[Asterisk-Dev] Fax detection, handling and bridged calls?

Marc Olivier Chouinard mochouinard at m0c.com
Wed Jan 28 19:36:00 MST 2004

Mark fixed the FAX detection thing recently into the CVS, did you apply the
patch for it ?
----- Original Message ----- 
From: "john harragin" <jharragi at mw.k12.ny.us>
To: <asterisk-dev at lists.digium.com>
Sent: Monday, January 26, 2004 4:29 PM
Subject: [Asterisk-Dev] Fax detection, handling and bridged calls?

> I've been getting echo on bridged calls with echocancelwhenbridged=no. It
> appears that many of my toshiba pbx (connected with an em_w T1) calls are
> being detected as fax calls. 'Fax Detected, but no fax extension'. In
> 'zap show channel' 'echo cancellation' is indeed off - but 'Fax Handled'
> is yes. This is introducing some pecular echo.
> I have not yet determined why this is happening - I have some centrex
> trunks on the pbx. Perhaps it is sending * some centrex stuff that is
> being interpreted as fax tones. I'm still looking... but this behavior
> still leads to some questions.
> I suspect 'fax handling' should probably bi-pass on bridged calls with
> echocancelwhenbridged=no - but as a non-user of this feature, I'm not
> sure what all of the benefits are. Whatever, it seems that nothing good
> can come from adding delay to a psudo-tdm fax call. In this case the call
> should merely be routed to a fax extension if desired. Am I overlooking
> something?
> Anyway, in this particular case, it would be fine to disable fax
> detection & handling completely. Can this already be done?
> John
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