[SIPForum-discussion] NAT

Joaquim Rodrigues joaquim.jl.rodrigues at gmail.com
Tue Sep 27 09:39:44 UTC 2011


You have several mechanisms to address that network topology, each with its
own strengths and flaws:


STUN - Works fine between two SIP EP with some NATs, but fails in others
(symmetric NAT)

TURN - Extends STUN to bypass limitations, but requires a media relay on all

ICE - A more intelligent approach, derived from STUN/TURN, which allows
end-points to select be best path to establish the media stream

ALG - Implemented on the network border, also known as NAT Traversal


The first three need to be supported by end-points, while ALG is implemented
on the network border equipment.




From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Enthiran k
Sent: segunda-feira, 26 de Setembro de 2011 19:08
To: discussion at sipforum.org
Subject: [SIPForum-discussion] NAT


Hi All, 


when my SIP client is hiding behind the SIP unaware NAT then my SIP call
wont be successful ?? is my understaning is correct ?? 


Always the NAT needs to be SIP aware ( like ALG ) to support the SIP calls


Guys some one plss confirm and it would be much appriciated if u can explain
me more on this ? 




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