[Asterisk-Users] Fax detection in voip channel

[Matt Hess]

Ironically, I just got back to my desk from faxing an 18 page document.. 
ulaw codec..
call path: sip gateway - asterisk - max tnt - pri lines/pstn
I haven't really had many troubles with fax.. apart from when I was 
using a particular voip provider named voiplist.. they refused to 
support it saying that and I quote: "the service is voice over ip not 
fax over ip"

how silly is that..

But I do agree.. a nice open t.38 platform would be wonderful.. inside 
of asterisk.. on media gateways.. everywhere.. but it isn't there yet..


usedcanon wrote:

>-----Original Message-----
>From: Lee Howard [mailto:faxguy at howardsilvan.com]
>Sent: 21 October 2004 23:20
>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.
>
>I understand what you are saying however there are scenarios where fax over
>voip works fine, I have tested (briefly) with spandsp and have done so
>sucessfully.
>
>as a sperate solutions we use mediatrix gateways very successfully for fax
>transmision over IP, our IP network is private and does not touch the
>internet so we can gaurantee (to some extent) bandwidth and quality.
>
>A T.38 solution would be most desirable, no doubt, but is there one ? I
>don't even see a mention of it anywhere.
>
>Umar
>
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