Panasonic KX-TDA100 Features Manual page 192

1.27 Networking Features
will either need to dial an extension number, or a PBX code in addition to an extension number,
depending on the method used to identify different PBXs on the private network. (See, "4. Identifying
PBXs and their Extensions", below.)
TIE Line with CO Line Calls
TIE line calls can be made to or from parties that are outside the private network. There are three ways
in which TIE lines can connect with CO lines. First, outside callers can call one PBX and then be
connected to an extension of another PBX (CO-to-TIE Line Calls). Secondly, an extension user at one
PBX can make a CO line call by using a CO line connected to another PBX in the private network (TIE-
to-CO Line Calls). Finally, an outside caller can call one PBX and then be connected to another outside
party after the call is first routed through another PBX (CO-to-TIE-to-CO Line Calls).
3.
Routing Calls via TIE Lines
Normally to make a telephone call, a person dials a number and the call is connected. What happens
between the dialing of the number and the ringing on the other end is usually never considered,
because telephone companies handle all the routing for us.
To make or receive calls using TIE lines however, the PBXs must be programmed so they will know
how to handle those calls as they are received and sent. In situations where only two PBXs connected
by one TIE line make up the private network, this programming is straightforward. In situations where
multiple PBXs are connected by several TIE lines however, programming is more complex.
No matter what kind of private network you use, careful programming will allow PBX users to make calls
easily and also route calls in a way that is most cost-effective or efficient for your company or
organization.
[Examples of Private Networks]
Example Network 1
Two PBXs connected by one TIE line.
PBX-1
Calls for PBX-2
192 Feature Guide
PBX-2
Calls for PBX-1