[asterisk-users] FAX using T38

[Mehdi chouikh]

Hello
Asterisk implement only passtrough T.38, so you cant terminate calls with
asterisk using T.38.
You need T.38 gateways.

Regards


On 11/13/06, Ricardo Carvalho <rjcarvalho at reit.up.pt> wrote:
>
> Dear all,
>
> I'm trying to enable Asterisk to work with FAX using T38. I've tried
> Asterisk 1.2.4 with the available patch found at URL
> http://bugs.digium.com/view.php?id=5090 and also with the new 1.4 Beta3
> that is announced to support it too.
>
> With both Asterisk versions, I've sent with success FAXes between two
> FAX machines each one attached to an ATA interface, both registered in
> Asterisk. Although I can't send FAXes to PSTN using T38. The problem, as
> far as I know, might be assigned with the "Content-Length" shown in the
> message header of every SIP message negotiating T38 parameters. I've
> observed that after leaving Asterisk, the Content-Length of every
> message carrying T38 parameters gets shorter than truly is, and
> contrarily to my ATAs that seem to don't care about this, my Telco
> analyses the packet length written in this messages and truncates them,
> aborting the call.
>
> Does anyone experienced this too? Any ideas besides editing the
> chan_sip.c code to fix this problem?
>
> Thanks,
> Ricardo.
>
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