Panasonic KX-TDA0484 Getting Started page 67

Step 7
Assign the leading number used to reach the extensions of the remote PBX:
In the Other PBX Extension Number (TIE) box (01 and 02), type 3 (for the Chicago office
extensions) and 6 (for the Chicago office fax extensions).
Step 8
Assign the routing information to route calls to the remote PBX:
In the Leading Number box, type 3 (for the Chicago office extensions), 6 (for the Chicago
office fax extensions), and 93 (for Chicago office PSTN access).
Note
Do not set any value in the Own PBX Code box.
After the above step, follow step 8 of the procedure in "5.1 Programming the PBX in the Los
Angeles Office".
B2 Programming for the Extension Number Method
Getting Started 67