VoIP and IPFW

[Maksim Yevmenkin]

Gary Corcoran wrote:
> Maksim Yevmenkin wrote:
> 
>> Hello,
>>
>>> I'm considering testing the Vonage service, with my FreeBSD-4.10
>>> system (maybe 5 or 6). I wonder if anyone here has a configuration
>>> they can share, or if there are any pages out there that detail the
>>> proper (and secure) setup.
>>
>>
>>
>> i'm using lingo (www.lingo.com) - very similar to vonage. i use 
>> freebsd 4.10 as my firewall/nat/wireless access point/etc. the lingo 
>> box in behind freebsd box. it gets its ip (local) via dhcp and then 
>> talks to the lingo servers (via nat). it seems both providers are 
>> using sip, so i did not have to open anything on my nat/firewall, 
>> because the lingo box initiates the connection from the inside.
> 
> I can understand how you can do outgoing calls behind a NAT firewall,
> because you initiate the connection.  But can you receive *incoming*
> calls?  Or are you always "connected" to the VOIP provider, and thus
> your firewall/reverse-nat is always open/setup?

yes, the lingo box is 'always "connected"', so incoming calls work just 
fine. one more thing - i had to give ntp servers list in the dhcp 
response to the lingo box, otherwise caller id time was way off :)

max