We also recently had these installed at work - they are the most terrible VoIP phones I've ever experienced. My colleagues and I have had great difficulty with phones not ringing, calls getting dropped in transfer and phones not picking up calls! Although the phone handsets are built perfectly well (and I quite like the touch to hangup feature, as opposed to a mechanical hangup), they are not intuitive at all. In fact, I consider them to be extremely difficult to use, and I am a bit of a techno geek. The most irritating thing is that although the handsets have caller display, the numbers that are displayed have no relevance - they're not recognisable as extensions in my company. Calls transferred to me don't appear with the original callers number. You'd expect a company phonebook to be in the system, with every employees name so you could tell exactly who was calling you, and at the same time, could easily search for and call your colleagues. It appears that only a select few of my colleagues have this feature! A terrible VoIP phone, a massive comedown from the Cisco system we used at my previous employer.