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Disconnect calls after three minutes on Phone 6921

                   We use CUCM 7.1.5 and Cisco Phone 6921 (CCP69xx.9-3-1-3). We have problems with outgoing calls via SIP trunk (gateway cisco 2811 IOS Version 12.4(24)T3, RELEASE SOFTWARE (fc2)). Calls were droping after three minutes due Reason: Q.850;cause=86

I have made debug ccsip message

Received:

BYE sip:+XXXXXXXXX@XXX.XX.XX.XX:5060;transport=tcp SIP/2.0

Reason: Q.850;cause=86

Date: Tue, 07 Aug 2012 08:08:08 GMT

From: " 3650" <sip:442030516708@XXX.XX.XX.XX>;tag=556209fc-88ac-4059-ab16-bd32afb0e4d3-22381927

P-Asserted-Identity: " 3650" <sip:442030516708@XXX.XX.XX.XX>

Content-Length: 0

User-Agent: Cisco-CUCM7.1

To: <sip:XXXXXXXXX@XXX.XX.XX.XX>;tag=4C4FB10C-CCB

Call-ID:

96d37d80-201cc30-3d0c-a61a8c0@192.168.97.10

Via: SIP/2.0/TCP XXX.XX.XX.XX:5060;branch=z9hG4bK277f9315c79e2

CSeq: 105 BYE

Max-Forwards: 70

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