Core issue
The Cisco Catalyst 6500 Series Communications Media Module can support single or multiple Cisco CallManagers in a voice-over-IP network. The Communications Media Module, which acts as the media gateway, uses the Media Gateway Control Protocol (MGCP) to communicate with Cisco CallManager, which acts as the media gateway controller (Call Agent).
The Communications Media Module accepts either a 6-port T1 interface module or a 6-port E1 interface module. You must use the same types of interface modules (either all T1 modules or all E1 modules) in the Communications Media Module; you cannot mix the interface module types.
The 6-port T1/E1 interface modules have onboard digital signal processor (DSP) resources that allow you to connect the interfaces to the public switched telephone network (PSTN) or private branch exchanges (PBXs) through T1 Channel Associated Signaling (CAS) or T1/E1 ISDN Primary Rate Interface (PRI). The DSP resources on the interface modules provide echo cancellation, transcoding, fax relay, tone detection and generation, and jitter buffers.
Resolution
The WS-SVC-CMM-6T1 module requires a minimum CatOS version 7.6(12) and a recommended version of 8.3(3).
For more information, refer to the Product and Software Version Matrix section of Release Notes for Catalyst 6500 Series Software Release 7.x.
You can download the required version from the LAN Switching Software page.
