[Freeswitch-users] Issue when receiving INVITE with both audio and image (T38)

[Anthony Minessale]

Sure
On Aug 16, 2013 11:14 AM, "François" <fdelawarde at wirelessmundi.com> wrote:

> Thanks for the tip. Should I add a JIRA ticket?
>
> François.
>
> On Fri, 2013-08-16 at 10:00 -0500, Anthony Minessale wrote:
> > We can investigate that,  Meanwhile you could use regex in your
> > dialplan for this situation and set "sip_ignore_reinvites=true" to
> > mitigate.
> >
> >
> >
> >
> > On Fri, Aug 16, 2013 at 8:56 AM, François
> > <fdelawarde at wirelessmundi.com> wrote:
> >         Hello list,
> >
> >         I've seen several gateways (Patton, Audiocodes, Nortel CS2K),
> >         sending
> >         both audio+image (T38) in the initial INVITE. In a simple
> >         bridge
> >         scenario, FS will just ignore the T38 part and setup an audio
> >         connection
> >         only with b-leg.
> >
> >         My issue is later on if/when we receive a re-INVITE (ex: SIP
> >         timers
> >         refresh) with the same SDP (audio+T38), FS now considers it as
> >         FAX and
> >         sends a re-INVITE to b-leg with T38 only! In case the
> >         destination is
> >         voice only, the call hangs up.
> >
> >         ---
> >
> >         Asterisk apparently had the same issue, they solved it by
> >         setting up
> >         both streams on a-leg (RTP + UDPTL). If they receive packets
> >         on UDPTL
> >         they just re-INVITE b-leg with T38.
> >
> >         See: https://reviewboard.asterisk.org/r/208/
> >         Also: https://issues.asterisk.org/jira/browse/ASTERISK-11843
> >
> >         Is this the right way to go? (Also is it feasible in
> >         FreeSwitch)? I can
> >         add a JIRA if necessary.
> >
> >         Thanks,
> >         François.
> >
> >
> >
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> > --
> > Anthony Minessale II
> >
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