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 From:  "Michael Graves" <mgraves at mstvp dot com>
 To:  "Dave Warren" <maillist at devilsplayground dot net>, "per at tocodata dot no" <per at tocodata dot no>
 Cc:  "m0n0wall at lists dot m0n0 dot ch" <m0n0wall at lists dot m0n0 dot ch>
 Subject:  Re: [m0n0wall] Fax with VoIP
 Date:  Sun, 28 Aug 2005 18:42:44 -0500
In many cases fax over VOIP simply isn't possible. I use m0n0wall and
also a Asterisk server to provide voip based phones for y home and
office. Fax over voip is only really reliable with T.38 protocol
implemented. Most ATAs don't implement this, or provide poor
implementations. You certainly won't have any success using a highly
compressed codec. Only using G.711 will you even have a chance.

If your m0n0wall installation is successfully working with the voip
installation from a voice perspective then m0n0 is working correctly.
What you're seeing is probably not a m0n0wall issue at all.

Fax is in part the achilles heel of voip.


On Sun, 28 Aug 2005 13:31:09 -0600, Dave Warren wrote:

>Per Willy Buffelen wrote:
>>Sending fax over VoIP with m0n0wall problem, every time i try to use a fax
>>conencted to a VoIP box i get TX error on the faxmachine, i have tried this
>>on 2 different computers with m0n0wall, with Linksys and IPCop its okey, can
>>it have something to do with PPPoE and MTU=1412, if i use the standard value
>>on MTU there is many strange thing happens.
>I'm not sure if this helps at all, but I fax across my Vonage VoIP line 
>through m0n0wall in NAT mode on a fairly regular basis.  I set the fax 
>to cap at 9600bps, but aside from that, no issues.
>14400bps usually works as long as ECM is enabled, but without ECM 
>14400bps isn't always reliable.
>There are two times when a man doesn't understand a woman
>before marriage and after marriage. 
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Michael Graves                           mgraves at pixelpower dot com
Sr. Product Specialist                          www.pixelpower.com
Pixel Power Inc.                                 mgraves at mstvp dot com

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