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Cisco Bug: CSCvs54640 - SIP Phone plays ringback tone and displays as Busy in Secure/None Secure Calls

Last Modified

Jan 21, 2020

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases

11.5(1.7)

Description (partial)

Symptom:
Phone plays ringback tone instead of busy tone whenever we receive 183 session progress followed by 486 for the Delayed Offer sent out.

Conditions:
When we send out a Delayed Offer to side B.
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