S/T NT/TE support, clock distribution, synchronization
  • REN support: five RENs per port

FXS and FXO Interfaces

An FXS interface connects the router or access server to end-user equipment such as telephones, fax machines, or modems. The FXS interface supplies ring, voltage, and dial tone to the station. An FXO interface is used for trunk, or tie line, connections to a PSTN CO or to a PBX. This interface is of value for off-premises station applications.

FXO and FXS interfaces indicate on-hook or off-hook status and the seizure of telephone lines by one of two access signaling methods: loop-start or ground-start. The type of access signaling is determined by the type of service from the CO; standard home telephone lines use loop-start, but business telephones can use ground-start lines instead.

Loop-start is the more common of the access signaling techniques. When a handset is picked up (the telephone goes off-hook), this action closes the circuit that draws current from the telephone company CO and indicates a change in status, which signals the CO to provide dial tone. An incoming call is signaled from the CO to the handset by a standard on/off pattern signal, which causes the telephone to ring.

For information related to the hardware connections, refer to the hardware documents listed in the FXS and FXO Interfaces.

Network Clock Timing

Voice systems that pass digitized pulse-code modulation (PCM) speech have always relied on the clocking signal being embedded in the received bit stream. This technique allows connected devices to recover the clock signal from the bit stream, and then use this recovered clock signal to ensure that data on different channels keeps the same timing relationship with other channels.

If a common clock source is not used between devices, the binary values in the bit streams may be misinterpreted because the device samples the signal at the wrong moment. As an example, if the local timing of a receiving device is using a slightly shorter time period than the timing of the sending device, a string of eight continuous binary 1s may be interpreted as nine continuous 1s. If this data is then resent to further downstream devices that use varying timing references, the error can be compounded. When you make sure that each device in the network uses the same clocking signal, the integrity of the traffic can be trusted.

If timing between devices is not maintained, a condition known as clock slip can occur. Clock slip is the repetition or deletion of a block of bits in a synchronous bit stream due to a discrepancy in the read and write rates at a buffer.

Slips are caused by the inability of an equipment buffer store (or other mechanisms) to accommodate differences between the phases or frequencies of the incoming and outgoing signals in cases where the timing of the outgoing signal is not derived from that of the incoming signal.

A BRI interface sends traffic inside repeating bit patterns called frames. Each frame is a fixed number of bits. This means that the receiving device knows exactly when to expect the end of a frame simply by counting the bits as they arrive. Therefore, if the timing between the sending and receiving device is not the same, the receiving device may sample the bit stream at the wrong moment, resulting in an incorrect value being returned.

Even though you can configure Cisco IOS software to control the clocking on these devices, the default clocking mode is effectively free running, meaning that the received clock signal from an interface is not connected to the backplane of the router and used for internal synchronization between the rest of the router and its interfaces. The router uses its internal clock source to pass traffic across the backplane and other interfaces.

For data applications, this internal clock sourcing generally does not present a problem because a packet is buffered in internal memory and is then copied to the transmit buffer of the destination interface. The reading and writing of packets to memory effectively removes the need for any clock synchronization between ports.

Digital voice ports have a different issue. Unless otherwise configured, Cisco IOS software uses the backplane (or internal) clocking to control the reading and writing of data to the DSPs. If a PCM stream comes in on a digital voice port, it uses the external clocking for the received bit stream. However, this bit stream is not necessarily using the same reference as the router backplane, meaning the DSPs can misinterpret the data that is coming in from the controller.

This clocking mismatch is seen on the router's BRI controller as a clock slip--the router is using its internal clock source to send the traffic out the interface but the traffic coming in to the interface is using a completely different clock reference. Eventually, the difference in the timing relationship between the transmit and receive signal becomes so great that the controller registers a slip in the received frame.

To eliminate the problem, you must change the default clocking behavior through Cisco IOS configuration commands. It is absolutely critical to set up the clocking commands properly.

Even though the following commands are optional, we strongly recommend that you enter them as part of your configuration that you ensure proper network clock synchronization:

network-clock-participate slot slot-number

network-clock-select priority bri t1 e1 } slot/port

The network-clock-participate command allows the router to use the clock from the line via the specified slot and synchronize the onboard clock to the same reference.

If multiple VWICS are installed, you must repeat the commands for each installed card. The system clocking can be confirmed using the show network clocks command.

How to Configure High-Density Analog and Digital Extension Module for Voice Fax

Configuring Analog FXS FXO and DID Voice Ports

Perform this task to configure analog FXS/FXO and DID voice ports.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    voice-port slot/subunit/port

4.    shutdown

5.   Do one of the following:

  • signal {loopStart | groundStart}
  • signal did (immediate-start| wink-start | delay-start}

6.    cptone locale

7.    compand-type {u-law| a-law}

8.    input gain decibels

9.    output attenuation decibels

10.    echo-cancel enable

11.    echo-cancel coverage {24| 32 | 48| 64}

12.    timeouts initial seconds

13.    timeouts interdigit seconds

14.    impedance {600c | 600r | 900c | 900r | complex1 | complex2}

15.    ring frequency {25 | 50}

16.    ring cadence {[pattern01 | pattern02| pattern03 | pattern04 | pattern05 | pattern06 | pattern07 | pattern08 | pattern09 | pattern10 | pattern11 | pattern12] | define pulse-interval}

17.    description string

18.    no shutdown


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables 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/subunit/port


Example:

Router(config)# voice-port 2/0/0

 

Enters voice-port configuration mode.

  • The arguments are as follows:
    • slot--Specifies the number of the router slot where the voice network module is installed.
    • subunit--Specifies the location of the Cisco High-Density Analog Voice/Fax Network Module (EVM-HD). For this feature, the only valid entry is 0.
    • port--Indicates the voice port.
Note    A slash must be entered between arguments.
  • Valid entries vary by router platform; enter the show voice port summarycommand for available values.
 
Step 4
shutdown


Example:

Router(config-voiceport)# shutdown

 

Shuts down the specified port so that it is offline when the configuration commands are entered.

 
Step 5
Do one of the following:
  • signal {loopStart | groundStart}
  • signal did (immediate-start| wink-start | delay-start}


Example:

Router(config-voiceport)# signal groundStart



Example:



Example:



Example:



Example:

Router(config-voiceport)# signal did immediate-start

 

Selects the access signaling type to match that of the telephony connection you are making.

  • FXS voice ports:
    • loopStart--(default) Uses a closed circuit to indicate off-hook status; used for residential loops.
    • groundStart--Uses ground and current detectors; preferred for PBXs and trunks.

or

  • DID support (applies only to the base voice module).
    • immediate-start--Enables immediate-start signaling on the DID voice port.
    • wink-start--Enables wink-start signaling on the DID voice port.
    • delay-start--Enables delay-start signaling on the DID voice port.
  • To disable DID and reset to loop-start signaling, use the no signal didcommand.
 
Step 6
cptone locale


Example:

Router(config-voiceport)# cptone au

 

Specifies the two-letter locale for the voice-call progress tones and other locale-specific parameters to be used on this voice port.

  • Cisco routers comply with the ISO 3166 locale name standards. To see valid choices, enter a question mark (?) following the cptone command.
  • The default is us.
 
Step 7
compand-type {u-law| a-law}


Example:

Router(config-voiceport)# compand type u-law

 

Specifies the companding standard used.

  • This command is used in cases when the DSP is not used, such as local cross-connects, and overwrites the compand-type value set by the cptone command.
  • The default for E1 is a-law.
  • The default for T1 is u-law.
Note    If you have a Cisco 3660 router, the compand-type a-law command must be configured on the analog ports only. The Cisco 2660, 3620, and 3640 routers do not require the compand-type a-law command to be configured; however, if you request a list of commands, the compand-type a-law command displays.
 
Step 8
input gain decibels


Example:

Router(config-voiceport)# input gain 0

 

Configures a specific input gain, in decibels, to be inserted at the receiver side of the interface.

  • Range is integers from -14 to +6.
  • The default is 0.
 
Step 9
output attenuation decibels


Example:

Router(config-voiceport)# output attenuation 0

 

Configures a specific output attenuation, in decibels, at the transmit side of the interface.

  • Range is integers from -6 to +14.
  • The default is 0.
 
Step 10
echo-cancel enable


Example:

Router(config-voiceport)# echo-cancel enable

 

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

 
Step 11
echo-cancel coverage {24| 32 | 48| 64}


Example:

Router(config-voiceport)# echo-cancel coverage 48

 

Adjusts the echo canceller by the specified number of ms.

  • The default is 64.
 
Step 12
timeouts initial seconds


Example:

Router(config-voiceport)# timeouts initial 5

 

Specifies the number of seconds for which the system waits for the caller to input the first digit of the dialed digits.

  • Range is from 0 to 120.
  • The default is 10.
 
Step 13
timeouts interdigit seconds


Example:

Router(config-voiceport)# timeouts interdigit 5

 

Specifies the number of seconds for which the system will wait (after the caller has input the initial digit) for the caller to input a subsequent digit of the dialed digits.

  • Range is from 0 to 120.
  • The default is 10.
 
Step 14
impedance {600c | 600r | 900c | 900r | complex1 | complex2}


Example:

Router(config-voiceport)# impedance complex1

 

Specifies the terminating impedance of a voice-port interface for FXS only. Keywords are as follows:

  • 600c --600 ohms (complex)
  • 600r --600 ohms (real)
  • 900c --900 ohms (complex)
  • 900r --900 ohms (real)
  • complex1 --Complex 1
  • complex2 --Complex 2

The default is 600r.

Note    For EVM-HD-8FXS/DID, adjacent ports 0/1, 2/3, 4/5, and 6/7 share the same impedance coefficient settings within each pair. If you change an impedance setting, a message alerts you to the change. This behavior applies only to EVM-HD-8FXS/DID. It does not apply to EM-HDA-8FXS.
 
Step 15
ring frequency {25 | 50}


Example:

Router(config-voiceport)# ring frequency 50

 

(Optional) Selects the ring frequency, in Hz, used on the FXS interface.

  • The default is 25.
  • This number must match the connected telephony equipment and may be country-dependent.
  • If not set properly, the attached telephony device may not ring or it may buzz.
 
Step 16
ring cadence {[pattern01 | pattern02| pattern03 | pattern04 | pattern05 | pattern06 | pattern07 | pattern08 | pattern09 | pattern10 | pattern11 | pattern12] | define pulse-interval}


Example:

Router(config-voiceport)# ring cadence pattern04

 

(Optional) Specifies an existing pattern for ring, or defines a new one.

  • Each pattern specifies a ring-pulse time and a ring-interval time.
  • The keywords and arguments are as follows:
    • pattern01 to pattern12--Preset ring cadence patterns. Enter ring cadence ? to display ring pattern explanations.
    • define pulse-interval--User-defined pattern: pulse is a number (one or two digits, from 1 to 50) specifying ring pulse (on) time in hundreds of milliseconds, and interval is a number (one or two digits from 1 to 50) specifying ring interval (off) time in hundreds of milliseconds.
  • The default is the pattern specified by the cptone locale that has been configured.
 
Step 17
description string


Example:

Router(config-voiceport)# description alpha central

 

Attaches a text string to the configuration that describes the connection for this voice port.

  • string --Character string from 1 to 255 characters in length.
  • The default is no text string (describing the voice port) attached to the configuration.
 
Step 18
no shutdown


Example:

Router(config-voiceport)# no shutdown

 

Activates the voice port.

  • If a voice port is not being used, shut the voice port down with the shutdown command.
 

Troubleshooting Tips

In some rare instances, if you have installed the EM-HDA-3FXS/4FXO or the EM-HDA-6FXO and configured the voice port for groundstart signaling, you may have difficulty connecting some outgoing calls. The problem relates to the FXO groundstart voice port failing to detect a tip-ground acknowledgment, resulting in an unsuccessful call setup.

If you encounter this problem, upgrade your Cisco IOS software image to the latest version (for example, if you have Release 12.3(11)T installed, upgrade to Release 12.3(11)T2). This should fix the problem.

If this problem still occurs, you must enable the groundstart auto-tip command in the configuration of the FXO voice port. When you are placing outgoing calls, this ensures that the circuit detects a tip-ground acknowledgment from the far end and completes the connection within the time-out parameter.

For more information about this problem, see the document Troubleshoot Analog FXO GroundStart Outbound Call Failures . This document is available on Cisco.com.

Examples

This section shows a sample topology (see the figure below) and configuration for the EVM-HD-8FXS/DID used as an analog DID voice gateway connecting to the PSTN.

The following sample shows the configuration commands used for DID signaling:

!
!
voice-port 2/0/0
  signal did immediate
!
voice-port 2/0/1
!
  signal did wink-start
  timing wait-wink 550 <--  sets max time to wait for wink signaling after outgoing 
	seizure is sent. Default is 550 ms.
  timing wink-wait 200 <--  sets the maximum time to wait before sending wink signal after
	an incoming seizure is detected. Default is 200 ms.
  timing wink-duration 200 <--  sets duration of wink-start signal. Default is 200 ms.
!
voice-port 2/0/2
!
  signal did delay-dial
  timing delay-duration 200 <--  sets duration of the delay signal. Default is 200 ms.
  timing delay-start 300 <--  sets delay interval after incoming seizure is detected. Default is 300 ms.
!
Output of the show voice port Command: Example

The following output is based on the sample configuration:

Router# show voice port 2/0/1
Foreign Exchange Station with Direct Inward Dialing (FXS-DID) 2/0/0 Slot is 2, Sub-unit 
is 0, Port is 0
 Type of VoicePort is DID-IN
 Operation State is DORMANT
 Administrative State is UP
 No Interface Down Failure
 Description is not set
 Noise Regeneration is enabled
 Non Linear Processing is enabled
 Music On Hold Threshold is Set to -38 dBm
 In Gain is Set to 0 dB
 Out Attenuation is Set to 0 dB
 Echo Cancellation is enabled
 Echo Cancel Coverage is set to 8 ms
 Playout-delay Mode is set to default
 Playout-delay Nominal is set to 60 ms
 Playout-delay Maximum is set to 200 ms
 Connection Mode is normal
 Connection Number is not set
 Initial Time Out is set to 10 s
 Interdigit Time Out is set to 10 s
 Ringing Time Out is set to 180 s
 Companding Type is u-law
 Region Tone is set for US
Analog Info Follows:
 Currently processing none
 Maintenance Mode Set to None (not in mtc mode)
 Number of signaling protocol errors are 0
 Impedance is set to 600r Ohm
 Wait Release Time Out is 30 s
 Station name None, Station number None
Voice card specific Info Follows:
 Signal Type is wink-start
 Dial Type is dtmf
 In Seizure is inactive
 Out Seizure is inactive
 Digit Duration Timing is set to 100 ms
 InterDigit Duration Timing is set to 100 ms
 Pulse Rate Timing is set to 10 pulses/second
 InterDigit Pulse Duration Timing is set to 750 ms
 Clear Wait Duration Timing is set to 400 ms
 Wink Wait Duration Timing is set to 200 ms
 Wait Wink Duration Timing is set to 550 ms
 Wink Duration Timing is set to 200 ms
 Delay Start Timing is set to 300 ms
 Delay Duration Timing is set to 2000 ms
 Dial Pulse Min. Delay is set to 140 ms
 Percent Break of Pulse is 60 percent 
 Auto Cut-through is disabled
 Dialout Delay for immediate start is 300 ms

Configuring ISDN BRI Digital Interfaces

To configure the ISDN BRI digital interfaces, perform this task.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    isdn switch-type switch-type

4.    network-clock-participate slot slot-number

5.    network-clock-select priority {bri | t1| e1} slot/port

6.   Do one of the following:

  • interface bri slot/port
  • interface bri slot/subslot/port

7.    isdn overlap-receiving

8.    isdn twait-disable

9.    isdn spid1 spid-number [ldn]

10.    isdn spid2 spid-number [ldn]

11.    isdn incoming-voice voice

12.    shutdown

13.    isdn layer1-emulate {user| network}

14.   Do one of the following:

  • line-power
  • no line-power

15.    no shutdown

16.    isdn protocol-emulate {user| network}

17.    isdn sending-complete

18.    isdn static-tei tei-number

19.    end

20.    clear interface slot|port


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
isdn switch-type switch-type


Example:

Router(config)# isdn switch-type basic-qsig

 

Configures the global ISDN switch type.

  • Switch types for an NT interface are basic-net3 and basic-qsig.
 
Step 4
network-clock-participate slot slot-number


Example:

Router(config)# network-clock-participate slot 2

 

Allows the ports on a specified network module or VWIC to use the network clock for timing.

  • slot-number --the network module slot number on the router chassis.
 
Step 5
network-clock-select priority {bri | t1| e1} slot/port


Example:

Router(config)# network-clock-select 1 bri 2/0

 

(Optional) Allows backplane TDM PLL circuitry to select recovered timing references from operating digital links according to a defined priority.

  • The priorityargument specifies selection priority for the clock sources (1 is the highest priority).
  • When the higher-priority clock source fails, the next-higher-priority clock source is selected.
  • The bri keyword specifies that the slot is configured as BRI.
  • The t1 keyword specifies that the slot is configured as T1.
  • The e1 keyword specifies that the slot is configured as E1.
  • The slotargument is the slot number identifying the controller that is the clock source.
  • The portargument is the port number identifying the controller that is the clock source.
    • The range is from 0 to 7.
 
Step 6
Do one of the following:
  • interface bri slot/port
  • interface bri slot/subslot/port


Example:

Router(config)# interface bri 2/0



Example:



Example:



Example:



Example:

Router(config)# interface bri 0/1/0

 

Enters interface configuration mode for the specified interface.

  • slot --Identifies the location of the voice network module in the router.
  • port --Identifies the location of the BRI VIC in the voice network module. Range is 0 to 7:
    • Port 0 to 3 for EM-4BRI installed in EM0.
    • Port 4 to 7 for EM-4BRI installed in EM1.
Note    For the Cisco 2800 series, there are two kinds of port numbering: slot / port and slot / subslot / port. The first example shows that the network module is in slot 2. The second example shows that the VIC2-2BRI is in HWIC slot 1. The first 0 means the module is on the motherboard, the 1 means it is in HWIC slot 1, and the last 0 means it is the first BRI interface on VIC2-2BRI.
 
Step 7
isdn overlap-receiving


Example:

Router(config-if)# isdn overlap-receiving

 

(Optional) Activates overlap signaling to send to the destination PBX.

  • In this mode, the interface waits for possible additional call-control information.
 
Step 8
isdn twait-disable


Example:

Router(config-if)# isdn twait-disable

 

(Optional) Delays a National ISDN BRI switch a random time before activating the Layer 2 interface when the switch starts up.

  • Use this command when the ISDN switch type is basic-ni1.
 
Step 9
isdn spid1 spid-number [ldn]


Example:

Router(config-if)# isdn spid1 12

 

(Optional) Specifies a SPID and optional local directory number for the B1 channel.

Note    This command applies to TE configuration only.
  • The spid-number argument identifies the service to which you have subscribed. This value is assigned by the ISDN service provider and is usually a 10-digit telephone number with additional digits such as 40855501000101.
  • (Optional) The ldnargument is a seven-digit number assigned by the service provider. You can optionally specify a second and third LDN.
  • Only the DMS-100 and NI-1 switch types require SPIDs.
  • Although some switch types might support a SPID, Cisco recommends that you set up ISDN service without SPIDs.
 
Step 10
isdn spid2 spid-number [ldn]


Example:

Router(config-if)# isdn spid2 13

 

(Optional) Specifies a SPID and optional local directory number for the B2 channel.

Note    This command applies to TE configuration only.
  • The spid-number argument identifies the service to which you have subscribed. This value is assigned by the ISDN service provider and is usually a ten-digit telephone number with additional digits such as 40855501000101.
  • (Optional) The ldnargument is a seven-digit number assigned by the service provider. You can optionally specify a second and third LDN.
 
Step 11
isdn incoming-voice voice


Example:

Router(config-if)# isdn incoming-voice voice

 

Configures the port to treat incoming ISDN voice calls as voice calls that are handled by either a modem or a voice DSP, as directed by the call-switching module.

 
Step 12
shutdown


Example:

Router(config-if)# shutdown

 

(Optional) Resets the interface.

  • Do this before setting the port emulation.
 
Step 13
isdn layer1-emulate {user| network}


Example:

Router(config-if)# isdn layer1-emulate network

 

(Optional) Configures the Layer-1 port-mode emulation and clock settings.

  • Enter userto configure the port as TE and to function as a clock slave. This is the default.
  • Enter network to configure the port as NT and to function as a clock master.
 
Step 14
Do one of the following:
  • line-power
  • no line-power


Example:

Router(config-if)# line-power



Example:



Example:

or



Example:



Example:

Router(config-if)# no line-power

 

Turns on or off the power supplied from an NT-configured port to a TE device.

 
Step 15
no shutdown


Example:

Router(config-if)# no shutdown

 

Activates the interface.

 
Step 16
isdn protocol-emulate {user| network}


Example:

Router(config-if)# isdn protocol-emulate network

 

Configures the Layer 2 and Layer 3 port protocol emulation. Keywords are as follows:

  • user --Configures the port as TE; the PBX is the master. This is the default.
  • network --Configures the port as NT; the PBX is the slave.
 
Step 17
isdn sending-complete


Example:

Router(config-if)# isdn sending-complete

 

(Optional) Configures the voice port to include the Sending Complete information element in the outgoing call setup message.

  • This command is used in some geographic locations, such as Hong Kong and Taiwan, where the sending complete information element is required in the outgoing call setup message.
 
Step 18
isdn static-tei tei-number


Example:

Router(config-if)# isdn static-tei 33

 

(Optional) Configures a static ISDN Layer 2 terminal-endpoint identifier (TEI). The argument is as follows:

  • tei-number --Range is 0 to 64.
 
Step 19
end


Example:

Router(config-if)# end

 

Exits interface configuration mode.

 
Step 20
clear interface slot|port


Example:

Router# clear interface 2/0

 

(Optional) Resets the interface.

  • The interface needs to be reset if the static TEI number has been configured in Step 18 . Arguments are as follows:
    • slot--Location of the voice network module in the router.
    • port--Location of the BRI VIC in the voice network module. Range is from 0 to 7.
 

Configuration Examples for High-Density Analog and Digital Extension Module for Voice Fax

show running-config Command Example

This example shows the result of a show running-config command used with a base voice module (8FXS/DID) and one 4BRI expansion module:

Router1# show running-config
isdn switch-type basic-dms100
!
voice-card 0
 no dspfarm
!
interface GigabitEthernet0/0
 ip address 10.0.0.0 255.255.0.0
 duplex auto
 speed auto
!
interface GigabitEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface BRI2/0
 no ip address
 isdn switch-type basic-dms100
 isdn incoming-voice voice
!
interface BRI2/1
 no ip address
!
interface BRI2/2
 no ip address
!
interface BRI2/3
 no ip address
!
voice-port 2/0/0
 signal did wink-start
!
voice-port 2/0/1
 signal did wink-start
!
voice-port 2/0/2
 caller-id enable
!
voice-port 2/0/3
 caller-id enable
!
voice-port 2/0/4
 caller-id enable
!
voice-port 2/0/5
 caller-id enable
!
voice-port 2/0/6
 caller-id enable
!
voice-port 2/0/7
 caller-id enable
!
voice-port 2/0/8
!
voice-port 2/0/9
!
voice-port 2/0/10
!
voice-port 2/0/11
!
voice-port 2/0/17
 caller-id enable
 signal groundStart
!
voice-port 2/0/18
 caller-id enable
!
voice-port 2/0/19
 caller-id enable
!
dial-peer voice 1 pots
 destination-pattern 202
 port 2/0/2
!
dial-peer voice 2 pots
 destination-pattern 203
 port 2/0/3
!
dial-peer voice 3 pots
 destination-pattern 204
 port 2/0/4
!
dial-peer voice 4 pots
 destination-pattern 205
 port 2/0/5
!
dial-peer voice 5 pots
 destination-pattern 206
 port 2/0/6
!
dial-peer voice 6 pots
 destination-pattern 207
 port 2/0/7
!
end

show running-config Command Example with Base Voice Module and Two 4BRI Expansion Modules

This example shows the result of a show running-config command used with base voice module (8FXS/DID) and two 4BRI expansion modules. Note that the BRI interfaces are from BRI 2/0 to BRI 2/7, but that the voice ports for those BRIs are from 2/0/8 to 2/0/11 and 2/0/16 to 2/0/19.

version 12.3
network-clock-participate slot 2
network-clock-select 1 BRI2/2
network-clock-select 2 BRI2/3
network-clock-select 3 BRI2/4
network-clock-select 4 BRI2/5
network-clock-select 5 BRI2/6
network-clock-select 6 BRI2/7
!
isdn switch-type basic-net3
voice-card 0
 no dspfarm
!
interface BRI2/0
 no ip address
 isdn switch-type basic-net3
 isdn protocol-emulate network
 isdn layer1-emulate network
 isdn incoming-voice voice
 isdn skipsend-idverify
!
interface BRI2/1
 no ip address
 isdn switch-type basic-net3
 isdn protocol-emulate network
 isdn layer1-emulate network
 isdn incoming-voice voice
 isdn skipsend-idverify
!
interface BRI2/2
 no ip address
 isdn switch-type basic-net3
 isdn incoming-voice voice
!
interface BRI2/3
 no ip address
 isdn switch-type basic-net3
 isdn incoming-voice voice
!
interface BRI2/4
 no ip address
 isdn switch-type basic-net3
 isdn incoming-voice voice
!
interface BRI2/5
 no ip address
 isdn switch-type basic-net3
 isdn incoming-voice voice
!
interface BRI2/6
 no ip address
 isdn switch-type basic-net3
 isdn incoming-voice voice
!
interface BRI2/7
 no ip address
 isdn switch-type basic-net3
 isdn incoming-voice voice
!
voice-port 2/0/0
 cptone IT
!
voice-port 2/0/1
 cptone IT
!
voice-port 2/0/2
 cptone IT
!
voice-port 2/0/3
 cptone IT
!
voice-port 2/0/4
 cptone IT
!
voice-port 2/0/5
 cptone IT
!
voice-port 2/0/6
 cptone IT
!
voice-port 2/0/7
 cptone IT
!
voice-port 2/0/8
 cptone IT
!
voice-port 2/0/9
 cptone IT
!
voice-port 2/0/10
 cptone IT
!
voice-port 2/0/11
 cptone IT
!
voice-port 2/0/16
 cptone IT
!
voice-port 2/0/17
 cptone IT
!
voice-port 2/0/18
 cptone IT
!
voice-port 2/0/19
 cptone IT
!
dial-peer voice 200 pots
 destination-pattern 200
 port 2/0/0
!
dial-peer voice 201 pots
 destination-pattern 201
 port 2/0/1
!
dial-peer voice 202 pots
 destination-pattern 202
 port 2/0/2
!
dial-peer voice 203 pots
 destination-pattern 203
 port 2/0/3
!
dial-peer voice 204 pots
 destination-pattern 204
 port 2/0/4
!
dial-peer voice 205 pots
 destination-pattern 205
 port 2/0/5
!
dial-peer voice 206 pots
 destination-pattern 206
 port 2/0/6
!
dial-peer voice 207 pots
 destination-pattern 207
 port 2/0/7
!
end

Additional References

The following sections provide references related to the High-Density Analog (FXS/DID/FXO) and Digital (BRI) Extension Module for Voice/Fax feature.

Related Documents

Related Topic

Document Title

Hardware installation instructions for network modules

Cisco Network Modules Hardware Installation Guide

General information about voice configuration and command

Cisco IOS Voice Command Reference, Release 12.3T

Update to information about voice configuration cards

Voice Network Module and Voice Interface Card Configuration Note

Standards

Standards

Title

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

--

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.

--

MIBs

MIBs

MIBs Link

  • CISCO-ENTITY-VENDORTYPE-OID-MIB
  • OLD-CISCO-CHASSIS-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

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, and tools. Registered Cisco.com users can log in from this page to access even more content.

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

Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R)

Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

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