I have a V9 system. we switched isp and of course switched external ip addresses when that happened. I altered the ip address in the config to reflect the change and set all my firewall forwarding rules as required. now i get an interesting problem. when you call our number you get silence.. then after about 60 sec you get all phones are busy message. If you enter and known prompt the call will be put through to that extension or call group. If i change the default incoming rule to a extension the extension will ring. as normal you can make outbound calls perfectly. If i put the stun server on the greeter will work and everything is fine but you can not make outbound calls. and after about 30 sec any incoming call will be dropped. and if you try to make outbound calls they fail with a FORBIDDEN error. i don't know whats going on none of this makes any sense to me.. I'm new to 3cx and this is my first experience doing anything with the system other than changing names and numbers for extensions.