Ive found trying to make this work is easier (esp in a LAN environment if you 
disable fax relay in the dial-peer and set it for passthrough). This solved the 
intermittent problems I had as well as the unknown rtp issues. 

I can post an example when not on my mobile. 

Jared Mauch

On Apr 16, 2011, at 2:26 AM, Larry Moore <lmo...@starwon.com.au> wrote:

> On 16/04/2011 1:24 PM, Oguzhan Kayhan wrote:
>> Hello,
>> We have a sip trunk end point with cisco media gateway.
>> VoIP works fine.
>> But when we try to send faxes thru this trunk, we simply can not.
>> 
>> Is there anybody experienced such problem and solved?
>> How should i set sip.conf and udptl.conf.
>> 
>> I already have t38pt_udptl=yes in sip.conf
> 
> Which version of Asterisk are you using, where in your sip.conf do you have 
> t38pt_udptl= and where are the facsimile transmissions originating from and 
> destined to?
> 
> Larry.
> 
> 
> 
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