[Asterisk-Users] Fax detection in voip channel

[Brian West]

Na we did faxing over:

SIP => ASTERISK => IAX => PSTN => ASTERISK => IAX => ASTERISK => PRI =>
HYLAFAX

Worked great.. and it started on someone's cable modem.. using g726 no less.

bkw

> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
> bounces at lists.digium.com] On Behalf Of Lee Howard
> Sent: Thursday, October 21, 2004 5:20 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Cc: usedcanon
> Subject: Re: [Asterisk-Users] Fax detection in voip channel
> 
> On 2004.10.21 14:49 usedcanon wrote:
> > Hi All,
> >
> > Is it possible to detect an incomming fax just as it is possible with
> > Answer
> > on a Zap channel. If not do others find the possibility of this
> > enhancement
> > useful too?
> 
> Doing fax over SIP or IAX would be a frustrating effort, and a complete
> waste of time, IMO.  See:
> 
>      http://www.opencall.org/faq/x47.html
> 
> If you don't believe me, go ahead and actually *try* to send/receive a
> fax through a WAN/internet VoIP connection.  You'll probably get
> tolerable results with SIP-fax on a LAN, but run it through a VoIP
> provider over the internet, and you'll have a mess, even if the codec
> is ULAW/ALAW
> 
> What you really want is a T.38 channel driver.
> 
> Lee.
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