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Date:      Sat, 02 Dec 2006 14:22:17 +0000
From:      Joe Holden <joe@joeholden.co.uk>
To:        Kurt Dethier <kurt-list-freebsd@androme.com>
Cc:        freebsd-questions@freebsd.org, Marwan Sultan <dead_line@hotmail.com>
Subject:   Re: VoIP behind NAT and FreeBSD
Message-ID:  <45718C19.2000809@joeholden.co.uk>
In-Reply-To: <45718A77.3090107@androme.com>
References:  <BAY104-F30F0B4D35C184F62F5B789AD90@phx.gbl> <45718A77.3090107@androme.com>

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Kurt Dethier wrote:
> Marwan Sultan wrote:
>> Hello All,
>>
>>  Well, maybe the subject says all,
>>  Im running 6.1R acting as NAT, gateway ofcourse, hotspot.
>>  I have many clients trying to use Vonage, motorola, VoIP devices and
>>  and few more products.
>>
>>  The problem is as its described in some websites..
>>  They can call, receive a call, hear the dailtone but no one can hear
>> the other party.
>>
>>   After researching i found out there is a problem iusing FreeBSD NAT
>> with voip protocols.
>>
>>   i have been advised to use STUN servers, (Simple Traversal of UDP
>> through NATs.)
>>   I found out there is net/stund port and its installed successufly!
>>   but still lost.
>>
>>   Can someone kindly and please shade a light on howto
>>   make voip behind NAT works in my FreeBSD ? im in trouble because of
>> this.
> 
> Hi Marwan,
> STUN will only work if you have the correct NAT implementation on
> your gateway. If you are using pf, you get what the STUN RFC calls
> a symmetric NAT. STUN will not help you in such an implementation.
> I'm not sure how the other NAT solutions on FreeBSD are implemented.
> 
> If you need a solution for a symmetric NAT, you need something that
> understands the signaling protocol and can add fw/nat rules on demand
> on your gateway, or a media proxy (like TURN).
> 
> Kurt

It is entirely possible to use voip behnd symmetric nat, but it also
entirely depends on the setup, some more details will help.

Ta,
Joe



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