Question about VOIP and Faxes

[Ori Berger]

Dear Linux-IL,

I've been using asterisk, a pstn->sip DID (didww) and a sip->pstn 
termination (grnvoip) for the last year, and it's been working very 
well. I'm about to purchase[1] an Epson Artisan 810, which can also work 
as a Fax, and I would like to put it to that use. (Oh, and I'm located 
in the US)

 From what I've been able to gather, didww say they do not support T.38 
(voip fax protocol); grnvoip do support T.38; Faxes may still work 
through a voice codec if bandwidth is high enough; Which means I might 
have problem receiving faxes, although no problem sending faxes to PSTN 
numbers.

Does anyone on this list have experience with using FAX through voip?
* Which provider would you recommend for did or termination?
* Are there any alternative recommended services (mail-to-fax, 
fax-to-mail) that don't cost an arm and a leg? (I pay $3/month for a 
phone number, and <1c/minute for termination; so, e.g. a $20/month fax 
service IS expensive).
* Any other Asterisk/Printer/etc. configuration tips you have?

Thanks in advance,
Ori

[1] provided I manage to print to it in the store before buying. There 
are drivers for linux here 
<http://www.avasys.jp/lx-bin2/linux_e/spc/DL1.do>, there was only one 
reference on the whole web I can find to anyone trying this printer with 
linux, and for some reason they were not successful.