Direct Inward Station Dialing

rrvyra

111,111, ,y

IIICirl~1GIIUCIIII

rGcJ,“IGa

The direct inward stationdialing (DISD) featureallows an external party to call an intercom stationdirectly without assistancefrom the at- tendantif the call is madeover a line programmedfor that purpose. As the systemattendant,you may instructcallersto make DISD calls when necessary.

For example,if a caller regularly dials a numberthat rings at the attendant’sstationfor service,you may give the caller the DISD line numberand theextensionnumberassociatedwith the stationhe is trying to reach. Futurecalls from the caller to a specific party will not haveto be servicedatthe attendant’sstation,althougha ring-no answer or busy condition at the called party’sstationwill resultin the system’s handling thecall in anothermanner(describedbelow).

When a caller makesa DISD call from an outsideline, he or shewill in- itially hearringing. The systemwill answerthe call with a DISD con- tinuous dial tone;the caller canthendial an extensionnumber.

-If called station is idle, a tone is soundedandcalled stationrings.

-If the call is answered by another station user, the caller can askfor transferto desiredstation.

-If ringing stops anddial tonesoundsagain,the caller candial another extensionnumber.

-If called station has callforward featureset,forward stationrings.

-If calied’station is busy, call is placedon hold andcamped-onatbusy station. If camp-on is not answered within a transferrecall timeout period,busytone is given, followed by a DISD dial tone.

Note: The system will return the caller to DISD dial tone two additional times and then drop the line.

- If called station is busy but ispartof a huntgroup, DISD call is routed to idle stationin huntgroup,if available;otherwise,thecall is camped- on at dialed station. Hunt group is not followed when caller hears ringing but receivesno answer.

- If an invalid extension number is dialed, an error tone is sounded before DISD dial tone is returned(caller can redial). If mistake in dialing is made, caller candial +Kfor new DISD dial tone.

Note: The system will return the caller to DISD dial tonetwo additional times and then drop the line.

-If extension number dialing is not completed within the programmed dial time limit, call is routed to DISD assist station if available;

otherwise,the line is dropped.