Dialed Number Identification Service (Dnis); Digital Wireless Telephone Support; Direct-In Lines (Dil); Direct Inward Dialing (Did) - Comdial DXP Plus Manual

GCA40–130

Dialed Number Identification Service (DNIS)

The DNIS feature allows the DXP Plus to read an inband DTMF digit string sent by a common carrier. It
uses this information to identify the telephone number the caller dialed and appropriately route the call.
DNIS is a service that long distance carriers make available for dial 800 and dial 900 number subscribers
on trunks that use E&M signalling over a E1 network. Also see the discussion titled Automatic Number
Identification (ANI).

Digital Wireless Telephone Support

The DXP Plus supports the operation of the Scout 900MX digital wireless telephone. The Scout 900MX
is a full-featured proprietary multiline telephone consisting of a wireless handset that lets the user roam
about and still make and receive telephone calls.

Direct-in Lines (DIL)

The direct-in lines (DIL) feature provides a line appearance at a dedicated button on one or more
multiline telephones. The programmer can assign a DIL to a proprietary single-line telephone where it
provides one-way (either incoming or outgoing) or two-way operation depending upon further
programming action.

Direct Inward Dialing (DID)

DID Hunting
When a DID call rings at a station that the programmer has disabled though programming action, the
system routes the call through the disabled station's hunt list until it locates a group intercom for the call
to ring. Should all group intercoms be busy or should no one answer the call in a programmed number of
rings, the system then routes the call along the station's call forwarding arrangement. With a hunt list
containing up to eight assigned group intercoms and access to each group intercom available to several
system stations, many users have an opportunity to service a DID caller. Coupling this flexibility with the
station's call forwarding ability, provides many chances for system users to service DID calls. A
programmer could program a hunt list and a call forwarding scheme to an unassigned station and provide
a designated DID termination and routing center. There would be no need to connect a telephone to the
station port to use the feature in this manner. The programmer could arrange several DID termination
centers to service different DID numbers. Each DID number could represent different calling categories,
and ring at different blocks of system stations (see Multipurpose Line Board for more information).

Direct Inward System Access (DISA)

DISA is a DXP Plus enhancement option that allows outside callers to directly call a station or access
certain internal system features, including all line groups and ARS. The system allows up to eight DISA
lines to be active at the same time. 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. The authorization and access codes are from one to six digits (including
pauses). You can use any of the digits zero through nine.
The system denies access, and routes a DISA call to a pre-programmed device such as a station telephone,
or proprietary voice mail, under the conditions listed below:
a caller dialing an invalid authorization code,
a caller dialing restricted or invalid features,
Comdial has taken reasonable steps in the design of all product features, including DISA, which protect
against unauthorized or fraudulent access to, or use of, a system, or which protect against unauthorized,
fraudulent or unaccounted-for access to, or use of, long distance lines. However, no system is entirely
66 – Understanding The Features
DXP Plus General Description