[asterisk-users] NAT yes

[Flavio Miranda]

Thanks  Alex Balashov,

   I am experiencing some one-way audio, that's the reason of the questions! 

Att,

 

Flavio Roberto Miranda

MSN:flaviormiranda at hotmail.com
Skype: flaviormiranda

> Date: Tue, 26 Jul 2011 09:23:42 -0400
> From: abalashov at evaristesys.com
> To: asterisk-users at lists.digium.com
> Subject: Re: [asterisk-users] NAT yes
> 
> On 07/26/2011 09:19 AM, Flavio Miranda wrote:
> 
> > In a no natted environment if I letnat=yes on sip.conf it would
> > cause some thing bad or it is irrelevant ? Anybody know ?
> 
> There is no harm unless the endpoint you are dealing with does not do 
> symmetric RTP.  The nat=yes option assumes that it is okay to send RTP 
> back to the source port from which it originated, irrespectively of 
> what's in the SDP.  This will cause one-way audio if the endpoint 
> happens to want to receive RTP on a different port than the one it is 
> sending it from.
> 
> Almost all endpoints these days do symmetric RTP, though, so it's not 
> a huge concern.
> 
> That said, from a methodological and aesthetic perspective, it is 
> better not to break standard RFC-compliant behaviour unnecessarily. 
> Thus, I would not enable nat=yes unless there really is no direct 
> network and transport-layer reachability to the endpoint.
> 
> -- 
> Alex Balashov - Principal
> Evariste Systems LLC
> 260 Peachtree Street NW
> Suite 2200
> Atlanta, GA 30303
> Tel: +1-678-954-0670
> Fax: +1-404-961-1892
> Web: http://www.evaristesys.com/
> 
> --
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