Max,
OpenSER does not get involved with the media stream, it just handles call setup and therefore does not generate FAX tones. It is up to the UAs to negotiate CODEC used for the call. In the example you provided of the call path, both the IP gateway and the PSTN gateway would have to support the T.38 specification. If one side does not support T.38 they will most likely use a normal voice CODEC to handle the FAX tones and FAX tones do not do well when compressed with voice CODECs.
Steve
Max Gregorian wrote:
Hi,
Does anyone know if OpenSER supports T.38 for Fax over IP? Or has anyone managed to get it to work?
I did some quick tests and what I got was the destination Fax machine rang, but the fax message did not arrive. I don't think the destination fax picked up.
Setup was:
Fax (PC modem) -> IP Gateway -> OpenSER -> PSTN -> Fax machine
Is it possible the Fax tones are not being properly generated by OpenSER, and so not being recognised by the Fax machine? (For reference, the Gateway used is advertised as supporting T.38)
Users mailing list Users@openser.org http://openser.org/cgi-bin/mailman/listinfo/users