Panasonic KX-TDA50, Features Manual

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1.25 Networking Features
188 Feature Guide
1.25.1.2 PBX Code Method (Access with PBX Code)
Description
PBXs on a private network can be distinguished from each other by assigning a PBX code to each one.
When a PBX makes or receives a TIE line call that contains a PBX code, it can recognize right away if it
should handle the call itself or pass it on to another PBX. If each PBX on a private network has a PBX code,
the extension numbers used in one PBX can also be used again in another PBX.
If a PBX is assigned a PBX code, it will look for PBX codes when receiving calls on TIE lines; if a call does
not contain a PBX code, it will not be handled correctly.
Using PBX codes to make or receive calls via a TIE line is called "PBX Code Method (Access with PBX
Code)".
1.
Programming for PBX Code Method (Access with PBX Code)
Each PBX in the private network will refer to some or all of following tables when making and receiving
calls via TIE line using PBX Code Method (Access with PBX Code).
TIE Line Routing and Modification Table
This table is used when a PBX makes a call to another PBX, or passes a received call on to another
PBX. It contains leading numbers as well as routing instructions for each leading number; it controls
which calls are sent on which TIE lines.
Use this table to store the PBX codes of other PBXs on the network, the lines which can be used when
sending calls to each PBX, and, if necessary, a method to modify dialed numbers before sending them
down the TIE line.
When a PBX is about to send a number down a TIE line, it checks the number and finds the
preprogrammed leading digits (PBX code) of that number in this table. It then checks the highest-
priority (most preferred) CO line group assigned to that leading number. When it finds a line within the
highest-priority CO line group that is available, it modifies the number as programmed in this table. This
modification allows an identifying number or code to be attached to the beginning of calls made to
certain PBXs, so that the receiving PBX will be able to handle the call properly. After modification, the
number is sent down the line.
Incoming Number Modification Table
This table is referred to when a call is received on a TIE line.
When a PBX receives a call on a TIE line, it searches the Incoming Number Modification Table for
instructions on how to modify the received telephone number depending on which CO line the call was
received.
Next the PBX will look for its own PBX code at the beginning of the modified number and try to handle
the call by itself, by sending the call to one of its own extensions, for example. If it does not find its own
PBX code, it refers to the TIE line Routing and Modification Table in order to send the call down the TIE
line.
Own PBX Code
This information is used to determine whether or not an incoming TIE line call is meant for the PBX
receiving the call. If a PBX has been assigned a PBX code, it will look for its code at the beginning of
all calls received via TIE line. If it finds its own code, it will handle that call by itself. If it does not find its
code, it refers to the TIE Line Routing and Modification Table in order to pass the call to another PBX.
Note that PBX codes should not be assigned if the Extension Number Method (Access without PBX
Code) is the preferred method for handling calls on the private network. (
→
1.25.1.3 Extension Number
Method (Access without PBX Code))