[Asterisk-Users] Q about IAX (and IAXy)

[Christopher Dobbs]

As Per The WiKi:

IAX sends both command information and voice data over the same connection.
This allows it th transverse a NAT seamlessly.

As for Double NAT, My setup is:
Home PBX <----[Wireless]----> ISP WiFi NAT <----[Ethernet]----> Primary 
NAT <----[Ethernet]----> Work PBX

So, Yes it will work over double NAT, I can send and receive calls at home.
In fact, I call my wife all the time from work.

--
Christopher Dobbs

Nabeel Jafferali wrote:

>This is somewhat related to my other query on the list regarding NAT
>traversal.
>
>I have heard many times that IAX is "NAT-transperant". I am unsure how
>it accomplishes this.
>
>I do know that SIP works like this: your SIP device send a request to
>the SIP server (usually on port 5060) with whatever command. The SIP
>server respends to your device's "apparent" IP and port (this is decided
>depending on how that NAT is set up, STUN, etc.). The voice is then sent
>to the "apparent" RTP port on your device (deciding what that is, again,
>would depend on the NAT set up).
>
>How does IAX eliminate this problem of ports being "mapped" by your NAT
>router and external IPs? Does it use one port for both commands and
>voice packets? Does the remote server just use the "received from" IP
>address and port to respond?
>
>Finally, would an IAXy work seamlessly in a configuration where it is
>plugged into a NAT router which is plugged into another NAT router  -
>double NATted? The * server is on a public IP.
>
>--
>Nabeel Jafferali
>tel: 647.722.8457 x201
>     718.606.4190 x201
>fwd: 46990 x201
>email/msn: nabeel<at>jafferali.net
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