Courtesy callback is not offered, when EWT in the ICM is set more than 30 minutes

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Problem Summary Courtesy callback is not offered, when EWT in the ICM is set more than 30 minutes.

Consider the following scenario:

When a TDM caller makes a call, a callback is offered and accepted. The callback is initiated and the caller answers the call. After 250-260 sec the callback entry on the Reporting Server portal gets erased and as a result no Courtesy Callback is offered.

Possible Cause When EWT in the ICM is set more than 30 minutes, the callback entry on the Reporting Server gets erased and as a result the Courtesy Callback is not offered. This is because the Gateway terminates the VRU leg by sending BYE which Unified CVP uses for any callback. As a result, Unified CVP erases all call details of the call and as result the callback is not made. It is found that a possible SIP session time out causes this behavior.
Recommended Action The following configuration has to be made on the Ingress gateway/CUBE:
 voice service voip
sip
min-se 7200 session-expires 7200                                                                                             
Note In addition to the above configuration the session expire in the CUCM should also be changed to a higher value (7200), otherwise the callback will fail in Unified CVP due to SIP error response 422(session expire value too low) from Gateway.
Release Release 9.0(1)
Associated CDETS # CSCua18769

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