[asterisk-users] Two Asterisks behind NAT and need to link them using IAX trunk

[Rob Hillis]

The reason that IAX2 is considered good for NAT issues is that it uses
only one port for both control messages and voice traffic as opposed to
SIP that uses a predictable port for control messages and an
unpredictable one for voice/video traffic.

If both servers are behind NAT servers, you /will/ need to ensure that
the appropriate UDP port (by default 4569) are forwarded to your
Asterisk servers.  Only this port is required - RTP isn't used by IAX2.

bilal ghayyad wrote:
> Hi List;
>
> I heared that IAX is good for NATing issues, but I do
> not know if it can help me in that senario:
>
> I have two Asterisks machines in different sites and
> both are behind NAT (both have private IP address), I
> need to link these two asterisks with IAX trunk (if it
> help really in such senario), but I do not know if it
> will work without doing special routing settings on
> the router (like TCP/UDP port mapping or IP
> forwarding)? How that will be it if possible? Or I
> have to do a kind of port mapping?
>
> If I will need to use port mapping, then I have to map
> the TCP and UDP ports that are determined in iax.conf
> and rtp.conf files at site A for asterisk ip address
> at site A? Or I have to map the TCP and UDP ports that
> are in iax.conf and rtp.conf at site B for asterisk ip
> address at site A? In other words, if I am at site B
> then I have to go for router B and do mapping for
> TCP/UDP ports of the asterisk at site B or the
> asterisk at site A?
>
> Any help.
> Regards
> Bilal
>
>
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