MGCP No Audio

Unanswered Question
Dec 31st, 2009
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I have two 3845 routers that are being used as voice gateways  The IOS is version 12.4(13f).  I am connecting them to an Avaya PBX through T1 lines provisioned for ISDN.  I'm using MGCP and CUCM 6.  The module in slot 0 is listed as a NM-4VWIC-MBRD.  When I connect the devices through either port on a VWIC-2MFT-T1 in subunit 0 I can make everything work just fine.  The module in slot 3 is an NM-HDV2-2PORT-T1.  In subunit 1 there is an NM-HDV2-ONBOARD-T1-2PORT module listed.  On the router, I set up the T1 controller for that port, set up the voice port, and set up the serial port the same as the ports in slot 0.  On CUCM I set up everything just like the working ports.  However, if I make a phone call and use the lines in slot 3, the phone rings, I get called ID, but when I answer I get no audio.  The person making the call also hears no audio.  They don't even hear a ringback.


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