I too use a 3CX system. After a few bumps early on, it has been smooth sailing the past couple years.
The things you can do with a VOIP system are remarkable.
Some feature I like include: pulling up a virtual phone on my tablet as I'm in a room and need to call a pharmacy for questions etc ... can do right with the patient. There is also an iPhone/iPod app for the 3CX... can turn it into another phone extension.
You can monitor your lines in action with the 3CX MyPhone program (review call histories, active calls, etc) and transfer calls with a click and drag of the mouse/pointer.
