Cisco Bug: CSCus91423 - Incorrect port sent by CCM for early offer causes one way audio
Mar 05, 2018
- Cisco Unified Communications Manager (CallManager)
Known Affected Releases
10.5(1.10000.9) 10.5(2.10000.5) 8.5(1.10000.26) 9.1(2.10000.11)
Symptom: In the following call flow the egress SIP Trunk uses early offer SCCP IP Phone--- CUCM ---SIP--- CUC (IVR) The Caller (SCCP IP Phone) selects IVR menu option ---> REFER to external phone number Final call flow is: SCCP IP Phone --- CUCM ---SIP--- GW ---ISDN--- PSTN The SCCP phone does not get audio after the redirect. CCM is sending a new Invite after the refer with the port that was received in the port response for the initial call setup. CUCM then sends an ORC to the phone & the phone responds with a new port. Once it gets the new port number from the phone, SIP signaling does not update or re-invite using the new port. Therefore, audio is never connected bidirectionally between the phone and the ISDN GW after the REFER. Conditions: The egress SIP trunk uses early offer.
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