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Cisco Bug: CSCta68310 - CM should be able to choose between G711 companding on intercluster SIP

Last Modified

Jul 17, 2017

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases


Description (partial)

CM should be able to choose between G711 companding on intercluster SIP trunk
When a SIP audio media are negotiated for a G711 call on a callmanager to callmanager  SIP trunk, the chosen companding is always U-law due to the order of the codecs in the SDP. It would be more beneficial in some circumstances to choose G711 a-law. Below is an example


The original call from the phoneA to a phone CM1 is A-law, this phone then transfers the call to a phone on CM2 the call across the SIP trunk is U-law.  Finally the call is transferred to phone B, this path uses A-law

So finally we have,  A-law—U-Law---A-law, with transcoding taken care of the differences. This may not be optimum use of resources and if A-law could have been chosen for the intercluster  trunk it would be more efficient
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