Iptables breaks a working VoIP phone?

Hans Fugal hans at fugal.net
Mon Nov 12 06:41:38 MST 2007

Thanks for the report. It's good to know the sip conntrack stuff can
conflict with other nat approaches.

On Sat, 10 Nov 2007 at 15:07 -0700, Kenneth Burgener wrote:
> Kenneth Burgener wrote:
> > Hello.
> > 
> > I made a switch in my firewall device, and now my Broadvoice VoIP
> > connection is having some issues.
> Just wanted to do a quick follow up on this issue.  I was able to
> resolve the issue, after some discussion on the shorewall lists.  The
> cause of the problem happened to be the iptables modules ip_nat_sip and
> ip_conntrack_sip.
> I assume the purpose of the modules are to help a dump sip device work
> with NAT.  The problem is, I assume again, that Broadvoice had
> configured the Sipura ATA device to work with NAT out of the box, so the
> two were conflicting.
> After disabling the modules, my phone now works wonderfully.  No port
> forwarding necessary at all.
> Thanks all who gave suggestions and ideas.
> Kenneth
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Hans Fugal ; http://hans.fugal.net
There's nothing remarkable about it. All one has to do is hit the 
right keys at the right time and the instrument plays itself.
    -- Johann Sebastian Bach
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