[Users] NAT: STUN, nathelper, rtpproxy, mediaproxy

[Bogdan-Andrei Iancu]

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
>
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