[asterisk-users] Asterisk 1.4 Fax

[Jonn R Taylor]

Steve,

One of the main reasons that this works is controlling the data to and from the internet. I have spent the last 10 years building networks for ISP's. The key is getting the data from point a to point b in tact and in order. 

I did not get "lucky" as you put it. I am a network engineer and I know how to make networks work the way they need to.

Jonn

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Steve Underwood
Sent: Tuesday, January 01, 2008 6:02 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] Asterisk 1.4 Fax

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


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