[cisco-voip] SIP trunk one way audio

[Bill Riley]

I have a new SIP trunk terminating in a 2921 CUBE bundle. When I call in
from the Trunk directly to an IP phone it works correctly. If I call from
the trunk to IP phone and the IP phone transfers the call without waiting
for the remote party to answer I get one way audio. From reading this looks
like and MTP issue but I have an MTP set in the MRGL for the trunk. 

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