When I try to provision a 3CXPhone for Windows v 12 I get the error message "3CXPhone for Windows cannot work in CTI mode because you need to have a valid registration to your 3CX Phone System. No calls will be possible in this mode. Register a phone to 3CX or switch 3CXPhone for Windows to SIP Phone mode". I do not need CTI functionality, but cannot find how I can switch to SIP Phone mode. Any help appreciated.