jason2nl

I have installed the Axon PBX and have 3 soft phones and a SPA3000 on my LAN working. Is it also possible to have an other SPA3000 somewhere on the internet connected to my private telephone network ? I want the outsite SPA3000 only to connection with a phone on my private network without a third party. If this possible with Axon, how can do this ? Do I have to configure NAT in my ADSL internet router ? If yes, which port ? Thanks in advance.