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 From:  "Christopher M. Iarocci" <iarocci at eastendsc dot com>
 To:  "Mitch (WebCob)" <mitch at webcob dot com>
 Cc:  'David Drysdale' <david dot drysdale at vision dash networking dot ca>, m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Sip VoIP with no DMZ
 Date:  Mon, 18 Oct 2004 14:05:38 -0400
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