IP Phone User Manual
1.16 Optional Device Features
Feature Guide 157
Is the correct 
personal identification number 
(PIN) entered?
No
Yes
Is the extension 
busy (Call Waiting 
mode on) and is 
not in DND mode?
Yes
No
The extension 
receives the call.
The call waits 
to be received.
The extension 
becomes idle.
Yes
No
Goes to 
A
No
Yes
The call is established.
(DISA Intercept Time
 Time-out)
The call is routed to the 
intercept destination.
(DISA Intercept Routing 
No Answer)
Does the destination 
answer the call?
Does the 
destination 
answer 
the call?
No
Yes
The call is established.
(DISA Disconnect 
Time after Intercept 
Time-out)
The call is disconnected.
E
Goes to 
E
Outgoin
g 
Message
(OGM)
Intercept Routing
Busy Tone
What method is assigned 
for DISA Intercept 
Routing Busy/DND?
(Busy Tone 
Time Time-out)
Goes to 
The call is disconnected.
No
A
The call is routed to 
the intercept destination.
(Intercept Routing Busy/DND)
The message for 
the busy/DND mode 
is sent to the caller.
Yes
Goes to 
F
Goes to 
E
*: 
Feature numbers are available only when the Walking COS feature is used for Security Mode Override.
Does the caller press 
while hearing busy 
tone (Call Retry)?
Does the caller press 
while hearing reorder 
tone (Call Retry)?
Does the caller press 
while hearing a ringback 
tone (Call Retry)?
Is the extension idle?
Is the Walking COS/Verified 
Code Entry feature number dialled 
for Security Mode Override?
Yes
No
No
NoneNoneNoneNoneNone All SecurityTrunk Security
Yes
Is the dialled number 
an extension number or 
floating extension number?
Yes
No
Extension No./
Floating 
Extension No.
What is the dialled number? 
Feature No.*
(e.g., FWD)
The feature is set. 
Trunk Access No.
+ Telephone No.
Others
The dialled number is sent to the trunk.
(DISA Reorder Tone 
 Duration Time
 Time-out)
Goes to 
Goes to 
Goes to 
Goes to 
Reorder tone 
Yes
No
A
B
B
C
C
D
D
No Security
The call is disconnected.
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