[asterisk-dev] T.38 Issues

[Klaus Darilion]

Just a guess: If the ATA is behind NAT and for some reason stoped 
announcing the public IP but now announces the private IP in the SDP, 
then you might have NAT problems.

Check if you have a "t38pt_usertpsource=yes" (which btw. is IMO a bad 
name as it should not use the rtp source, but just should send back 
symmetric from where the packets were received, and it should be 
automatically if nat=yes for that peer)

regards
klaus

Am 01.04.2010 22:08, schrieb Bryant Zimmerman:
>
> Our T.38 stopped working on Monday.
>
> Our system is setup with a PRI gatway to an asterisk 1.6.1.18 server to
> the ATA
>
> We are using NAT between the Asterisk switch and the ATA units
>
> When I do packet captures at the server I see both legs of the call
> (Server to Gateway) and (Server to ATA)
> The inital T.38 signialling seems to be working but the T.38 UDP from the
> gateway to the server is not being sent from the server to ATA.
>
> This was working on Sunday as 10 faxes went out with no issue.
> Nothing was changed on the asterisk server and I have restart the
> asterisk process
>
> Any ideas why asterisk would not be forwarding the T.38 UDP packets to
> the end point.
> At first I thought it might be a Nat issue but they are not even being
> sent from the server?
>
> Any advice on how to further trouble shoot this one?
>
> Thanks
> Bryant
>