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2.16.1 Direct Inward System Access (DISA)
[Flowchart]
A DISA call from an outside party is received.
Is there a port available?
The PBX answers the call.
A
The OGM plays and the PBX starts to
receive the DTMF signalling.
F
Is the first digit dialled?
The OGM stops.
Is a second digit dialled?
The PBX receives the dialled
digits and checks the dialled
number.
What is the DISA security mode?
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168
Feature Manual
(DISA Delayed
Yes
Answer time expires)
(DISA Mute & OGM Start Time
after Answering expires)
The call is routed to an
operator.
Yes
Yes
No
No
The call is routed to an operator,
etc. (DISA Intercept when All
DISA Ports are busy)
No
(DISA First Digit Time
When No Dial expires)
What method is assigned for
DISA Intercept Routing No Dial?
Operator
Disable
The call is
disconnected.
C
No
(DISA Second Digit Time for
Automated Attendant expires)
Is the first dialled digit assigned a
destination for the DISA AA service?
Yes
The call is routed to the destination.
AA-0, AA-9
The call is redirected to
the destination assigned
to AA-0 or AA-9.
C
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