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Date:      Wed, 27 Sep 2017 09:51:25 +1000
From:      Graham Menhennitt <graham@menhennitt.com.au>
To:        freebsd-ipfw@freebsd.org
Subject:   Re: FreeBSD, IPFW and the SIP/VoIP NAT problem
Message-ID:  <76cb9b72-53ac-eadc-f921-dc01808a9aeb@menhennitt.com.au>
In-Reply-To: <20170926143503.66f6532c@freyja.zeit4.iv.bundesimmobilien.de>
References:  <20170926143503.66f6532c@freyja.zeit4.iv.bundesimmobilien.de>

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On 26/09/2017 10:35 PM, O. Hartmann wrote:
> Hello,
>
> trying to build a FreeBSD based router/PBX (Asterisk 13) appliance, I ran into
> several problems. My questions might have a "noobish" character, so my apology,
> my experiences with IPFW are not as thorough as they should be.
>
> ...

> The FreeBSD system acting as a router is supposed to have a jail soon
> containing the Asterisk 13 IP PBX (at the moment running on the main system).
> To provide access to the VoIP infrastructure inside/behind the router/NAT
> system, the in-kernel NAT facility of FreeBSD is forwarding the relevant
> UPD/TCP ports for VoIP to its destination network, and here I have a problem to
> solve.

Does your VoIP provider allow IAX2 protocol as well as SIP? Many do. 
Then you can avoid the problem completely.

Graham



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