We have configured an Intercluster trunk between an Avaya S8300 and Call Manager 3.3. When calls are placed from an Avaya IP phone to a Cisco IP Phone everything works fine. When calls are placed from Cisco IP phones to the Avaya system the call completes but there is no audio. Also the call terminates after 8 seconds with no user intervention. This happens with either the G711 or G729 codec. Any suggestions?
I think the problem you are having has to do with the type of trunk you are setting up (when you mentioned intercluster trunk that caught my eye). With CM 3.3 there is a new menu for creating "trunks". The problem is that under it you only have intercluster trunks (which are just for going from Call Manager cluster to cluster) and also gatekeeper controlled trunks.
Make sure you setup the trunk just as if it were an H.323 gateway (under the gateway menu) and that should work for you.
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