On 2 October 2011 21:36, Sebastian Arcus <[email protected]> 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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