MGCP and Related Protocols Configuration Guide, Cisco IOS Release 12.4T
Configuring MGCP Basic CLASS and Operator Services
Configuring MGCP Basic CLASS and Operator Services
Last Updated: December 14, 2011
This chapter provides information on configuring and troubleshooting the MGCP Basic (CLASS) and Operation Services feature. The feature provides xGCP support for three-way calling on residential and trunking gateways.
Feature benefits include the following:
For more information about this and related Cisco IOS voice features, see the following:
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see 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 document.
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 MGCP Basic CLASS and Operator Services
Prerequisites are described in the "Prerequisites for Configuring MGCP and Related Protocols" section on page 3 .
Restrictions for MGCP Basic CLASS and Operator Services
To check the type of DSP card in your Cisco MC3810 series platform, enter a show version command at the EXEC prompt.
1 6-DSP (slot 2) High Performance Compression Module(v01.A0)
1 6-DSP (slot 2) Voice Compression Module(v255.V7)
If you have an HCM card, the MGCP BCOS features will function properly. If you have an VCM card, the feature is not supported.
Information About MGCP Basic CLASS and Operator Services
The MGCP BCOS are a set of calling features, sometimes called "custom calling" features, that use MGCP to transmit voice, video, and data over the IP network. These features are usually found in circuit-based networks. MGCP BCOS brings them to the Cisco IOS gateways on packet-based networks.
The MGCP BCOS software is built on the MGCP CAS PBX and AAL2 software package, and supports MGCP 0.1 and the earlier protocol version Simple Gateway Control Protocol (SGCP) 1.1 and 1.5.
The following MGCP BCOS features are available on residential gateways (RGWs) and business gateways (BGWs):
The following two features can be run as residential gateway (RGW) or trunking gateway (TGW) features:
Distinctive Power Ring
A telephone rings in a distinctive pattern when a call comes in from a predefined telephone number. The following patterns are available:
The calling party's telephone number, date, and time of the call appear on the receiving telephone's display between the first and second rings. A maximum of 18 digits are shown., and private and unlisted numbers are displayed. If the called party answers the phone on the first ring, the calling party's number does not appear.
If the called party has an appropriate name display unit, the calling party's name and telephone number appear on the display. The name and number appear between the first and second rings.
If the calling party has blocked Caller ID from displaying the telephone number, the called party sees "P" for private or "Anonymous" on the display unit.
Caller ID with Call Waiting
If the called party has Caller ID and has enabled the Call Waiting feature, then the calling party's name (if an appropriate display unit is available) and telephone number appear while the called party is on the line with another call.
If the calling party has blocked Caller ID from displaying the name and telephone number, the called party will see "P" for private or "Anonymous" on the display unit.
The following scenarios are available:
Also known as Reminder Ring, Ring Splash is activated when the user enables Call Forwarding on the telephone. The user hears Distinctive Power Ring R5 when the line is idle and a call has been forwarded. This reminds the user that Call Forwarding is active.
Distinctive Call-Waiting Tone
The called party hears four audible tone patterns (waiting tones, or WTs) when a call is waiting on the called party's line. The call agent provides the following tone patterns in sequence as the incoming call continues to wait:
For users with an active voice mail system, a special dial tone is heard when the user goes off-hook and a message is waiting. The dial tone is a sequence of 10 short tones followed by a steady tone. If the user has a telephone with a visual message indicator, the indicator light goes on when a message is waiting.
Stutter Dial Tone
This tone is used in place of the dial tone to indicate that a message is waiting. When the user goes off-hook, a sequence of three short tones followed by a steady tone is heard.
Off-Hook Warning Tone
The user hears this tone when the telephone is off-hook. The tone is repeated bursts of sound of rising pitch.
The user can make a 911 call to an Emergency Service Bureau (ESB), and the call is maintained as long as the ESB does not hang up. If the user hangs up, the call is maintained. If the user hangs up and picks up the phone again, the call resumes. If the user hangs up and does not pick up the phone again, the ESB can ring the user and resume the call.
This feature is available in SGCP mode on the Cisco 3660 platforms and in MGCP mode on all supported platforms.
The user can create a 3-way call by pressing the switchhook quickly to put the first call on hold, dial a third party, and press the switchhook again quickly to join all parties to the call. This feature is supported on all five platforms.
Considerations for Three-way Calling
Examples of Service-Provider Solutions
The Basic CLASS and Operator Services features support MGCP solutions in the following areas:
A CLEC can use residential cable access to provide residential customers with basic telephony and data services. CLASS features and Three-way calling, Caller ID with Call Waiting, and Distinctive Call Waiting Tone are features that support these customers. The figure below illustrates a possible residential cable access solution.
Note that, in the figure above, the residential gateway must support the CLASS features and 911 capability.
In these solutions, a call agent provides business voice services that are traditionally offered by a circuit-based PBX. CLASS features and Three-way calling, Caller ID with Call Waiting, Distinctive Call Waiting Tone, and Visual Message Waiting Indicator are features suitable for these customers. The figure below illustrates an IP Centrex solution:
In the figure above, the residential gateway (the Cisco 2600 series platforms) must support the CLASS features.
A CLEC or IXC can provide small, medium, and large businesses with integrated voice and data access services. The integrated access device can be located at the central office or on the customer's premises. Access to the subscriber can be analog or digital, and transport of voice and data can be over IP, Frame Relay, or ATM. CLASS features and Three-way calling, Caller ID with Call Waiting, Distinctive Call Waiting Tone, and Visual Message Waiting Indicator are features suitable for these customers. The figure below illustrates an integrated access solution.
In the figure above, the residential gateway (the Cisco 2600 series and Cisco MC3810 series platforms) must support the CLASS features.
The figure below illustrates a telecommuter or small-office-home-office solution:
In the figure above, the residential gateway must support the CLASS features.
Other solutions are possible using the MGCP open protocol.
Troubleshooting MGCP Basic CLASS and Operator Services
No new or modified configuration tasks are required to initiate MGCP Basic CLASS and Operator Services. MGCP BCOS co resides with MGCP CAS PBX and AAL2 PVC software, for which configuration activities are required. These are discussed in " Appendix A: Configuring MGCP CAS PBX and AAL2 PVC .
The following MGCP BCOS features do not work on telephones from all manufacturers when the telephones are connected to a Cisco MC3810 series platform:
The table below summarizes the findings for the models tested.
To correct this operation, change the idle voltage in the voice port from low to high.
To change the voice port idle voltage, perform these additional steps:
Configuration Examples for MGCP Basic CLASS and Operator Services
No new or modified configuration settings are needed to implement MGCP Basic CLASS and Operator Services. See the MGCP CAS PBX and AAl2 PVC setup in "Appendix A: Configuring MGCP CAS PBX and AAL2 PVC" for sample configurations.
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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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