[asterisk-users] Sipgate trunk doesn't bridge with other trunk, but works with local extensions

[dotnetdub]

On 2 October 2011 21:36, Sebastian Arcus <shop at open-t.co.uk> wrote:

> Just a follow up. I've opened up udp ports 10000-20000 on the Linux box
> (where Asterisk is) and now I have sound. However, bear in mind that the
> Netgear router/modem which is connected to the Internet (the Linux/Asterisk
> box is behind it, in a private lan) does *not* have any forwarded ports
> whatsoever, or DMZ setup. So it is a mystery to me how the Linux box needs
> ports open, while the Netgear router doesn't.
>

If you look at /etc/asterisk/rtp.conf that bit should make sense.

Your netgear probably has a SIP ALG and is looking at the SDP in the SIP
messages and dynamically opening / forwarding ports.
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