[asterisk-users] Digium fax force T38?

[David Backeberg]

On Sun, Apr 26, 2009 at 8:33 AM, Michael <astml at nettrust.co.nz> wrote:
> Is it possible to force T38 for all invocations ReceiveFAX() ?

If it's not T.38, it should instead be audio over G.711 or similar
codec. Are your faxes going through as audio? If not, that's a strong
indication that you have a SIP configuration issue you need to work
through before you worry about T.38.

Are you doing something with a fancy codec like G.729? If so, stop.
You can't fax over G.729.

You should be able to modify your dialplan to record your ReceiveFax()
session and hear exactly what is failing on your audio fax if your
audio fax is failing.