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Cisco Bug: CSCuo35952 - 180 Ringing is not forwarded by cucm in certain cases

Last Modified

Oct 27, 2017

Products (7)

  • Cisco Unified Communications Manager (CallManager)
  • Cisco Intercompany Media Engine
  • Cisco Business Edition 5000 Version 9.1
  • Cisco Unity Connection Version 9.1
  • Cisco Business Edition 6000 Version 9.1
  • Cisco Unified Communications Manager Version 9.1
  • Cisco Unified Communications Manager Session Management Edition

Known Affected Releases


Description (partial)

If CUCM recieves 183 session progress and responds with PRACK and establishes early media. If it's followed by an UPDATE/200 OK which sets media to a=inactive. Effectively both Parties involved in the call have stopped sending/recieving RTP stream.

Then a 180 Ringing is recieved. CUCM still thinks that the EARLY MEDIA session is active and does not forward it to the LEAF cluster in SME environment.

Early media cut through followed by UPDATE which sets media to inactive.
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Bug Details Include

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