[asterisk-users] Asterisk 1.4 Fax

[Steve Underwood]

Jonn R Taylor wrote:
> I have always said that if some one said it can't be done, they did not try hard enough.
>
> FYI... I love this.
> Ben Franklin quote:
>
> "Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety."
>   
As the person behind the tools you are relying on, I can say you haven't 
tried hard at all. You are just lucky, and almost certainly just being 
very reliant on the majority of your FAXes using ECM mode, and retrying 
a lot.

Trying hard for FAX over IP means implementing T.37, or at least T.38. 
These are engineered solutions, not pot luck. Your present arrangement 
assumes G.711 (not available a lot of the time), no signal manipulation 
in the system beyond your controls (getting rarer and rarer), a very 
crude network doing nothing to improve voice quality (should be getting 
rarer too), limited packet loss (which is truly pot luck over the 
internet, which you say you use), and a few other magic qualities.

A number of people claim solid FAXing results across VoIP paths, like 
they've achieved some engineering breakthrough. The claims tend to 
evaporate under closer inspection.

Steve