On 02/10/11 21:58, dotnetdub wrote:


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

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

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