21 Jan
2007
21 Jan
'07
4:54 a.m.
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)
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