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

[Anthony Minessale]

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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