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

[Sebastian Arcus]

On 02/10/11 21:58, dotnetdub wrote:
>
>
> On 2 October 2011 21:36, Sebastian Arcus <shop at open-t.co.uk
> <mailto: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.

Considering that in this case my Asterisk is acting as a SIP 
client/agent connected to sipgate.co.uk - is the sipgate.co.uk end the 
one which is deciding which rtp ports to use - or my end? Will it make 
any difference if a change my rtp.conf?

Sebastian