Panasonic KX-TDA50 Feature Manual page 241

[Receiving a Call through a TIE Line]
PBX Code Method
(Access with PBX Code)
Does the modified number
contain the PBX code
assigned to this PBX?
Yes
Modifies the number
by removing the PBX code.
The PBX checks the modified number to determine what kind of number it is.
Operator Call No.
Directs the call
to an operator.
Does the
corresponding
extension
No
extension idle?
Call Waiting
Busy tone
Intercept Routing
Busy/DND
Calls the extension.
Document Version 2010-11
A call is received via a TIE line.
The Incoming Number Modification Table
checks the CO line port carrying the call,
and modifies the number according to the
method assigned for that port.
Does the PBX have
Yes
a PBX code (Own PBX Code)
assigned to it?
No
(found in the flowchart,
[Making a Call via a TIE
Line from an Extension])
Extension No.
of this PBX
To
(found in the
flowchart,
[Making a Call
No
via a TIE Line
from an
exist?
Extension])
Yes
Is the
Sends a reorder
tone, or sends the
Yes
call to an operator
(Intercept Routing
No Destination).
13.1.13 PRIVATE NETWORK FEATURES
(Access without PBX Code)
A
To
Extension No.
Idle Line
of Another PBX
Access No.
or
A
Trunk Group
Access No.
PBX checks the Class of Service (COS)
of the incoming trunk group.
Is the outgoing trunk group
programmed to allow calls
from this COS?
Does
Toll Restriction (TRS) allow
this COS
to make this call?
Sends the call to the CO line.
Extension Number Method
No
Other
Reorder tone.
No
Reorder tone.
Yes
No
Reorder tone.
Yes
Feature Manual 241