Vertical Communications DSU and DSU II manual Direct Inward Station Dialing

Programming The Attendant Features GCA70–245

2.3 Direct Inward Station Dialing

The direct inward station dialing (DISD) feature allows an external party to call an intercom station directly without assistance from the attendant (over a line programmed for DISD). As the system attendant, you may instruct callers to make DISD calls when necessary.

You may give the caller a DISD line number and the extension number associated with the station he or she is trying to reach. Future calls from the caller to a specific party will not have to be serviced at the attendant’s station, although a ring-no answer or busy condition at the called party’s station will result in the system’s handling the call in another manner (described below).

When a caller makes a DISD call from an outside line, he or she will initially hear ringing. The system will answer the call with a DISD continuous dial tone; the caller can then dial an extension number.

•If called station is idle, a tone is sounded and called station rings.

•If the call is answered by another station user, the caller can ask for transfer to desired station.

•If ringing stops and dial tone sounds again, the caller can dial another extension number.

•If called station has call forward feature set, forward station rings.

•If called station is busy, call is placed on hold and camped-on at busy station. If camp-on is not answered within a transfer recall timeout period, busy tone is given, followed by a DISD dial tone.

2–6 LCD Speakerphone Reference Manual