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Cisco Bug: CSCus21932 - SRVCC Hanged EGTPC Resources on Sv interface when no CS to PS complete

Last Modified

Feb 05, 2017

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

15.0(21)

Description (partial)

Symptom:
The SRVCC failure scenario is the following :
 
1-	PS to CS Request sent to MSC
2-	PS to CS Response received from MSC

3-	Radio Failure happens after the HO Command (id-RelocationComplete message not received by the target RNC after id-RelocationDetect) In this case, we can easily check that EGTP resources are still allocated on MME side while the subscriber is not present anymore on the MME.
show egtpc sessions egtp-service service_name
shows existing sessions even though the subscriber is no longer seen on this MME.

Conditions:
MSC is not sending the PS to CS Complete message after the handover complete.
Subscriber has moved off the MME but the egtpc session on Sv interface remains.
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