[Asterisk-Users] Multiple IAX Phones Behind NAT

[Steve Kann]

Harold Fletcher wrote:

>Steve:
>
>But how will that work for incoming calls?  Assume that three phones
>have registered with an Asterisk box from inside a NAT, then * knows
>that these three users can be found at x.x.x.x port 4569.
>
Nope.

Asterisk would then know that these three users have registered from 
NAT-ADDRESS:natted-port, where natted-port will be different for each user.


>  When *
>receives an incoming call intended for one of those users, all it can do
>is forward those calls to x.x.x.x:4569, right?
>

No, asterisk will send it to the same port the registration came from, 
which should be different for each user.

>  In that case I don't
>understand how the NAT can know to which user the incoming call is
>referring.
>  
>
Because when it sends out the registrations, each inside machine will 
get a different external port assigned.


>Will Fletcher
>
>
>
>Auburn University
>Department of Computer Science
>107 Dunstan Hall
>Auburn, AL 36849
>334-332-9544
>fletchw at auburn.edu
>  
>
>>>>stevek at stevek.com 03/11/05 11:22 AM >>>
>>>>        
>>>>
>Will Fletcher wrote:
>
>  
>
>>Hi folks,
>>
>>Ok, I've seen this question go unanswered on the mailing list, and I 
>>assume it's because no one had the heart to break the bad news to the 
>>guy asking, but be honest with me, I can take it.  At this time it's 
>>flat impossible to have multiple IAX phones behind a NAT without using
>>    
>>
>
>  
>
>>an * gateway because there's no way to have a client listen on a port 
>>besides 4569.  Is my only option to learn about SIP and attempt to 
>>forward that through my NAT?
>>    
>>
>
>
>Not true;
>
>You just need the iax phones to register, and then they will work fine 
>through the NAT; whatever port they're on on local machines, and 
>whatever port they get NATted to won't matter.
>
>-SteveK
>
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