Table Of Contents
Release Notes for Catalyst 6500 Series and
Cisco 7600 Series Communication Media Module Software Release 12.2(13)ZC
Current Release: 12.2(13)ZC—July 17, 2003
This publication describes the features, modifications, and caveats for the Catalyst 6500 series and Cisco 7600 series Internet Router Communication Media Module (CMM) software release 12.2(13)ZC running Cisco IOS Release 12.1(13)E or later or Catalyst software release 7.3(1) or later.
Note For detailed installation and configuration procedures for the CMM, refer to the Catalyst 6500 Series and Cisco 7600 Series Internet Router Communication Media Module Installation and Configuration Note at the following URL:
Note Except where specifically differentiated, the term "Catalyst 6500 series switches" includes both Catalyst 6500 series and Catalyst 6000 series switches.
This section describes the system requirements for the CMM software release.
The CMM requires either a Supervisor Engine 1 or a Supervisor Engine 2. The supervisor engine can have an MSFC/MSFC2, but the CMM does not require an MSFC/MSFC2 for configuration or operation.
Product Number Product Description Minimum
IOS Release Catalyst Release
Communication Media Module
12.1(13)E or later
7.3(1) or later
Software release 12.2(13)ZC requires Cisco IOS Release 12.1(13)E or later releases or Catalyst software release 7.3(1) or later releases. The recommended Cisco IOS release is 12.1(19)E and the recommended Catalyst software release is 7.5(1).
Cisco CallManager Support
Software release 12.2(13)ZC supports Cisco CallManager release 3.2(2) and later releases.
Orderable Software Images
Table 1 lists the software versions and applicable ordering information for the CMM software.
Table 1 Orderable Software Images
Software Version Filename Orderable Product Number 1
1 Installed on system; append with "=" for spare on floppy media.
Table 2 lists the supported features for the CMM interface modules.
Table 2 CMM Interface Module Supported Features
WS-SVC-CMM-6T1 Module WS-SVC-CMM-6E1 Module
Line code—HDB33 , AMI
Frame format—with CRC4/no CRC4
MGCP gateway fallback8
MGCP gateway fallback8
FDL8, 9 with T1 CAS/PRI for extended super frame (only) signaling.
MGCP and H.3238:
T1-PRI—Supports up to 18 ports10
T1-CAS—Supports up to 18 ports10
T1-CAS E&M11 Wink Start
T1-CAS E&M Delay Dial
T1-CAS E&M Immediate Start12
T1-CAS FXS Loop Start12
T1-CAS FXO Loop Start12
T1-CAS FXS Ground Start12
T1-CAS FXO Ground Start12
Cisco Fax Relay
Music on Hold (unicast, multicast)
DTMF Relay13 , 14
G711 codec (sampling size: 10, 20, and 30 ms)
G729 codec (sampling size: 10, 20, 30, 40, 50, 60 ms)
NSF8, 15, 16
MGCP and H.3238:
E1-PRI—Supports up to 18 ports10
Cisco Fax Relay
Music on Hold (unicast, multicast)
G711 codec (sampling size: 10, 20, and 30 ms)
G729 codec (sampling size: 10, 20, 30, 40, 50, 60 ms)
E1 R2 CAS signaling8, 12
1 B8ZS = binary 8-zero substitution.
2 AMI = alternate mark inversion.
3 HDB3 = high-density bipolar with three zeros.
4 SF = super framing.
5 ESF = extended super framing.
6 CRC = cyclic redundancy check.
7 SRST = Survival Remote Site Telephony.
8 Requires software release 12.2(13)ZC.
9 FDL = Facility Data Link.
10 Number of ports is based on running 12.2(13)ZC software, 20-ms packetization with VAD ON or 30-ms packetization with VAD OFF. With 20-ms packetization and VAD OFF, you are limited to 18 T1-PRI ports, 14 E1-PRI ports, and 16 T1-CAS ports.
11 E&M = ear and mouth.
12 Supported only with H.323.
13 DTMF = Dual Tone Multi-Frequency.
14 DTMF is supported; DTMF/MF is not supported.
15 Not supported with H.323.
16 NSF = Network-Specific Facilities (part of QSIG backhaul enhancement for MGCP).
Usage Guidelines and Restrictions
This section provides usage guidelines and restrictions for the CMM.
•The recommended VAD setting for the CMM is off.
•SNMP is currently not supported on the CMM.
These sections describe the following release caveats:
Open Caveats in Release 12.2(13)ZC
This section describes the known limitations that exist in CMM software release 12.2(13)ZC.
•Under extreme stress conditions, using the write memory or write erase commands can cause call failures.
Workaround: Do not use the write memory or write erase commands under extreme stress conditions. Schedule the use of these commands during off hours. (CSCeb46179)
•Fax relay and pass-through mixed environments result in a fax call failure and VTSP-TIMEOUT messages on the gateway configured for fax pass-through.
Workaround: Configure the same fax mode on both the originating and the terminating gateways. (CSCea38859)
•After a reload with the MGCP (XML) configuration download enabled, there might be a warning on the console displaying, "Warning: Primary line clock source is not operational." Actually, the clock source line primary is configured by MGCP (XML) configuration download before and after a reload. (CSCdy33340)
Resolved Caveats in Release 12.2(13)ZC
This section describes the resolved caveats in CMM software release 12.2(13)ZC.
•When the DSP is under heavy, extended stress testing conditions, you might see a VTSP-2-DSP_TIMEOUT. (CSCdz70097)
•Cisco routers and switches running Cisco IOS software and configured to process Internet Protocol version 4 (IPv4) packets are vulnerable to a Denial of Service (DoS) attack. A rare sequence of crafted IPv4 packets sent directly to the device may cause the input interface to stop processing traffic once the input queue is full. No authentication is required to process the inbound packet. Processing of IPv4 packets is enabled by default. Devices running only IP version 6 (IPv6) are not affected. A workaround is available.
Cisco has made software available, free of charge, to correct the problem.
This advisory is available at
Resolved Caveats in Release 12.2(11)ZC
This section describes the resolved caveats in CMM software release 12.2(11)ZC.
•There might be a problem when fax pass-through is configured but only when a fax or modem is in close proximity to an IP or PSTN phone. Once a call is established through the gateway, one-way audio can be triggered if either the IP phone or the PSTN phone is in close proximity to an audible fax or modem. Fax or modem tones induced into the line through the handset or speakers can trigger a PCM_SWITCHOVER resulting in one-way audio from the PSTN side.
Workaround: Increase the distance between the phone and the fax/modem, or reduce the fax/modem volume. This problem is resolved in Release 12.2(11)ZC. (CSCdz14789)
•There is a problem with voice activity detection (VAD) or silence suppression when these features are enabled on G.729 calls only. A delay will occur on the 7935 Polycom phone with some of the T1 (CAS/PRI) or E1 (PRI) voice calls. The delay is heard in one direction only from the PSTN to the 7935 Polycom phone. The delay problem occurs with varying amounts of delay.
Workaround: Turn off VAD if you experience this delay. This problem is resolved in Release 12.2(11)ZC. (CSCdz19171)
•Voice calls fail on the CMM if the codec type configured is G711ULAW or G711ALAW with a 30-ms sampling rate. There is no problem when configured for 10-ms and 20-ms sampling rates. This problem is resolved in Release 12.2(2)YK1. (CSCdy23154)
•A periodic clicking sound might be heard when a call is put on hold. The workaround is to configure unicast Music on Hold instead of multicast Music on Hold. This problem is resolved in Release 12.2(2)YK1. (CSCdy49606)
•The temperature monitoring process has been optimized to reduce CPU utilization. This problem is resolved in Release 12.2(2)YK1. (CSCdy41750)
•This problem might affect G.729 calls. An intermittent delay might be heard in the PSTN-to-IP phone direction for calls originating from the PSTN to an IP phone. If you experience this problem, the workaround is to turn VAD off. This problem is resolved in Release 12.2(2)YK1. (CSCdy54786)
•The CMM temperature sensors on the baseboard should work as follows: The Sensor 1 field refers to the outtake temperature sensor, and the Sensor 2 field refers to the intake temperature sensor. However, the software "swaps" the temperature readings of the two sensors. This problem is resolved in Release 12.2(2)YK1. (CSCdy84013)
•With auto configuration, you might not be able to download the complete XML configuration file. As a result, the configuration is not done.
Workaround: Manually create the configurations on the gateway. This problem is resolved in Release 12.2(2)YK1. (CSCdy51953)
•When reconfiguring the ISDN switch type from primary-ni to primary-5ess or updating any other value with that endpoint in CCM using the gateway auto configure feature, the T1 controller gets shut down when the reconfiguration is done. As a result of the reconfiguration, the Layer 1 is deactivated.
Workaround: 1. Manually change the switch type rather than using the auto config feature. 2. Or manually do a no shut after the auto reconfiguration is done. This problem is resolved in Release 12.2(2)YK1. (CSCdz17090)
Manual Configuration in the Absence of CMM-Specific XML Files
If you do not have the CMM-specific XML files or do not want to install CMM-specific XML files, you need to perform the following configuration tasks:
Note The problem requiring manual configuration in the absence of CMM-specific XML files has been fixed in the Cisco CallManager 3.2(2c)spF-rc3 support patch. If you load that patch, you do not need to perform the following configuration tasks.
•Configure the clock source line primary and clock source line secondary under T1/E1 controllers as per your requirements. The secondary clock source is a backup for the primary clock source and the CMM supports secondary clock sources from 1 to 17. The CMM must have clock source line primary and clock source line secondary configured to avoid any clock slips.
•The default configuration for the CMM is "Cisco Fax Relay." To run "Fax pass through calls," you need to supplement the default configuration with the following two commands:
–mgcp modem pass through voip mode cisco
–no ccm fax protocol cisco
•The default configuration for "echo cancel coverage" is set to 64 ms. This default can be changed as needed under voice-port configuration.
•The default configuration for "input gain" and "output attenuation" is set to 0 dB. This default can be changed as needed under voice-port configuration.
The manual configuration is lost on a reload if you set the CMM for configuration download from Cisco CallManager. If the configuration is lost, you must reconfigure it. To retain the manual configuration, disable the automatic configuration download from Cisco CallManager before doing a CMM reload.
Related Cisco CallManager Caveats—Release 3.2(2c) and/or Earlier
This section describes the related Cisco CallManager caveats in release 3.2(2c) and/or earlier releases.
Note The caveats listed below have been fixed in the Cisco CallManager 3.2(2c)spF-rc3 support patch.
•The global GW database xxxx.cnf.xml file (in the tftppath directory in Cisco CallManager) does not get updated after changes are made in the MGCP configuration GUI. To update this file, you need to restart "TFTP service" on the Cisco CallManager. (CSCdy10859)
•Adding a new gateway does not automatically create the corresponding xxxx.cnf.xml file (in the tftppath directory in Cisco CallManager). To create this file, you need to restart "TFTP service" on Cisco CallManager. (CSCdy11956)
For more detailed installation and configuration information, refer to the following publications:
•Catalyst 6500 Series and Cisco 7600 Series Internet Router Communication Media Module Installation and Configuration Note
•Regulatory Compliance and Safety Information for the Catalyst 6500 Series Switches
•Catalyst 6500 Series Switch Installation Guide
•Catalyst 6500 Series Switch Quick Software Configuration Guide
•Catalyst 6500 Series Switch Module Installation Guide
•Catalyst 6500 Series Switch Software Configuration Guide
•Catalyst 6500 Series Switch Command Reference
•Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide
•Catalyst 6500 Series Switch Cisco IOS Command Reference
•System Message Guide—Catalyst 6500 Series, 5000 Family, 4000 Family, 2926G Series, 2948G, and 2980G Switches
•For information about MIBs, refer to
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