Re: [Asterisk-Users] Best codec for faxes?

[Steve Underwood]

steve szmidt wrote:
On Tuesday 02 November 2004 08:18 pm, Julio Arruda wrote:
 

Steve Underwood wrote:
   

 

'replace' fax over G.711 by fax over G.711 over IP :-)
The point being, Fax over VOIP (even using G.711), I don't believe would
be as reliable as Fax over an ISDN b-channel :-) Better now ?
   

You're totally right. The advantage of ISDN is lost, from a fax viewpoint, 
largly because the unwieldly Internet don't care about lagging packets etc.

Point to point ISDN is a great dedicated circuit. But it ain't that no more 
once you connect it to the Internet. 
 

Yes and no. Across the Internet even a G.711 FAX is unpredictable. 
However, people often get perfectly good results on lightly loaded LANs. 
It still isn't perfect, as a urst of data on the LAN can still upset 
things, but some people get results they can live with.

Steve
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Re: [Asterisk-Users] Best codec for faxes?

[Julio Arruda]

Steve Underwood wrote:
Julio Arruda wrote:
Roger Schreiter wrote:
Matthew Boehm schrieb:
I'm not using asterisk as the fax machine a la rxfax and the like. 
I'm
using an ATA (linksys, grandstream, etc) plugged into a fax machine. 
I know
not to use 729 for faxing. Which 'should' I use?
...

Hi,
use G.711, and you'll have ISDN quality!
Tradidional analog adaptors for ISDN do the same,
and (analog) faxing over ISDN is working fine, isn't it?

I would expect FAX over ISDN to work better than fax over G.711 on 
some networks.
ISDN doesn't have the jitter/packet loss of IP networks (unless you 
control the whole path or has some nice SLA :-)). The price being, is 
a circuit switched technology.

Clue: G.711 is the codec used over ISDN :-)
Ok, now I understand why you mentioned that common codec, let me clarify 
my remark (I can blame on english not being my native language I guess 
:-)..,
'replace' fax over G.711 by fax over G.711 over IP :-)
The point being, Fax over VOIP (even using G.711), I don't believe would 
be as reliable as Fax over an ISDN b-channel :-) Better now ?

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