Panasonic KX-TDE100 Features Manual page 335

[Example]
PBX-1
Interface
Extn.1011 Extn.1012
Dials "3011".
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 allow calls to be routed properly.
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.
b)
PBX Code Method (Access with PBX Code)
Dial the [TIE Line Access Number] + [PBX Code] + [Extension Number].
→ 2.8.9 [2-6-1] Numbering Plan—Main—Features—TIE Line Access
→ 2.15.1 [9-1] TIE Table—Own PBX Code
[Example]
PBX-1
PBX Code 951
Extn.1011
Dials "7-953-1011".
PBX-2
TIE Line
Interface Interface
Extn. 2011
Dials "2011".
TIE Line
Interface
Extn.1012
Dials "7-952-1011".
[PBX code]
[TIE line
access no.]
[Extn. no.]
TIE Line
Interface
PBX-2
PBX Code 952
TIE Line
Interface Interface
Extn. 1011
1.30 Networking Features
PBX-3
Extn. 3011
PBX-3
PBX Code 953
Interface
Extn. 1011
Feature Guide 335