[asterisk-users] UDPTL T38 via NAT

[Johann Steinwendtner]

On 2010-06-22 12:36, Remco Bressers wrote:
> Dear list,
>
> I've got the following setup :
>
> [FAX-ATA]--[PBX LAN]--[Firewall]--[PBX WAN]-----[upstream SIP]
>
> On the PBX's we run Asterisk 1.4.33 with t38pt_udptl=yes in [general].
> The FAX ATA is a Teles VoIPBox with T.38 support (that works). On the
> PBX WAN, i see the following in udptl debug :
>
> Sent UDPTL packet to 172.16.0.156:4460 (type 0, seq 184, len 32)
> Got UDPTL packet from 62.180.xx.xx:36170 (type 0, seq 0, len 32)
> Sent UDPTL packet to 172.16.0.156:4460 (type 0, seq 185, len 32)
> Got UDPTL packet from 62.180.xx.xx:36170 (type 0, seq 0, len 32)
> Sent UDPTL packet to 172.16.0.156:4460 (type 0, seq 186, len 32)
> Got UDPTL packet from 62.180.xx.xx:36170 (type 0, seq 0, len 29)
>
> This means my outgoing udptl traffic is correctly translated, but
> somehow i'm sending 172.16.0.156 instead of my public IP address on the
> firewall.
>


Did you try t38pt_usertpsource=yes ?

Best regards

Hans