[Asterisk-Users] Which asterisk-friendly cards are fax-capable?

[Lee Howard]

trixter http://www.0xdecafbad.com wrote:

>There is very little info on the sf.net page regarding its
>capabilities ...  
>  
>

Right now that's intentional.  I still consider it "developer-grade" 
code.  That said, I do use it on small production usage, and it's fine 
there with a few known issues that I'm working on that probably won't be 
of consequence to most.

>Does it only do fax or does it do other data communications?  
>  
>

Only fax.

>What fax protocols are supported?  
>  
>

Class 1 and Class 1.0 - V.27ter, V.29, and partial V.17 (all as provided 
by spandsp - Steve's working on the V.code and I'm working on the T.code).

>Does the destination path from asterisk->whatever need to be iax or will
>asterisk properly translate to a different medium (eg presumably
>iaxmodem does iax to asterisk, then from asterisk does it matter if you
>use sip, zap, h.323, whatever ?)  I cant see where it would matter once
>it hits asterisk, but stranger things have happened ...
>

IAXmodem doesn't care what the channel type is beyond Asterisk.  
Realize, though, that for most usages I recommend running IAXmodem on 
the same system as Asterisk, and that's to avoid any audio corruption 
that would normally occur (even in minute amounts) when passing over a 
UDP/IP network.  So unless you're running your SIP or H.323 fax endpoint 
also on the same system or have somehow managed to prevent any audio 
corruption (jitters, etc... you should know that caveat) along that 
path, then the answer to the question is Zap is what you *should* use.  
You can try other things, but you'll most likely just be wasting your time.

Lee.