[asterisk-users] Re: OK to have Asterisk and clients behind firewalls?

[Vincent]

On Tue, 22 May 2007 11:45:34 +0200, randulo <spamsucks2005 at gmail.com>
wrote:
>Upon replacement of the Linksys, everything worked fine except audio
>on the Sipura. Turns out you need Symmetric RTP turned on in the phone
>as Chris Mason says below.

Thanks for the tip. The IP phone doesn't have a setting that says
"Symetric RTP", and turning it off in the 3102 doesn't make a
difference.

Here's the updated diagram:

http://codecomplete.free.fr/3102_nat/voip_no_sound_open_ports.jpg

I set up a syslog-ng server on the Asterisk host. I'm (obviously) no
SIP expert, but, although the remote IP phone's public IP comes up
twice towards the end, it looks like the Linksys sends RTP packets
Asterisk instead:

http://codecomplete.free.fr/3102_nat/calling_into_linksys.txt

Must be one of those problems that are solved in 2 seconds with the
right click or line in a configuration file... when you know what
you're doing :-)

Thank you.