Table of Contents
Making SIP NAT Friendly
Problem Statement
NAT Friendly Guidelines
Basic concepts
Our assumptions
Reference Model
First problem: SIP UAC to proxy
Second problem: proxy to UAS
Contact Cookie
Solves many other problems
Hard part: RTP
Symmetric RTP
Handles two of three cases
What about third case?
How does translator get there?
How does translator get there?
Symmetric RTP Solves other problems too
So, what needs to be done?
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