The best way to understand all NAT variations -> 
http://en.wikipedia.org/wiki/Network_address_translation In there they explain: 
Symmetric NATEach request from the same internal IP address and port to a 
specific destination IP address and port is mapped to a unique external source 
IP address and port, if the same internal host sends a packet even with the 
same source address and port but to a different destination, a different 
mapping is used.Only an external host that receives a packet from an internal 
host can send a packet back.
 Date: Sun, 3 Mar 2013 23:05:46 +0700
From: onmyway...@gmail.com
To: sr-users@lists.sip-router.org
Subject: Re: [SR-Users] Kamailio problem with both clients in the same NAT

Is that symmetric NAT ?

On Thu, Feb 28, 2013 at 6:46 PM, mohavere36 <mohaver...@yahoo.com> wrote:


  

    
    
  
  
     hi, I'm struggling for 2 days to make a config file for kamailio in
    a situation where clients arein the same nat but kamailio has public
    IP, one way audio problem, does any one have a solution for it?

    

  



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