Instruction manual

Page 1302 of 3156 Direct Inward System Access
553-3001-306 Standard 10.00 January 2002
• Call Detail Recording (CDR) and Call Detail Recording Charge
Account, and
• Basic/Network Alternate Route Selection (BARS/NARS) and
Automatic Number Identification (ANI) route selection.
Each special Directory Number (DN) dialed by a DISA user is associated
with a particular DISA Directory Number. Any number of DISA DNs can be
assigned, provided that they are consistent with the numbering plan of the
customer. Access rights are determined by the Class of Service and Trunk
Group Access Restrictions (TGAR) associated with the DISA number. Calls
to DISA can be placed on dedicated, auto-terminate incoming trunks (Central
Office [CO], Foreign Exchange [FX], or Wide Area Telephone Service
[WATS]) and TIE or Direct Inward Dialing (DID) trunks, all of which must
have proper supervision.
As a safeguard against unauthorized use, an authorization code or special
security code of one to eight digits can be assigned for each DISA DN. The
security code must be entered before any system resources can be used.
Additionally, a secure data password can be provided to enable the customer
to create, modify, or remove information concerning DISA.
Operating parameters
The features not available to DISA users are those that require a switchhook
flash (such as Call Transfer, Conference, Hold, or Ring Again). Also
unavailable are features requiring that predefined data be assigned for the DN
(e.g., Speed Call), and other features that are not applicable to DISA calls
(such as Call Pickup and Call Forward).
Any CO, FX, or WATS trunk route can be designated as an auto-terminate
route, allowing incoming calls in the route to terminate on one particular DN
rather than going to the attendant. Several trunks can specify the same DISA
DN, or each trunk can specify a different DISA DN.