Instruction manual

Direct Inward System Access Page 1303 of 3156
Features and Services
Only trunks that give disconnect supervision can be used to provide access to
DISA. Therefore, trunks dedicated to DISA (CO, FX, or WATS) must have
a ground start signaling arrangement. Incoming DISA calls on trunks without
disconnect supervision will not be allowed. For these calls, overflow tone is
given to TIE, DID, and Common Controlled Switching Arrangement (CCSA)
trunk calls, and calls on CO, FX, and WATS trunks are intercepted to the
attendant.
Trunks dedicated to DISA may also be used as normal outgoing trunks.
Feature interactions
Access Restrictions
Access restrictions are assigned to the DISA DN as they are to any station
within the system. Separate access restrictions are also assigned to
authorization codes used by DISA callers.
Attendant Busy Verify
Busy Verify
Attendant Busy Verify applies only to DNs within the system. If an attendant
tries to use the feature to enter a DISA DN, overflow tone is returned.
Basic/Network Alternate Route Selection (BARS/NARS)
The BARS/NARS features function on a DISA call as if it had been
originated from inside the system.
Basic/Network Authorization Code (BAUT/NAUT)
This feature can be used in conjunction with DISA to allow a user access to
more resources than are normally available. The Authorization Code must be
entered, in addition to the security code (if required), using the applicable
Special Prefix (SPRE) code followed by the authorization access code 6, or
by an applicable Flexible Feature Code. If authorization codes are required, a
valid Authorization Code must be entered after the DISA security code (no
SPRE code is needed).
Call Forward/Hunt Override Via Flexible Feature Code
DISA is not supported. Any attempt to dial the Call Forward/Hunt Override
via Flexible Feature Code will be ignored and access denied treatment will be
returned.