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Cisco Bug: CSCut67984 - 894X Phones SIP signaling Delayed in SIP SRST

Last Modified

Jan 31, 2017

Products (1)

  • Cisco Unified IP Phone 6900 Series

Known Affected Releases

9.4(2)SR1 9.4(2)SR2

Description (partial)

894X phones when they fallback to SIP SRST, will delay any SIP signaling that comes to/from the phone every 120 seconds causing call setups and call disconnections to be delayed.

894X IP Phones using SIP
Phones registered to SIP SRST after a network or CUCM server failure.
SIP SRST configured in a Cisco Router. 
Make sure phone will lose connectivity completely to CUCM. Shutting down CUCM Service is not valid. The CUCM Cluster has to be completely down or unreachable.
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