[asterisk-users] res_fax

[Steve Underwood]

On 01/21/2011 08:37 PM, Tom Rymes wrote:
> On Jan 20, 2011, at 8:52 PM, Steve Underwood wrote:
>
>> A comparison wouldn't be complete without mentioning Hylafax. Hylafax has a great infrastructure - tools for integrating with Windows clients, and so on. Neither spandsp or the Digium FAX code can match that for FAX termination. I think its biggest drawback is you either use it with iaxmodem for audio FAXing, or t38modem for T.38 FAXing. It can't smoothly integrate the two right now.
> As a longtime Hylafax user, I can confirm it's an excellent solution. I am somewhat surprised about the comment of being able to do audio or t.38, but not both. This is probably a little true and untrue at the same time, though I have never used t.38modem with Hylafax.
>
> Given the structure of the product, you could have HylaFAX connected to both an IAXModem and a T.38Modem at the same time (or 23 IAXModems, a 24-port T1/E1 PCI-card modem, and 7 t.38modems for that matter...). What it cannot do, is receive audio and t.38 on the same port, which is what I presume that Steve was referring to. This is really a limitation of IAXmodem and t.38modem, as one only handles audio, the other only handles t.38.
>
> In other words, you could route t.38 faxes to it on port 1 and audio faxes on port2, but you cannot have port 1 handle both types.
Its easy to set up some t38modem channels and some iaxmodem channels for 
receiving FAXes. Transmit is more problematic. With this split config, 
you need to know in advance whether the particular number is accessible 
by T.38 or by audio. Most people won't.

Steve