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<div>I have integration between Nortel CS 1000 running release 5 and CallManager 4.2 sr4 , I am able to make calls between Nortel and Cisco Ip phones. The issue occurs when ever a call between two nortel phones is transferred to a cisco IP phone over the SIP trunk , I have no audio between Cisco and Nortel. I am using G711 codec over the SIP trunk. The Cisco IP Phone rings and the call is established but have no audio either side. I can see the SIP invite message and ACK messages in the CCM trace but not sure what I am missing here. </div>
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<div>TIA</div>
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<div>Aman</div></div>