Panasonic KX-TDA50 Feature Manual page 227

Explanation:
An outside caller dials "123-4567". The call reaches the destination (extension 1011 of PBX-1), and the
call is forwarded, transferred, or intercepted to extension "2011" of PBX-2 through the TIE line.
TIE-to-CO Line Access
The PBX sends TIE line calls to the CO lines of another PBX through the TIE lines.
a.
CO Line Call through Other PBXs
[Example]
<Extension Number Method (Access without PBX Code)>
PBX-1
Interface
Extn. 1011
Dials "802-9-211-4567".
Explanation:
1.
Extension 1011 of PBX-1 dials the Trunk Group Access number of PBX-1 "8", trunk group number
"02" (TRG2), Idle Line Access number of PBX-2 "9", and telephone number "211-4567".
4.8 [2-6-1] Numbering Plan—Main—Features—
2.
PBX-1 sends the call to PBX-2 through the trunk group (TRG) 2 (TIE line).
3.
PBX-2 sends the call to the outside party "211-4567".
Document Version 2010-11
CO Line
TIE Line Network
PBX-2
9-211-4567
TIE Line
Interface
TRG 2
Extn. 2011
13.1.13 PRIVATE NETWORK FEATURES
Telephone Company
CO Line
211-4567
Outside Party
(211-4567)
Trunk Group Access
Feature Manual 227