2016-05-03 16:43 GMT+02:00 Matt Fredrickson <[email protected]>: > On Fri, Apr 29, 2016 at 1:34 AM, Olivier <[email protected]> wrote: > > Hello, > > > > I'm helping a colleague (*) which has the following setup: > > > > ITSP --- <T.38 capable PJSIP trunk> --- Asterisk 13 --- <PJSIP>-- > > Audiocodes MP-112 --- <FXO/FXS> --- Fax machine > > > > My issue is the following : > > Audiocodes gateway reject INVITEs with 488 Not Acceptable Here > > > > It seems this gateway requires t38 settings to be present in SDP body in > the > > very first INVITE. > > > > My questions are the following: > > > > 1. I expected T.38 to exclusively work with reINVITE where calls are > > established as normal voice calls (PCMA/PCMU in SDP, for instance) and > then > > upgraded to T.38 (when CNG is detected, for instance). > > Have you ever heard of T.38 sessions being established right from the > start > > (ie with T.38 settings in the first INVITE) ? > > No. It would seem to be extremely broken if it denies a call based on > a lack of T.38 sdp parameters on the initial INVITE. >
OK > > > 2. Is it possible to configure Asterisk to pass T.38 settings in SDP in > the > > first INVITE it sends ? > > > > 3. Any suggestion with Audiocodes gateway ? > > Look for T.38 settings maybe? See if there is something keeping you > from sending an initial invite with non-T.38 SDP....? > Yes, I think issue must come from incorrect Audiocodes settings. Requiring T.38 settings within first INVITE seems very unusual. Thank you very much for replying > > -- > Matthew Fredrickson > Digium, Inc. | Engineering Manager > 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > New to Asterisk? Join us for a live introductory webinar every Thurs: > http://www.asterisk.org/hello > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >
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