[Serusers] NAT NAT..and a little more NAT

[Greger V. Teigre]

That's correct. The UA will use STUN at boot to detect NAT behavior/type. 
Based on this knowledge it will calculaee it's public IP and port number and 
use this information in all SIP messages to the registrar/proxy.
g-)

hwang at gaia.ecs.csus.edu wrote:
> I'm a little confused.
> Correct me if I'm wrong.  If STUN is used, the UA find out what kind
> of NAT it's behind by talking to the STUN server.  Then the UA modify
> the address/port send to proxy server depend on the STUN query result.
> The proxy server doesn't need to know the existance of the STUN
> server. The STUN server's only purpose is for the UA to figure out
> it's "location." So, the term "go through STUN" is confusing me.  The
> SIP packets doens't go "through" STUN, then to proxy.  It should go
> directly to the proxy. Please clear me out, thanks.
>
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