[Asterisk-doc] (Fwd) Re: [Asterisk-Users] Fax Detection

[Philipp von Klitzing]

Hi there,

I think this little piece of info deserves a place in the book. This 
explains why a "fax" extension won't work with e.g. chan_capi.

Cheers, Philipp

------- Forwarded message follows -------
Date sent:      	Thu, 08 Jul 2004 16:08:25 -0400 (EDT)
From:           	James Golovich <james@wwnet.net>
Subject:        	Re: [Asterisk-Users] Fax Detection
To:             	asterisk-users@lists.digium.com
Send reply to:  	asterisk-users@lists.digium.com

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On Thu, 8 Jul 2004, Ryan Courtnage wrote:

> AFAIK it's the digium card that _detects_ the fax, and allows the call 
> to jump to the 'fax' extension.  So fax _detection_ is a function of 
> the card/driver .. and using the 'fax' extension requires the use of a 
> digium card.
> 
> SpanDSP just talks fax .. I don't think it actually does any detection.

It's not the card that detects the fax.  Its the builtin code in asterisk
that does it (dsp.c).  chan_zap.c is currently the only channel driver
that uses the faxdetection but in theory it could be enabled/used in other
channel drivers as well

James

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