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

[Rob Hillis]

Perhaps.  I've never been one to trust that firewalls operate as they
should - I've been bitten far too many times by a firewall that doesn't
quite behave as you expect.  Also, when diagnosing network connectivity
problems, I find that it helps to have the rules in place rather than
having to infer the rule.

Tim Panton wrote:
> 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:
>
>   
>> 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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>
>
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