[SIPForum-discussion] RTP is possible when caller and callee are located behind the Symmetric NAT

[Neill Wilkinson]

Just a thought on Clarification of the question/answer.

 

If both devices are behind the same Symmetric NAT firewall, then "Media
Release" would work as the devices are essentially on the "same network".

 

If however you have devices behind different Symmetric NAT firewalls, the
only mechanism for RTP to flow between them is via a "media relay" point -
e.g. a Session Border Controller.

 

                                                [RTP Relay]

                                                  /              \

                                                /                  \

                                              /                      \

       [sym-NAT]       [sym-NAT]

 

Neill...;o)

 



Neill Wilkinson
Principal Consultant
  

Aeonvista Ltd - opening up new ideas

 


 

 

 

 

 

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Vivek Batra
Sent: 23 August 2008 15:14
To: avorlando at yahoo.com
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] RTP is possible when caller and callee
are located behind the Symmetric NAT

 

Anthony,
Would SBC relay the RTP?

I don't want to use any SIP device other then the SIP clients used by caller
and callee to have RTP between them.

Will forwarding SIP and RTP ports (UDP) in NAT router to SIP clients will
work in those cases?

--Vivek Batra

On Fri, Aug 22, 2008 at 11:53 AM, Anthony Orlando <avorlando at yahoo.com>
wrote:


Absolutely.  It's called media release.  SBC's like Acme support it.

Anthony

--- On Fri, 8/22/08, Vivek Batra <vivek7683 at gmail.com> wrote:

From: Vivek Batra <vivek7683 at gmail.com>
Subject: [SIPForum-discussion] RTP is possible when caller and callee are
located behind the Symmetric NAT
To: discussion at sipforum.org
Date: Friday, August 22, 2008, 11:52 AM

 

Hi Folks,
Is it possible to have RTP directly (No RTP Relay) between two SIP clients
when they both are located behind Symmetric NAT?

--Vivek Batra 

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