Panasonic KX-TDA100 Features Manual page 248

1.28 Networking Features
[Example]
b)
PBX Code Method (Access with PBX Code)
Dial the [TIE Line Access Number] + [PBX Code] + [Extension Number].
[Example]
248 Feature Guide
PBX-1
Interface
Extn.1011 Extn.1012
Dials "3011". Dials "2011".
Explanation:
To use this method, it is necessary to change the first one or two digits of extension
numbers of either PBX (e.g., 10XX for PBX-1, 20XX for PBX-2) to avoid having the
same extension number.
Case 1:
Extension 1012 of PBX-1 dials extension number "2011".
Extension 1012 of PBX-1 is connected to extension "2011" of PBX-2.
Case 2:
Extension 1011 of PBX-1 dials extension number "3011".
Extension 1011 of PBX-1 is connected to extension "3011" of PBX-3.
PBX-1
PBX Code 951
Interface
Extn.1011 Extn.1012
Dials "7-953-1011". Dials "7-952-1011".
[TIE line
access no.]
PBX-2
TIE Line
Interface Interface
Extn. 2011
PBX-2
PBX Code 952
TIE Line
Interface Interface
Extn. 1011
[PBX code]
[Extn. no.]
PBX-3
TIE Line
Interface
Extn. 3011
PBX-3
PBX Code 953
TIE Line
Interface
Extn. 1011