There is no audio after calls are established between the CallManager and Nortel PBX when using a 26...
There is no audio after calls are established between the CallManager and Nortel PBX when using a 2621XM router with an AIM-voice-30/E1 interface as the IOS gateway to the Nortel PBX. Signaling protocol is E1 QSIG, and the MGCP backhauls to CallManager
Since the setup has Cisco WAN Q Interface Signaling Protocol (QSIG) running as the signaling protocol, the problem could be due to the way Nortel numbers B channels above TS 16. Such issues were reported in the past and caused by the PBX using TS1-30, including TS 16 while we count 1-15, 17-31.
In order to resolve this issue, try these steps:
Add the network-clock-select 1 e1 0/0 command in order to ensure correct synchronization between the AIM voice card and the E1 interface.
Remove the POTS dial peer that has the application mgcpapp command configured because it is not needed for the Media Gateway Control Protocol (MGCP) ISDN operation.
Add the isdn contiguous-bchan command on router's D channel configuration and set the Cisco CallManager Gateway Configuration Channel IE to continuous.
If companding is set to ulaw on the Cisco CallManager gateway, attempt to change this setting to a-law. Also, change the PBX companding to a-law.
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