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Cisco - Nortel calls disconnecting intermittently

Dear All,

I have Cisco - Nortel PBx interconnected Via SIP Trunk using CUBE. CUCM Publisher 7.1.3 located at HQ and the nortel pbx at Branch site is connected via MPLS. The issue I am facing now is sometimes when a call made between these two PBXs, we are losing the audio in the middle and call goes mute. Either the call will disconnect in 1 or 2 minutes or the audio comes back.

I have attached the trace files herewit and the called/calling details are given below. Please help me in this matter.

Nov 28, 2011 01:38:39 PM to  Nov 28, 2011 01:39:18 PM from Nortel 86465 to Cisco 6782993993

Nov 28, 2011 01:47:34 PM to  Nov 28, 2011 01:50:03 PM from Nortel 86465 to Cisco 6782993993

Nov 28, 2011 04:16:07 PM to Nov  28, 2011 04:16:44 PM from Nortel 86465 to Cisco 6782993993

Note: No packets drops observed between these phones during the call.



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