() Direct Dial Inwards a system where an office building, a hotel, etc. can have a large range of telephone numbers sharing one or a small number of direct lines. Calls go directly to an extension without being connected by an operator or receptionist .直接拨入（一种办公电话系统，多个电话号码共享一个或少数直拨线路。电话直接拨入分机而无需由接线员或接待员转接）➡DID