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Cisco Bug: CSCuj09195 - PGW2200 Fax T.38 fails after negotiation

Last Modified

Feb 08, 2017

Products (1)

  • Applications for Cisco Unified Application Environment

Known Affected Releases


Description (partial)

T.38 call fails in an ISUP to SIP call through PGW.
.FaxUpspeedCodecPreference = null in XECfgParm.dat


1.	The first invite is a normal one with m=audio and codecs and acked by PGW.
2.	The second invite with m=image having a new sdp and t.38 parameters is acked by PGW fine.
3.	The third invite having the same sdp and m=image parameter arrives but the 200 OK is different with m=audio, leading to a different offer-answer state, hence ending the call.
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