Guest

Preview Tool

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

9.8(1)P15

Description (partial)

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

Conditions:
PSTN—ss7—PGW---sip—SBC—sip—client
                             |
                        MGX

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.
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.