Subject: RE: Behind the NAT registration

From: "Dan Wing" <[email-masked]>
Date: Tue, 4 Sep 2007 19:35:14 -0700

This question is more appropriate for the SIP or SIPPING mailing lists.

However, to answer your question:  see draft-ietf-sip-outbound-10.txt.

-d

> -----Original Message-----
> From: Dangi [mailto:[email-masked]] 
> Sent: Friday, August 31, 2007 5:47 AM
> To: [email-masked]
> Subject: Behind the NAT registration
> 
> Hi All,
>    Assume a scenario where SIP UA is running behind a NAT. At 
> the time of registration, what should be the address put in 
> "Contact" header i.e. local/public IP?
>  If UA populates its local IP in "Contact" header, then that 
> can't be used to terminate call.
> In general, its UA who determine its NAT bindings and 
> poupulate in "Contact" header or registrar determine it from 
> source of IP packet and send back in "Contact" header in 200 OK?
>  
> What is the best way to enable call termination on this UA 
> behind NAT i.e rport,stun,etc? 
>  
> Thanks a lot,
> /raj
> 

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