Product specifications

4-12
Chapter 4
Business Feature Package
DIRECT INWARD DIALING (DID) E1/COPPER
The term Direct Inward Dialing or DID refers to four types of digit steered inbound call handling.
These are DID, Both Way DID, Dialed Number Identification service (DNIS and Direct Dial In (DDI).
The iDCS 100 supports all four types as described below.
DID is an inbound only service where multiple telephone numbers are assigned, usually in blocks of
twenty, to a single circuit or small group of circuits. These circuits can be single pair analog circuits
that will terminate on a DID card. The iDCS 100 DID card supports up to four circuits. In addition the
DID circuit can be a channel on a digital E1 service terminating on an iDCS 100 TEPRI card.
Both way DID is a service that combines DID service with normal outbound local telephone service.
This service is provided over E&M tie line circuits. These E&M tie line circuits can terminate on either
the iDCS E&M card or on a channel of a digital E1 circuit on an iDCS TEPRI card.
Dialed Number Identification service (DNIS) is a feature of 800 or 900 type numbers that allows the
number dialed by the caller to be identified in the telephone system by means of a sequence of DTMF
digits (usually four). This service terminates on E&M tie lines. These E&M tie line circuits can
terminate on either the iDCS E&M card or on a channel of a digital E1 circuit on an iDCS TEPRI card.
Direct Dial In (DDI). This is the name given to the above three services when they are provided over
an ISDN PRI circuit.
DIRECT INWARD SYSTEM ACCESS (DISA)
Users can call in on specific DISA lines at any time, input a security code and receive system dial tone.
Users can now place internal calls or if permitted, calls using C.O. lines. The caller must have a tone
dial phone and know his/her DISA security code. DISA lines can be used as both way lines or
incoming only and may be active in day mode, night mode or both. The C.O. lines used for DISA
must have disconnect supervision.
DIRECT TRUNK SELECTION
Each station can be allowed access to or denied access from a trunk or trunk group by access code
when LCR is activated. When restricted, the station user must use a trunk key or a route key.
DIRECTORY NAMES
Each station, station group and C.O. line may be assigned a directory name (maximum 11 characters).
In addition, each personal speed dial number, system speed dial number and entry in the DID
translation table may be assigned a name (maximum 11 characters). These names are displayed
during calls with these ports and in the case of station and speed dial names, can be used to originate
calls. See the Dial by Name feature (Station Features).
DISA SECURITY
Telephone fraud and long distance theft are a serious concern. The iDCS 100 provides a strong DISA
security system. If an incorrect DISA passcode is entered repeatedly (as is the case with “hackers”),
the DISA system can be automatically disabled temporarily. Both the number of incorrect passcode
attempts and the time that DISA is disabled are programmable. In addition, all failed attempts to
access DISA print on SMDR (if provided) with a “DE” DISA error flag.