Hi, I am new to 3CX, but currently successfully operate an asterisk based system and have successfully implemented our SIP carrier and softphones (linksys) on that platform, we also use X-lite and have had great luck. We need an easier to manage system so I was interested in this one. So, here's where we are: 1. New Instance of Windows Server 2008 R2 installed in a data center with 10MB connection and all appropriate (I think) firewall ports open 2. clean 3CX install 3. SIP provider is registered and DID is accepting calls to 3CX, I can route to specific functions and it seems to be working. 4. None of our extensions, softphones or phones will register. I even tried the 3CX iphone app.... Anybody have any ideas ? Happy to share our results here. Thanks !