[Asterisk-Users] Multiple IAX Phones Behind NAT

[Will Fletcher]

Well you had that absolutely right, I can' believe I got as mixed up as 
I did.  NAT does funny things to a man's brain.

Thanks very much!
Will Fletcher

Steve Kann wrote:

> 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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>
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-- 
Auburn University
Department of Computer Science
107 Dunstan Hall
Auburn, AL 36849
334-332-9544
fletchw at auburn.edu <mailto:fletchw at auburn.edu>
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