[asterisk-users] asterisk 1.4.X, T.38 and NAT

[Michael]

On Fri, 29 May 2009 01:52:08 Antoine Megalla wrote:
> Hi,
>
> I have been trying to get T.38 to work with clients behind NAT for the past
> week but with no success.
>
> I have an asterisk server on the public internet and several Grandstream (I
> tried Linksys too) HT502 ATAs behind NAT in different locations. I tried
> every possible combination of NAT, canreinvite, t38pt_usertpsource entries,
> I even tried asterisk 1.4.19, 1.4.24.1, 1.4.25 all with the same result;
> Failure.
>
> I can see the t38 negotiations, and I think the problem is in the reinvite
> message after T.38 detection.

T38 is ****

If I see another post about problems with T38 I might want to scream... lol.

Yesterday I had a standard POTs line installed and I transfered my fax number 
back to a PSTN provider (from a T38 provider).

I had a uncontended, stable, very low latency fibre link to the upline ISP, 
direct unNAT'd IP connection, then a short hop skip and jump to the T38 
provider, and I still could not get it to work reliably.

Much less for those on commodity grade cable/xDSL connections with NAT.