[Freeswitch-users] T38<>T30 transcoding

[Brian West]

We do not support fallback.

On Fri, Jul 15, 2016 at 9:14 AM, Mirko Brankovic <mirkobrankovic at gmail.com>
wrote:

> Hi,
> Seems to me that I'm not configuring something correctly or hitting some
> bug.
> Reading https://wiki.freeswitch.org/wiki/Mod_spandsp#t38_gateway
>
> I have a T.38 incapable provider that will respond with SIP 488 back.
> If I leave T.38-passtrough and get 488 back, RTP stops and call is
> dropped. So I was trying to set up correct transcoding.
>
> This is the scenario, with 3 identical FS:
> 1 - T.38 incapable server - PROVIDER
> 2 - T.38 capable - PROXY
> 3 - T.38 capable - PBX
>
> PBX sends txfax (file.tiff) to PROXY which forwards call to PROVIDER
> (g.711).
> PBX sends T.38 re-Invite, PROXY responds with 200 OK but then I have 2
> scenarios: either passtrough T.38 which will invoke 488 and dropped call or
> I tried
>
> sip_execute_on_image=t38_gateway peer nocng"
>
> but this doesn't send anything to PROVIDER but also call is dropped after
> BYE and 486 message.
>
> Case that I'm hitting is similar to this:
>
> "If you want to transcode t.38 on leg a to audio on leg B when leg a
> invites t.38, but refuse all t.38 offers from leg b "
> but to refuse t.38 invites from lag a.
>
> The other way around, call from PROVIDER to PBX over PROXY is easely
> transcoded with
>
> sip_execute_on_image=t38_gateway self nocng"
>
> on the PROXY side.
>
>
> Is it normal behaviour that After failed t.38 negotiation or 488 message,
> fax call doesn't fall back to previous codec or t.30?
>
>
> --
> Regards,
> Mirko
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://confluence.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org
>



-- 

*Brian West*
brian at freeswitch.org


*Twitter: @FreeSWITCH , @briankwest*
http://www.freeswitchbook.com
http://www.freeswitchcookbook.com
https://www.gofundme.com/freeswitch_ubuntu

Got Bugs? Report them here <https://freeswitch.org/jira>! | Reddit:
/r/freeswitch <https://www.reddit.com/r/freeswitch>

*T:*+19184209001 | *F:*+19184209002 | *M:*+1918424WEST (9378)
*iNUM:*+883 5100 1420 9001 | *ISN:*410*543 | *Skype:*briankwest
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20160715/14a39f5b/attachment-0001.html