Cisco Bug: CSCtb32339 - CUCM SIP stack is not sending 491 Request Pending to dialogue originator
Feb 07, 2017
- Cisco Unified Communications Manager (CallManager)
Known Affected Releases
Symptom: Rare condition where CUCM SIP stack will encounter a Glare condition due to timing and not send the 491 Request Pending message back to the INVITE originator. As a result, the originator is not aware of the 491 message and there fore cannot set its retransmission timer appropriately as per spec. This results in a "stuck" state for the dialog and the call is dropped. Conditions: SIP INVITE received for an active dialog with Contact field identifying different IP address for CUCM to send messaging to. This has to occur while a pending request is in place for the Dialog.
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Bug Details Include
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