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Chapter 3. System Features
Centrex/PBX Compatibility
Description
Centrex/PBX Compatibility allows the System to be connected behind centrex or PBX lines.
When connected behind a PBX or Centrex,
Service
(TRS)
(Call Barring)
The System also supports transmission of a flash signal over the centrex or PBX link.
Hardware Requirements
•
N/A
Considerations
•
N/A
Class of Service
Description
A Class of Service (COS) allows or restricts access to a group of features or functions. For instance,
an Extension COS may allow Call Forwarding features. In the System, both extensions and exchange
lines use classes of service.
The System supports the following COSs for exchange lines and extensions:
•
COS - Exchange Line/Tie
•
COS - Ext/Ext Restriction
•
COS - Extension Feature
•
COS - Exchange Line to Exchange Line Restriction
Class of Service - Trunk/Tie
Tie/Trunk COS allows or restricts access to various features. Each trunk is assigned to one of 16
exchange line classes of service (00-15).
The following table shows the features that can be enabled/disabled for each exchange line COS.
Table 4.
Exchange Line COS
Number
1
Intercom Ringing Tone (Exchange Line or intercom ring tone)
2
Dial Tone to Tie Lines (Enable/Disable)
3
Forced Recover on Fast-Busy Tone (Send fast busy or disconnect line)
4
DDI Dialled Number Conversion Table (DDI/CLI Table A or B)
5
Paging on DISA/Tie-Line Call (Allow/Restrict)
6
DISA Security Code Verification
7
Network Flash Forwarding
8
Network Flash Receive
30
Automatic Route Selection (ARS) and
must
be used to restrict calls.
Feature
S-ICX (International) issued April 2002
Section 700 - Operation
Toll Restriction
S-ICX-64-700
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