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 From:  "David Drysdale" <david dot drysdale at vision dash networking dot ca>
 To:  <m0n0wall at lists dot m0n0 dot ch>
 Subject:  RE: [m0n0wall] Sip VoIP with no DMZ
 Date:  Mon, 18 Oct 2004 15:34:19 -0300
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
>>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 ;-)
Vonage works behind NAT with only port mappings without issue.


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