[asterisk-users] Asterisk 1.6 T38 to G711 transcoding is this possible?

[Matt Watson]

On Sat, Jan 17, 2009 at 11:51 AM, Steve Gladden <
asterisk at michiganbroadband.com> wrote:

> The scenario we have is fax send/recieve software that ONLY talks T38
> and an asterisk box.
>
> We have ITSP providers that do NOT talk T38 but G711 only.
>
> Does asterisk have the capability to take the T38 call from an ATA
> or T38 software then bridge/transcode it and do G711 out to the PSTN
> providers?
>
> If not is there another product PAID or FREE software or hardware that can
> do this easily and reliably?
>
Even if you find something that claims to be capable of doing this, it will
not work reliably.  T.38 is a protocol designed specifically to overcome the
challenges of faxing over IP networks.  Without it, depending on how good of
a network and route you have to your ITSP, your results will either be:

A) won;t work at all due to unpredictable network connections
B) Will work "sometimes" "occasionally" "most of the time" - all of which
are not suitable answers in an business environment. It will almost
certainly never be "works flawlessly"

In short, you cannot fax reliably over IP without T.38... you might want to
get an additional ITSP account with another provider and use it strictly for
faxes.  I;m sure there are lots that support T.38, but the only one I know
that a friend uses is Gafachi.  Your other option is to get a POTS line into
your * box, in which case (I believe) Asterisk 1.6 has the ability to act as
a T38 Gateway for this purpose.  It does not exist without 3rd party modules
for 1.4 I believe though... unless somebody has backported all the new T.38
stuff in 1.6.

--
Matt
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