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:[EMAIL PROTECTED] 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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