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Cisco Bug: CSCut46615 - Ucm does not respond back to an INVITE request

Last Modified

Jul 06, 2017

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases

10.5(2.10000.5)

Description (partial)

Symptom:
Call drop seen for a SIP to SIP call due to SIP signal racing

Conditions:
SIPPh1------UCM-------------SIPPh2

Intial call setup fine.
Due to session expiry/ security update, CUCM sends re-invite to SIP Ph2 
Before the Answer from SIP Phone 2 reaches SIP Phone 1 side, New offer triggered from SIP Phone 1
resulting in race condition.
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