These are easiest to use, show caller ID and identify which department or company name you should answer in.
These are ideal as courtesy phones for reception or for seldom used meeting rooms.
These are for front/back doors or gates and improve security whilst letting you answer and release from phones.
EG: Fax, credit card machines, payphones, loud bells, franking machines, analogue modems, cordless phones, answering machines.
Hover over the feature for more details.