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Cisco Bug: CSCui94597 - SIP Connection Manager to add a User-Agent header to the SIP ACK reply

Last Modified

Apr 28, 2020

Products (2)

  • Cisco Unified Communications Manager IM & Presence Service
  • Cisco Unified Communications Manager IM and Presence Service Version 9.1

Known Affected Releases


Description (partial)

Symptom: Lync Server send 500 Internal Server Error because of missing ACK message from IM & P server. 

Conditions: Unique configuration where the SIP presence domain and the SIP Static route next hop address is equal.
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