[asterisk-biz] SIP Fax OK?

[Andrew Joakimsen]

On 8/6/07, Matthew Rubenstein <email at mattruby.com> wrote:
>         According to Xorcom's press release advertising their reliable Asterisk
> Fax/ZAP solution
> ( http://www.xorcom.com/documentation/white_papers/fax_modem ), the
> problem Asterisk has with mediating faxes is Zaptel timer desync
> problems. So does that mean that Asterisk can reliably receive and send
> faxes when connected to the PSTN by SIP (or IAX) to a gateway switch?
> --
>

Yes, if all the SIP endpoints support ITU-T Recommendation T.38. The
problem is there is no such thing right now in Asterisk and no plans
by Digium to add it.

If you have a SIP provider supporting T.38 then you can have calls
from your T.38 capable devices forwarded to that provider, but you
must use Asterisk 1.4 and pray it works.