Panasonic KX-NS1000 Feature Manual page 271

a.
Extension Number Method (Access without PBX Code)
Dial the [Extension Number] only.
[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].
10.6.1 PBX Configuration—[2-6-1] System—Numbering Plan—Main—Features—
17.1 PBX Configuration—[9-1] Private Network—TIE Table—
Document Version 2016-03
PBX-2
TIE Line
Interface Interface
Extn. 2011
Dials "2011".
15.1.12 PRIVATE NETWORK FEATURES
PBX-3
TIE Line
Interface
Extn. 3011
Own PBX Code
TIE Line Access
Feature Manual 271