Panasonic KX-TDA100 Features Manual page 202

1.27 Networking Features
b)
TIE-to-CO Line Calls Routed by ARS
ARS can be used to route calls through other PBXs. This allows PBX users to dial telephone
numbers as they normally would (i.e., by dialing the Idle Line Access number "9" then the
telephone number) without having to think about which calls will be routed through another
PBX via TIE line, and which calls will be sent to a CO line connecting their PBX to the
telephone company.
[Example]
Explanation:
Extension 1001 dials the Idle Line Access number of PBX-1 "9", followed by the telephone
number "1-212-555-1234".
1.
2.
3.
c)
Blocking TIE-to-CO Line Calls
TIE-to-CO line calls can be prohibited based on the telephone number of the outside party that
the extension user is trying to make a call to, or can be blocked completely based on the CO
line group carrying the outgoing call.
When making TIE-to-CO line calls, the incoming TIE line call is received by one CO line of a
PBX, and the outgoing CO line call is made using another CO line. Both lines belong to CO
line groups, and both groups have a Class of Service (COS), therefore, Toll Restriction (TRS)
can be used to allow certain TIE-to-CO line calls to be made while others are prohibited. (→
1.8.1 Toll Restriction (TRS)) These restrictions are based on the COS of the CO line group
carrying the incoming TIE line call.
Additionally, the outgoing CO line group can be programmed to completely block all calls from
being made when incoming TIE line calls are received on CO line groups of a certain COS.
(External Call Block)
Note that it is possible for a PBX user to bypass these restrictions by using Direct Inward
System Access (DISA). By making a TIE line call to a floating extension number used by the
DISA feature of the other PBX, then using Walking COS (→ 1.8.4 Walking COS) or Verified
202 Feature Guide
PBX-1
Extn. 1001
Dials "9-12125551234"
The Idle Line Access number "9" was dialed, therefore PBX-1 modifies the dialed number
via its ARS programming (not shown here). It removes the Idle Line Access number, adds
the PBX code and Idle Line Access number of PBX-2 "902-9", and sends the number
down the TIE line to PBX-2. The number is now "902-9-12125551234".
PBX-2 checks its Incoming Number Modification Table (not shown here). No modification
is programmed. PBX-2 removes its PBX code (902). The number is now "9-
12125551234".
PBX-2 recognizes its Idle Line Access number, "9", and sends the remaining number,
"12125551234", to the telephone company using an idle CO line.
Private Network
PBX-2
CO Line
Telephone
Company
PBX Codes
PBX-1: 901
PBX-2: 902
Outside Party
1-212-555-1234