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Cisco Bug: CSCul90883 - One-way audio call happens when CCM service is stopped in H.323 ICT call

Last Modified

Nov 27, 2020

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases


Description (partial)

Call Preservation does not work fine then one-way audio happens when SDL Link Out of Service is detected.

The issue happens with calls through Gatekeeper or non-Gatekeeper ICT.
Here is an example of an environment that it is seen:

Call Flow:
IP Phone A ---- CUCM#1(*) ---- CUCM#2 ---- Gatekeeper or non-Gatekeeper ICT ---- CUCM#3 ---- CUCM#4 ---- IP Phone B

Service parameter : 
Allow Peer to Preserve H.323 Calls is TRUE

1. IP Phone B places a call to IP Phone A and the call is established. 
2. Stopping CCM Service on CUCM#1(*) for testing. 
3. CUCM#2 detects SDL Link Out of Service and sends CloseLogicalChannel to CUCM#3.
4. One-way audio issue is seen on IP Phone B side. 
      IP Phone B cannot hear audio from IP Phone A.              <<<<<< Strange behavior
      IP Phone A can hear audio from IP Phone B.
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