1.27 Networking Features
Feature Guide 209
3. PBX-1 checks its TIE Line Routing and Modification Table. Finds leading number "3". 1st priority
CO line group is "2".
4. No lines are available in this CO line group. The PBX checks for an available line in the 2nd priority
CO line group (CO line group 1), and finds an available line. No modification is programmed.
5. Sends the call down the TIE line via CO line group 1.
PBX-2 receives the call.
1. PBX-2 checks its Incoming Number Modification Table. No modification is programmed. The
number is still "3001".
2. PBX-2 checks its Extension Numbering Plan. "3001" is not one of its extensions.
3. PBX-2 checks its Other PBX Extension list, and finds an extension "3001".
4. PBX-2 checks its TIE Line Routing and Modification Table (not shown here). Finds leading number
"3". 1st priority CO line group is "8". No modification is programmed.
5. Sends the call down the TIE line via CO line group 8. The number is still "3001".
PBX-3 receives the call.
1. PBX-3 checks its Incoming Number Modification Table (not shown here). No modification is
programmed. The number is still "3001".
2. PBX-3 checks its Extension Numbering Plan. "3001" is one of its extensions.
3. PBX-3 sends the call to extension 3001.
3. TIE Line with CO Line Calls
Three types of CO line calls can be made or received via TIE lines:
1) CO-to-TIE Line Calls
2) TIE-to-CO Line Calls
3) CO-to-TIE-to-CO Line Calls
3.1. CO-to-TIE Line Calls
An extension of a PBX can be the destination of a CO line call received by another PBX first.
a) Incoming CO Line Call Destination Assignment
An extension of a PBX can be the Direct In Line (DIL) or Direct Inward Dialing (DID)
destination of a CO line call received first by another PBX.
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