VoIP Mailing List Archives

[bilmar_gh at yahoo.com]

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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[thp at westhawk.co.uk]

If you are careful, you only need to setup a port forward at one end
of the IAX trunk.

Have one Asterisk register (regularly) with the other.
The second asterisk (server) will need to have port 4569 forwarded
through it's router.
The first asterisk (client) wont need any port forwarding.

Tim.
On 2 Jan 2008, at 10:18, Rob Hillis wrote:

[bilmar_gh at yahoo.com]

Hi Rob;

Big thanks for your kindly help and answer, so
rtp.conf file is used by sip and h323 only, correct?
In that case if I am going to use the sip trunk then I
need to route the UDP ports used by the rtp.conf file
and that existed in sip.conf, but really i do not know
if any use TCP. Correct?

But I would like to ask how all the calls of the trunk
(sometimes it could be 30 calls for example) will
handled by one port only (in iax protocol)? Does not
mean that in huge calls, sip might work better?

Your kindly help is high appreciated.
Regards
Bilal

-----------------------
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:

[thp at westhawk.co.uk]

30 calls in a trunk will be fine for IAX.

In fact IAX has a 'trunked' mode that could enable
that allows you to save
quite a lot of bandwidth by shrinking the packet headers
between a pair of asterisk systems.
Tim.

On 2 Jan 2008, at 15:26, bilal ghayyad wrote:

[thp at westhawk.co.uk]

Sure, but if (as is often the case) you only have control over the
firewall at one end of the
link, you set the forwarding at the end you control and have the far
end to register to you every
30 seconds.

Tim.
On 2 Jan 2008, at 15:13, Rob Hillis wrote:

[andres at paglayan.com]

On Jan 2, 2008, at 12:33 AM, bilal ghayyad wrote: