Disclaimer: Yes, I know faxing over G711 is unreliable. :-) We're running Asterisk 1.0.9 which talks to a Audiocodes SIP Gateway. We're running Sipura SPA-2002's as ATA's and faxing within our own voice network is working. If we try and fax out to the world however, we're running into a problem.
When the call connects and the modem tones begin to negotiate, our SIP/PSTN Gateways's SIP server determines it's a fax call and sends an INVITE to our Asterisk box asking us to negotiate T38. To this, Asterisk replies with a 488: Not acceptable here message. There is no SDP payload in this 488 message. The SIP/PSTN gateway sends an ACK to this. At this point, nothing happens. Eventually Asterisk gets bored and sends a BYE to the SIP/PSTN gateway and the call ends. Our SIP/PSTN gateway provider seems to think that Asterisk should initiate a renegotiation to G711 when it sends the 488 message rejecting T38. Is this how it should work? I've asked them to look into disabling T38 support for us completely, but it seems like Asterisk and the SIP/PSTN gateway should be able to negotiate G711, I just don't know what the proper sequence of events should be. Any ideas? Ray _______________________________________________ --Bandwidth and Colocation sponsored by Easynews.com -- Asterisk-Users mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
