asterisk users - Apr 2011 - any experience with cisco media gw with fax???

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

Thank you.

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.

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 <lmoore at 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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On 04/16/2011 01:24 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
>
> Thank you.
How old is the Cisco software? It appears they completely changed their 
T.38 software platform a couple of years ago. Before that is was awful. 
I wasted a lot of time, while developing my T.38 platform, hunting down 
problems that turned out to be broken Ciscos. Since the new software has 
spread into the field, the complaints have largely gone away.

Steve