Hi Robert
Am I right to assume that media will flow directly between end points if
the end points are within one VPN even if they are dispersed.
VPN seems to me to be the only NAT traversal that allows media to flow
directly between UA in all scenarios.
Please confirm.
Charles
-----Original Message-----
From: Robert Joly [mailto:[EMAIL PROTECTED]
Sent: Monday, September 08, 2008 8:31 AM
To: [EMAIL PROTECTED]; [email protected]
Subject: RE: [sipx-users] SIPX 4.0 NAT traversal
> please hep me understand how far end NAT traversal solution
> planned for V4.0 will work.
>
> I would like to understand if media packets will pass through
> SIPX in the scenario where communicating UA are both remotely
> registered.
Similar to what the InGate does, media sessions between endpoints that
are separated by NATs will see their media 'commute' through sipXecs.
That media 'anchoring' at the sipXecs in the only reliable way of
overcoming all types of NATs.
>
> In the scenario I am thinking of, SIPX 4.0 (when it is ready
> and stable!) is deployed in a data centre to serve a multi
> site organization with remote (work from home) and mobile
> (road warrior) workers. Lets say 2 employees' UA (one at home
> and another in a hotel) are both registered on SIPX 4.0 and
> using the remote far end NAT traversal solution planned and
> have an established call. Will the media in such a call flow
> directly between the UA as in conventional SIP calls.
The media will be from UA1<--->media relay running on sipXecs<--->UA2.
If both UAs are in the same remote location then the choice of
'anchoring' the media at the sipXecs is configurable. If the NAT
Traversal feature is set in 'aggressive' mode then a media relay will be
used to anchor the media. If the mode is set to 'conservative' then the
UAs will be instructed to stream to each other directly.
>
> I am trying to get a feel for traffic handling if the future
> version of SIPX is deployed in a scenario similar to the one
> that I describe; a virtual work place where everyone works remotely.
The rule of thumb is that if there is one or more NATs between the
caller and the callee then the sipXecs will anchor the media. Again,
that anchoring technique is the only way to overcome all the types of
NATs out there.
>
> Charles Mutunga
>
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