Panasonic KX-TDA50 Feature Manual page 214

1.13 P
2.
Making a TIE Line Call
One of the following two methods can be used to make a TIE line call.
a)
Extension Number Method (Access without PBX Code)
Dial the [Extension Number] only.
[Example]
Extn.1011
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.
214 Feature Manual
PBX-1
TIE Line
Interface Interface Interface
Extn.1012
Extn. 2011
Dials "2011".
PBX-2
TIE Line
Interface
PBX-3
Extn. 3011