Just purchased a Fanvil X5S to test, with high hopes it would be a good match for 3cx since they both recommend each other. Whilst it seems a great desk phone I've already come across a serious issue that would stop it being usable, that being the behaviour of the shared parking. Firstly the shared parking status isn't represented by a status light, so you wouldn't know by looking at it if it was already in use. Secondly, once you pickup a call from a shared park the phone thinks and behaves as if that call came from an extension, not picked up from a shared parking slot, i.e. you can't return the call to the parking slot etc. This would totally confuse my end users if I rolled it out to them. It's also a shame you can't provision all the buttons (first 4 are preset, 1 MWI, 2 Headset, 3&4 Your own extension line). It maybe for example you don't intend to use a headset. The headset button also has no visible indicator it's on or off. A few small firmware tweaks would sort this out, hope they happen soon, or it will be back to Yealink (which I love, was just looking for a slightly cheaper alternative). [On most up to date firmware etc.] Dave.