Hi Ronald,

about all this NAT tools is a whole philosophy which cannot be explained via email. I will just give you some hints and you will need to dig on the internet for more.

STUN - the traversal is done by the client - the STUN server is in the public network and the client will use it to discover its public address and port. This may not be possible all the time, depending of the type of NAT. So, the client will be visible as public by the SIP server.

nathelper + rtpproxy / 2xmediaproxy - the traversal is done by the SIP server - the client sends private IPs both in signalling and SDP part - the openser module will take care of the signalling part (to replace private IPs with public ones) and it will also use a media relay (rtpproxy / mediaproxy) to help the RTP stream to cross the NAT

About the usage - configure the client to use STUN -if works ok; if not it will fallback to the second scenario where the proxy will do the traversal.

again, this is a vast topic, so please google on it.

regards bogdan

Ronald Wiplinger wrote:

We have STUN, nathelper with rtpproxy or mediaproxy, ... maybe even more.

Which one is good for which situation? What are the differences? How can I cover each situation? Can I combine different methods?

bye

Ronald

---

Users mailing list Users@openser.org http://openser.org/cgi-bin/mailman/listinfo/users