[asterisk-users] T.38 troubles

[Steve Underwood]

Hi Jean-Denis,

Your log shows the Mediatrix GW has problems. It sends a DCS signal to 
the Asterisk box, but doesn't following it with TCF as it should. The 
asterisk box times out waiting for TCF and tries to take recovery action 
which fails.

Spandsp has some workarounds for bugs in Mediatrix boxes. They usually 
work OK.

Regards,
Steve


On 03/27/2012 08:02 AM, Jean-Denis Girard wrote:
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> Hi list,
>
> I'm having difficulties when receiving faxes from the PSTN with this
> relatively simple installation:
>     PSTN<--PRI-->  GW<--T.38-->  Asterisk
>
> The gateway is a Mediatrix 3301 (firmware Dgw 2.0.14.251). It's
> configured to transmit faxes as T.38. I may have missed something in its
> configuration, but it does switch to T.38 when a fax is detected. On the
> Asterisk side, I'm using 10.2.1 with spandsp-0.0.6-pre20 and ReceiveFax
> from res_fax_spandsp. ${FAXSTATUS} returns FAILED and ${FAXERROR}
> "Disconnected after permitted retries".
>
> I did a network capture, attached to this mail: from my understanding,
> T.38 is accepted by Asterisk, then there seems to be some UDPTL traffic,
> which I don't understand...
>
> Why does it fail, and what is wrong? I'd appreciate if someone could
> send me advice / suggestions.
>
>
> Thanks,
> - - --
> Jean-Denis Girard
>
> SysNux                  Systèmes  Linux  en Polynésie française
> http://www.sysnux.pf/   Tél: +689 50 10 40 / GSM: +689 79 75 27
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> --
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