[Asterisk-Users] T.38 fax with SIP devices

[Steve Underwood]

Asterisk needs more than to just allow T.38 as a codec type. T.38 only 
recently gained an RTP option, and very few things support it so far. 
You need to have a UDPTL transport for most boxes supporting T.38. I 
have a working UDPTL for *, but it needs more polishing before release.

Regards,
Steve


Mark Dutton wrote:

>Right you are Michael.
>
>I have some Multitech MVP200s and they do work indeed. Only problem is mine
>are too old to do SIP. I know Asterisk does not do T.39 but as it only needs
>to ALLOW the codec when devices are communicating with each other, it can't
>be too hard to get working. Perhaps the t39fax codec needs to be added to
>the Asterisk codec list so it knows about it and then it can be added to the
>allow list in SIP.
>
>Mark
>
>Date: Thu, 07 Apr 2005 21:17:03 -0700
>From: Michael D Schelin <mike at shelcomm.com>
>Subject: Re: [Asterisk-Users] T.38 fax with SIP devices
>To: Scott Wolfe <scottwolfe at orbus.net>,	Asterisk Users Mailing List -
>	Non-Commercial Discussion	<asterisk-users at lists.digium.com>
>Message-ID: <425605BF.1080908 at shelcomm.com>
>Content-Type: text/plain; charset="us-ascii"
>
>Hello, The Multitech VOIP line supports T38 and I have tested it. It works
>great.  You will need a public IP to make it work. Very expensive though.
>T38 Is not compatible with Asterisk.
>  
>