Vertical Communications DSU II - Manual (Page 53)

D
Data Interface Unit (DIU)
This optional unit provides connections for your standard multiline digital telephone and
Industry Standard Telephone (IST) device such as a FAX machine or answering machine.
Departmental Station Operation
The operation of stations that are organized into departments.
Dial By Name
This feature allows users to employ any two-line display, LCD speakerphone and its interactive
buttons to search through an index of names, locate a desired station name or system speed dial
name, and automatically call the located item.
Digital Voice Announcing (DVA)
The DVA is a line-powered device that provides voice prompts for auto-attendant and transfer, or
you can use it to enhance the operation of DISA and Tracker.
Direct Inward System Access (DISA)
An enhancement option that allows outside callers to directly call a station or access certain
internal system features, including all line groups and ARS. To prevent fraudulent access and
unauthorized use, the caller must use an authorization code and system access code to gain access
to outside lines as well as many of the advanced telephone features.
Direct Inward Station Dialing (DISD or DID)
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)
Programmable buttons which allow the user one button to place intercom calls to other stations
within your system; 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. See telephone layout
drawings in Chapter 1 for location.
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
E&M Tie Lines
In telephony, a separate pair of leads to your station which are used by system operators for
signaling and supervisory purposes.
Single Line Proprietary Telephone Station User’s Guide 47
GCA70-246 Glossary