Have you tried limiting your fax machines to a lower baud rate like 9600.
I know on Vonage this seems to help.

----- Original Message ----- 
From: "Eduardo Goncalves" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, June 26, 2003 10:10 AM
Subject: Re: [Asterisk-Users] Fax and SIP


> On Thu, 26 Jun 2003 09:01:21 +0200
> Florian Overkamp <[EMAIL PROTECTED]> wrote:
> 
> > Hi there,
> > 
> > I have made this setup work without any special modifications. I expect it 
> > raises some strict requirements on the latency of your IP network, so that 
> > might be an issue.
> > 
> > |cisco-ata186|----sip-----|asterisk|-------E400P PRI -----PSTN
> > 
> > The IP network was full blast 100Mbit/s with one router inbetween.
> > 
> 
> I've tested with both on the localnet (same ethernet hub) and I still get errors on 
> the fax machine.
> 
> Eduardo
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