In this example, calls received on trunk 01 are routed to the DISA OGM with floating extension number 501.
If the number of the received call (after modification according to the Caller ID table) is "12341115678
call originator is recognised as extension 200, and the Walking COS feature is automatically activated.
System programming is required to enable this feature.
The call information for DISA is recorded as the one of the DISA floating extension numbers. (®
A DISA call from an outside party is received.
No
Is there a port available?
Yes
The PBX answers the call.
The OGM plays and the PBX starts to 
receive the DTMF signalling.
Yes
The OGM stops.
No
Is a second digit dialled?
Is the first digit dialled?
Yes
Is the first dialled digit assigned a 
destination for the DISA AA service?
The call is routed to the destination.
Yes
The PBX receives the dialled 
digits and checks the dialled 
number.
No
What is the DISA security mode? 
Continued on next page
F
A
The call is routed to an operator,
etc. (DISA Intercept   when All 
DISA Ports are busy)
(DISA Mute & OGM Start Time 
after Answering expires)
(DISA Delayed 
Answer time expires)
(DISA Second Digit Time for 
Automated Attendant expires)
No
What method is assigned for 
DISA Intercept Routing   No Dial?
Operator Disable AA-0, AA-9
The call is 
disconnected.
The call is redirected to 
the destination assigned 
to AA-0 or AA-9. 
The call is routed to an 
operator.
(DISA First Digit Time 
When No Dial expires)
C C