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

[Tim Panton]

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:

> 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:
>> 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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