[asterisk-users] ReceiveFax to G.711

[David Backeberg]

On Mon, Jun 27, 2011 at 9:06 AM, Michael <voip.question at gmail.com> wrote:
> Hi Kevin,
>
> Controlling it through the sip.conf peers is sufficient for us for this case
> (because this particular provider doesn't support T.38 at all), but I think
> it would be a good idea to add the option to enable/disable T.38 from the
> dialplan. If I recall correctly, that's how callweaver worked at the time.
>
> Also, we just checked it, and since for that provider, we have other codecs
> in higher priorities (like GSM, for example) than G.711, G.711 was not
> chosen as the only codec, so the fax transmission failed. We can not
> prioritize G.711 over the other codecs in the sip.conf, for the obvious
> reasons, so for this, we need to do it in the dialplan. How can we do it?

Obvious solution is to move this particular number off this particular
provider to a provider where you don't require prioritizing GSM and
where that provider properly supports T.38.

Outside of that idea, you would have to do some edge SIP routing
before the call hit asterisk, to deflect this particular call to an
asterisk configured differently. You could do that with OpenSIPS for
example. Doesn't that sound like a lot more work than just porting the
number to a different provider?

Or if you insist on keeping the provider, get a second account with
them for just this number, and you can apply different rules in
sip.conf for just that account.