[Asterisk-Users] ATA not sending data to asterisk?

[Ronald Wiplinger]

Matt wrote:

>Hi,
>I've just setup a second asterisk system and am having a wierd
>problem.   If I am on the same network as the system it works fine...
>if I am outside coming in from the internet through a NAT I get the
>following:
>
>I can place calls.... I can hear the asterisk system.  The asterisk
>system does not seem to hear me.  When I do a tcpdump I don't even see
>the ATA sending anything to the asterisk box (when I tcpdump on the
>network side of the ATA).   I've tried 2 ATAs, and X-Lite on a mac and
>windows 2000.. all exibit the same issue on this setup.   Any ideas?
>
>What would cause the ATA and Softphone to not send data (UDP streams)
>to the asterisk box?
>  
>
Have you checked the firewall? UDP ports open according to your 
settings? (on both sites)

bye

Ronald