"Welcome to the Ministry of Magic. Please state your name and business."
Inside, there is a telephone that hangs crooked against the wall; one needs only to lift the receiver, dial 6-2-4-4-2, state your name and business and then the box will sink down into the Ministry. Square silver badges with your name on them appear in the coin return and visitors are asked to register at the security desk (OP7).
The code which is punched into the telephone is 6-2-4-4-2. On an old-style telephone keypad, those numbers correspond to the letters M-A-G-I-C.