RE: [P2PSIP] Choice of STUN peer or TURN peer

>
>
>   TURN client         STUN server          NAT  TURN server
>        |                   |                |      |
>  1.    |------give me a TURN address------->|----->|
>  2.    |                   |<--STUN Request--------|
>  3.    |                   |-STUN Response->|----->|
>  4.    |<-----here is your TURN address------------|
>
>
> Messages 2-3 are normal STUN request/response messages, and
> tell the TURN server a publicly-routable IP address and UDP
> port.  The IP address and UDP port returned in in the STUN
> Response (message 3) is the TURN server's publicly-routable
> transport address, and is given to the TURN client in message
> 4.
>
>

Does the "p2p-friendly" mean the NAT allows the STUN messages pass through?
How does the message 1 (STUN) go through the NAT?

I guess the TURN server has to send STUN keep alive messages to keep the NAT
hole open before the TURN request expire?

thanks,
Jerry

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