Specifications

8.22

Direct Inward

Dialing (DID)

support

The DID line board (DXPCO-DD4 and

DDS)

allows incoming CO

calls to reach internal DXP intercom extensions by direct dialing. No

attendant assistance is necessary. Since DID lines are incoming only,

their direct appearance is limited to attendant stations where status

indication may be useful. DID operation requires a group of published

directory numbers (400 maximum) provided by the telephone

company central office (CO). These directory numbers are incoming

only and the DXP translates them to the appropriate personal or group

intercom number for ringing. The lines will accept outgoing DTMF

digits during a call to support personal identification number dialing

and similar uses.

The DXP handles DID calls in the same manner that it handles regular

intercom calls and will forward them via a hunt list or a call

forwarding scheme. An unanswered DID call will either continue to

ring or route to a programmed ring no-answer (RNA) destination. If

neither forwarding nor RNA is available, the system provides no

routing.

The system returns a

ringback

signal to DID callers when a called

station is in the do not disturb (DND) mode. The system returns an

off-hook indication to the CO when a DID line is disabled. The DXP

synchronized ringing feature does not have any affect on DID calls,

and the Caller ID feature is not available.

Line Programming 8