I've run SIP through NATed tunnels using linux systems in the past and
had no problem.

This was done using redhat 9.0:

<xLite>----sip----<Linux Router>----sip----<Asterisk VoIP server>

Currently, this is my setup for the phones:

<Motorola TA>----sip----<m0n0wall>----sip----<Vonage Phone Service>

Even the QOS rules work on the TA, and I don't have a problem with one
way calling. Sometimes, SIP phones will automatically send packets to
keep a NAT device open. You should probably check if your phone supports
this type of options. I know that in xLite there is an option for this.



On Mon, 2004-10-18 at 13:34, David Drysdale wrote:
> It is a very strange problem. The SIP protocol seems to be very picky.
> Hopefully someone will have a solution. I am going to remove all my voip
> settings and enter them again to be sour I didn't make a mistake. I do hope
> I can get this working as I love everything about monowall. It is one
> amazing open source project. 
> 
> -----Original Message-----
> From: Christopher M. Iarocci [mailto:iarocci at eastendsc dot com] 
> Sent: Monday, October 18, 2004 3:06 PM
> To: Mitch (WebCob)
> Cc: 'David Drysdale'; m0n0wall at lists dot m0n0 dot ch
> Subject: Re: [m0n0wall] Sip VoIP with no DMZ
> 
> Mitch (WebCob) wrote:
> 
> > 
> >  
> >
> >>From you archives other people have had SIP working with monowall. But all
> >>I
> >>could find had a dmz. Do any of you know of another way to use it? Could I
> >>use 1-to-1 nat with only one public IP? Thanks in advance for the help.
> >>
> >>
> >>    
> >>
> >
> >I'm not an expert on this, but we have started evaluating a couple of VoIP
> >suppliers and one of the two was boasting that their worked behind NAT... I
> >haven't run the software yet, but the other vendor said it couldn't be done
> >so it's possible:
> >a) there are two modes of sip - like active and passive ftp?
> >b) there are built in kernel level proxies like the ones various os's
> >include for FTP which monitor the command channel to properly map the
> >inbound data connections.
> >
> >Would like to know for sure though ;-)
> >
> >m/
> >  
> >
> Vonage works behind NAT with only port mappings without issue.
> 
> Chris
> 
> 
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