I successfully installed the 3CS PBX on a Windows XP computer to test the sytem and was sucessful. I am now trying to install the PBX on our main server which is a Windows Small Business Server 2003. When the install unpacks the information I am receiving an error message Port 5060: Socket Bind Failed: 10013 You must have ports 5060,5480,5481,5482 free. I have been able to confirm that the small business server does use 5060 for SIP communications but have been unable to find out how to change or modify so the PBX will load. I also set-up a pinhole in the router to allow 5060 and get the same message. Any ideas on how to get the PBX to load.