[Asterisk-Users] OT: Multiple SIP phones behind NAT gateway?

[WipeOut .]

Hi,

I know this is slightly off topic but I figured the knowlege here is probably the best on the subject..

I want to setup remote offices with 4 to 6 SIP phones (SNOM 200) using ADSL and the internet to connect to the Asterisk box..

These phone will be behind an ADSL router using NAT...

I don't want to setup another Asterisk system in each office so IAX is not an option..

I could use static port mapping on the NAT gateway but I am not sure how to do this for 6 phones.. I guess I would have to allocate a seperate port to each.. Also this could have major security implications..

I could use a STUN server but I have not found a free one yet..

I could use an ADSL router with a built in SIP proxy/registrar but the only one I have found is the Intertex IX66 and they seem quite expensive..

Anyone got any ideas or thoughts?? or even better experiences..

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