Glossary

GCA70–245

Departmental station operation: The operation of stations that are organized into departments.

Direct Inward Station Dialing (DISD): This feature allows an outside party to call an intercom station directly without an attendant’s assistance.

Direct Station Selection/Busy Lamp Field (DSS/BLF): Using one button to place intercom calls; the button is sometimes referred to as a DSS button. Busy lamp field or BLF is a term for a light that identifies current call status of DSS station.

Do not disturb: A mode that disables incoming call ringing and intercom calling.

Dual Tone Multiple Frequency (DTMF): The tones made by your telephone when you dial.

Dynamic line button: System temporarily assigns a normally unassigned line to an idle line button for certain call handling operations.

E

Exclusive hold: Only the telephone placing the call on hold can retrieve it.

Executive override: Breaking into a conversation at a busy called telephone. This intrusion is announced by several quick tone bursts over the conversation.

H

Handsfree answer inhibit: A telephone can be set to block voice calls sent to it over the speaker.

Hookflash: Action that occurs when the TAP button is pressed. Needed for activating host system features.

Hookswitch: The switch on a telephone which, when depressed manually or by the handset, disconnects a call.

K

Keypad: Buttons 0 through 9, and # used for dialing.

L

Last number redialing: Automatically dialing the last number dialed.

G–2 LCD Speakerphone Reference Manual

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Vertical Communications DSU and DSU II manual Glossary GCA70-245