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Cisco Bug: CSCtb41812 - CUCM mid-call H.323 capabilities re-negotiation exposes race condition

Last Modified

Feb 22, 2014

Products (3)

  • Cisco Unified Communications Manager (CallManager)
  • Cisco Unity Connection Version 7.1
  • Cisco Unified Communications Manager Version 7.1

Known Affected Releases

6.1(3) 7.1(3)

Description (partial)


Calls between H.323 endpoints and CUCM may be dropped during mid-call capabilities exchange (codec negotiation).  CUCM will initiate the disconnect by sending cause 47 (resources unavailable, unspecified) to both endpoints of the call.


Seen in CUCM 6.1(3) with fax calls between a 3rd party H.323 device and an Cisco IOS router using H.323.
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