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D-8
D-8
General Description
This feature provides for all incoming calls from the public network (except FX or WATS) to reach any
system station without Attendant assistance.
Operating Procedure
The calling party, outside the system, dials the telephone number as usual. However, the call is answered
directly at a predetermined station, bypassing the Attendant.
Service Conditions
1.
This feature requires that special DID trunks and telephone numbers be obtained through the
local telephone company.
Note:
Not all telephone company Central Offices are capable of providing this service.
2.
If the Central Office numbering plan differs from the user's station numbering plan, addition or
deletion of digits can be implemented to coincide with the existing numbering plan.
3.
This feature is normally used when DIRECT-IN service is desired on an extensive or system-
wide basis.
4.
DID is also frequently referred to as CENTREX service.
5.
If the called station is nonexistent, the DID call is automatically routed to the Attendant or another
predesignated station. Calls to invalid numbers can be routed to an Attendant or to a recorded
announcement. See CALL FORWARDING - INTERCEPT/ANNOUNCEMENT [C-25].
6.
Wink-start or delay-start signaling is recommended for use in conjunction with this feature.
7.
The DID trunk contains a switchable 2db transmission pad that is switched in or out via software
control.
8.
If DID trunk is immediate start, dial pulse is required.
Interactions
1.
Incoming calls have priority over outgoing calls. When a register is assigned as an Outgoing
Register Trunk (ORT), it will also act as an Incoming Register Trunk (IRT) if no IRTs are
available. Therefore, ORTs can act as IRTs, but if IRTs are programmed, they will not act as
ORTs.
2.
If immediate Start DID trunks are required, Incoming Register Trunks must be programmed in
the same local processor as the DID trunks.
3.
CALL FORWARDING [C-2, 3, 5]: When a station has activated a Call Forwarding feature (CALL
FORWARDING - ALL CALLS [C-5], CALL FORWARDING - BUSY LINE [C-2], CALL
FORWARDING - DON'T ANSWER [C-3]), the DID call is forwarded to a designated station
rather than to the specific station dialed.
4.
STATION HUNTING [S-7, 8, 9]: If the called station is arranged for this feature and is busy, the
call follows any prescribed hunting pattern.
5.
CALL WAITING - TERMINATING [C-12]: If the called station has the Call Waiting - Terminating
feature, Call Waiting Ringback Tone to the calling party is provided when the called station is
busy. The called station hears a 2-burst Call Waiting Tone. Call Waiting is allowed in
CDN 46:CW, of ARDT command.
Page 200
Direct Inward Dialing (DID)
Direct Inward Dialing (DID)
NEAX2400 ICS Business Features and Specifications
NDA-24143, Issue 4
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