For all you CTI hounds, there's a TAPI version of the phoneset, which lets you plug your phone into your PC for popping customer records when calls come in. TAPI support is provided through a standard DB9 serial interface special to this version. As I mentioned, there is verbal help available for users on every feature. Even when you have someone on the phone and are trying to figure out how to transfer him, you can put the caller on hold and get help. No more unused feature keys because someone forgot his training.
Help is available for both end users and installers.
Or you can go with your own. It should suffice for the needs of a busy sales office or a small adjunct call center to a business.