I have Fax server (Faxcore) Using Dialogic SR140 v6.11.
the FaxServer connected to Asterisk pbx 11.9.0
When sending faxes to some providers , after the invite (fax serever), the PBX sent “183 Session Progress SDP (g711A)”, our response to this is “CANCEL”
Why in some calls the PBX send the "183 Session Progress SDP (g711A)?
Where should be the change? The fix? On the Dialogic configuration? In the Asterisk pbx?
The dialogic is configured with T.38 with Fallback to G.711 and codac - ALaw/ULaw