How much should it cost, roughly, to have one of these built into the wall of a room and hooked up to the phone system? This is for work rather than home. The phone system is in a cupboard on the ground floor, and this is for an office on the first floor, almost directly above the phone system. A 10 metre cable should be plenty long enough to connect it to the phone system.
We've been quoted £400 by a company but this seems a bit excessive!