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The control Enter the correct password and the character . If the password is valid, a long tone is heard which lasts for the preset time (usually 5 s). During this time, switch 1 or switch 2 is closed, (switch 1 usually controls the electric lock). If the password is invalid, the door communicator sends the "refusal" signal. 6.2. The classic button telephone In this mode, it is possible to "dial" an arbitrary number. The key serves is used to hang up. Authorisation for "outgoing" calls for pick up and the key must be cancelled if needed at the branch telephone exchange. The dialling type (tone, pulse) is set in the programming mode. If pulse dialling is set, the character functions (after picking up) as transition to tone dialling - similarly as on any other telephone. 6.3. Transmission of tone dialling during an outgoing call This function allows to send the tone dialling after establishing connection with one of the programmed numbers. It is used in combination with automatic information systems, voice boxes etc., which require from the calling person selection of a service using tone dialling. This function thus does not allow to reach other than programmed numbers. 19