Hi timvanzee
I would suggest that if possible always go for Supported Phones, depending on User preferences those can be Snoms, Yealinks, Fanvil or Htek. A supported phone means that the phone has been tested with the default templates on the System by R&D it has been found to work as expected. We are also very familiar with the phones so we can advise accordingly. When using an unsupported phone, we have no way of knowing whether that phone works correctly and does what it is supposed to do and in that case the phone manufacturer will have to help you out if you have issues, given a choice always go with a preferred/reccomended phone over an unsupported phone the list is here at www.3cx.com/support so that should make choosing a bit easier. For any other questions or inquiries please feel free to let us know