[Freeswitch-users] Full NAT bypass solution with STUN/ICE/FS but without TURN: is possible?

[David Ponzone]

Fabio,

this sounds like a question to ask to your SIP phones vendor.

David Ponzone  Direction Technique
email: david.ponzone at ipeva.fr
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Le 08/06/2010 à 10:37, Fabio Pietrosanti (naif) a écrit :

> Hi all,
>
> i need to setup a server that handle VoIP connection in a way that
> always works in the most efficient way respect to latency and NAT  
> traversal.
>
> FS provide very good NAT detection system but unfortunately when it
> fail, it just fail and does not have any kind of fallback mechanism.
> If FS do bypass-media and the client cannot communicate because the
> phone call is lost.
> If FS do proxy-media, the clients can always communicate (over UDP)  
> but
> there is added latency.
>
> So we cannot rely only on FS NAT detection system and need also some
> client side system.
>
> Now, in theory the best approach would be not to touch FS but just use
> client-side system based on ICE/STUN with a TURN server-side component
> as a fallback.
>
> However there's no widely available TURN server, or at least TURN is  
> not
> widely and well diffused just now.
>
> I am wondering whether it may be possible to make a setup where:
> - Client try to establish peer to peer connectivity with STUN/ICE  
> (so FS
> is doing bypass-media not touching the SDP)
> - If they cannot work, will go in fallback to FS (but with proxy- 
> media)
> instead than going via TURN
>
> So using the FS B2BUA proxy-media feature as alternative to TURN  
> server,
> but letting clients to dynamically try to connect directly one each
> other by using the ICE methods that are dynamic.
>
> Does it seems  something feasible?
>
> Fabio Pietrosanti
>
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