[asterisk-users] T.38 fax solution, opinions?

[arkda]

Hi,

I'm putting together a fax solution for my company that utilizes T.38. I
wanted to throw out my plan and get some feedback if anyone is doing
something similar or sees a blatant problem with it.

We're currently rolling out SPA-942 phones for the standard desk phone with
vanilla Asterisk 1.4.15 (just upgraded it today) on the back end. Most calls
for satellite offices are handled by VoIP providers (for voice Vitelity
inbound, Gafachi outbound). These satellite offices are using a T.38 fax DID
from Gafachi, passed through the Asterisk server to a Linksys 3102 ATA and
then to a POTS fax machine. This all works well thus far.

Our HQ has a full voice PRI, terminated on the Asterisk server with a
TE120P. Additionally, right now they have five fax lines totally separate
from the PRI that are used for POTS fax machines.

I'm thinking of porting those numbers to the PRI and purchasing a TDM880B
(comes with eight FXS modules) and routing the fax DIDs to the 880 in
Asterisk. Five of the ports would connect into a Linksys 3102 that would
speak T.38 to what would be our new fax environment (Exchange 2007 Unified
Messaging). That part isn't implemented yet, but it shouldn't be a problem.
Once it's implemented I'll probably reroute the Gafachi T.38 fax DIDs to
Exchange through Asterisk (with sipX in there somewhere).

The part(s) I'm unsure about is the TDM880B. I haven't used a FXS card with
Asterisk, and I certainly haven't used a fax machine on that FXS.
Additionally, I'm not 100% sure the 3102 will talk directly to Exchange UM
yet, but that's something I can figure out myself soon; I'm just not sure
about spending the cash for a TDM880B without knowing someone has thrown
faxes through it from a PRI terminated on the same box from a separate card.

Anyway, thoughts, criticisms, insults and stinging barbs all welcome.
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