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Cisco Bug: CSCsy81095 - Wrong CAC bandwidth allocated for IPv6 calls with SIP trunk and MTP/XCOD

Last Modified

Jul 06, 2017

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases


Description (partial)

The bandwidth allocated by the locations-based call admission control
(CAC) feature may be incorrect for calls over an IPv6-only SIP trunk
when a Media Termination Point or transcoder are involved in the call.
This could result in a location exhausting allocatable bandwidth 
before the physical bandwidth is exhausted.


For calls over IPv6-only SIP trunks requiring a different codec (for
example, G.729) than those within a Cisco Unified Communications Manager 
cluster (for example G.711), a transcoder will be inserted between the 
originating phone and the terminating cluster.  In this case, the 
Communications Manager will incorrectly subtract the bandwidth for a 
call using G.711 instead of the bandwidth for a call using G.729 from
the available bandwidth defined for the trunk location.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
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