[Serusers] Theory behind a media proxy and NATed UA

[Greger V. Teigre]

Section 3.5 of the ONsip.org Getting Started document provides an intro from 
a SIP/SER point of view.  Tell me if you miss something :-)
g-)

----- Original Message ----- 
From: "Felipe Louback" <louback at gmail.com>
To: <serusers at lists.iptel.org>
Sent: Monday, October 03, 2005 07:27 PM
Subject: [Serusers] Theory behind a media proxy and NATed UA


> The problem with NAT is because the IP address of the SDP body is a
> non routeable IP. So how does a media proxy works?
>
> I read that a media proxy put his address at the sdp body and both UA
> talks with the media proxy instead of each other. At the time a NAT
> user sends an INVITE, there is no corresponding port on the NAT. So
> How does a media proxy contact the NATed UA?
> Isn't this the same problem the called part will have to contact the
> NATed party?
>
> I read a couple of papers about it, but in all of them it is said that
> both ends talk to the media proxy and that is all. No explanation
> about how things work. I know it works because I am using mediaproxy.
>
> If anyone could point me how this works or where I can find a document
> explaining....
>
> Thanks,
>
> Felipe
>
> --
> Master Student - Electrical Engineering Department
> Computer Engineering and Telecommunications Research Group
> Universidade Federal de Minas Gerais - Brazil
>
> "For God so loved the world that he gave his one and only Son, that
> whoever believes in him shall not perish but have eternal life."
> John 3:16
>
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