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Dropped Incoming calls after 20 seconds, Reason: Q.850;cause=86

I have the following scenario for incoming calls:

 

PSTN ---- E1 ---> Digium Gateway --- SIP ---> Router 2921 ------SIP ----> CUCM

 

All incoming calls from the PSTN get dropped after 20 seconds. All outgoing calls to the PSTN work fine..

The Router 2921 generates a BYE message with Reason: Q.850;cause=86 to the Digium Gateway.

Attached is the debug, show run and a packet capture with all the SIP messages..

If someone could please give me to a solution.

Thanks!

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