[Asterisk-Users] FAX over PRI

[Michael Gaudette]

Roger,

Thanks a lot for this very detailed and pertinent answer.

Mike 

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Roger
Schreiter
Sent: March 21, 2006 5:33 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] FAX over PRI

Michael Gaudette schrieb:
> I've been warned many times that Fax over VoIP is unreliable.  
> 
> How should I consider Fax over PRI channels with Asterisk?  Is the 
> quality and reliability good, or should I be prepared for alot of grief?


Hi,

we tested faxing a lot. With spandsp (app_rxfax/txfax) we had very reliable
results, as long as only one or two simultanious faxes were transmitted or
received.

Than we bought a commercial DSP software, which is, according to the
manufacturer, capable of sending or recieving up to 100 faxes simultaniously
on a high perfomance machine.

Well, we tested with a dual Pentium machine, not considerable as high
perfomance machine, but we expected anyway good results.

We could drive up to 30 fax sessions at once using a TE405 Digium card
(Asterisk-1.0.10) without notable errors, more fax sessions at once showed a
slightly increasing error rate. CPU usage was about 20% (80% idle time
average).
(We've sent in total 15000 faxes in order to get reliable mean values about
the error rates.)


Roger.

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