[Serusers] Totally lost! proxies, firewalls, gateways, etc, etc, etc ...

Pablo Murillo pm at rednet.com.ar
Fri Dec 12 16:06:03 CET 2003


Thanks Klaus, but ...

If, I use RTP proxy all the traffic would go through my server or am I
mistaken?

----- Original Message ----- 
If you want 2 NATed devices to talk to each other, you MUST use an RTP proxy
(except you want to manually configure the NAT router of every participant).

Sessions between one public and one NATed client might work depending on the
used SIP applications. Therefore, using an RTP proxy as soon at least one
client is behind NAT is suggested!

It's very simple, take a look at the config script at:
http://cvs.berlios.de/cgi-bin/viewcvs.cgi/ser/sip_router/etc/nathelper.cfg?rev=1.1&content-type=text/vnd.viewcvs-markup

This will show you how to test if user agents are behind a NAT, how to
rewrite the SIP messages and how to integrate the RTP proxy.

Note: NAT traversal using RTP proxies and the nathelper module works only if
the SIP client is symmetric (=sending and receiving on the same port, SIP
and RTP).
--------------------------------

Pablo Murillo




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