Technical data

Direct Inward System Access (DISA) 5-51
Chapter 5: CO/IP
MBX IP Description / Operations & Programming Guide
Direct Inward System Access (DISA)
Each CO/IP path may be assigned for DISA Service, which allows an Incoming Caller to gain
access to System resources and/or features. The System will answer the outside call and
provide the User Intercom Dial tone or route the call based on the VMIB Auto Attendant
announcement settings where Caller Controlled Routing (CCR) may be defined. The DISA
caller may then access the desired resource using dial codes.
If an Authorization Code is required for DISA access, when the System answers an Incoming
DISA call, DND Warning tone is provided to indicate an Authorization Code must be entered.
CONDITIONS
- Each CO/IP path is separately assigned for DISA Operation during Day, Night and/or
Timed System Operation modes. DISA operation is active only when the System is in
the assigned operating mode(s).
- A DISA Caller can be required to enter an Authorization Code to access System
external outgoing resources, facilities or features. If required, the caller is permitted to
retry entry of a valid Authorization Code based on the DISA Retry count (continued
failure will cause disconnection).
- DISA callers are subject to COS dialing restrictions. If Authorization Codes are
required and the code matches a Station Authorization Code, the Station COS will
apply.
- The System will disconnect an Outgoing DISA call if the Unsupervised Conference
timer expires or Disconnect Supervision is received; a Disconnect Warning tone is
provided 15 seconds prior to disconnect.
- If a DISA caller encounters a System All Lines Busy, Busy tone is received for 5
seconds before ICM Dial tone is presented again and the DISA caller may try another
call.
- LEDs associated with the DISA CO Line appearance will provide normal status
indications at all Stations except Attendants; the LED for the line at an Attendant
Station will flutter at 240 ipm when Busy.
- If a DISA Caller accesses a CO/IP Line, the Transit option is applied (CO to CO
Attribute); this function can make a call recovered after conversation during an
assigned time.
Release 1.0
November 2010