Features and Specifications Manual D - 31
Direct Inward System
Access (DISA)
D-10
FEATURE
DESCRIPTION
Direct Inward System Access (DISA) allows an outside caller to access the
system from an outside line without Attendant or station assistance. The
outside user may originate a call over any system facility such as a Tie line
network or CO/PBX trunk after successfully entering a password.
SYSTEM
AVAILABILITY
Terminal Type:
Not applicable
Required Components:
VRS(4)-U10 ETU to hear a message telling the caller which digits to enter for
DISA access. A message is not required for DISA to work.
OPERATING
PROCEDURES
1. Dial the desired number to connect to the system.
2. A special tone is heard after ringback tone. When a VRS(4)-U10
ETU is programmed for DISA, a voice announcement can be
provided instead of a special tone.
3. Dial the DISA Access Code.
• When accepted, internal dial tone is heard.
• When denied, error tone is heard.
4. Dial the DISA ID code (Station Number).
5. Dial the password.
6. Dial a Trunk Access Code and the desired outside number.
To place a call using DISA:
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