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Section 700 - Operation Chapter 3. System Features
576-13-700 DBS 576 (USA), Revised 6/11/98 29
When connected behind a PBX or Centrex, Toll Restriction Service (TRS) can be used to restrict
calls.
The System also supports transmission of a flash signal over the centrex or PBX link.
Hardware Requirements
•N/A
Related Programming
•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 trunks use
classes of service.
The System supports the following COSs for trunks and extensions:
• COS - Trunk/Tie
• COS - Ext/Ext Restriction
• COS - Extension Feature
• COS - Trunk to Trunk Restriction
Class of Service - Trunk/Tie
Tie/Trunk COS allows or restricts access to various features. Each trunk is assigned to one of 16 trunk
classes of service (00-15).
The following table shows the features that can be enabled/disabled for each trunk COS.
Table 4. Trunk COS
Hardware Requirements
•N/A
Number Feature
1 Intercom Ringing Tone (CO 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 DID/DDI Dialed Number Conversion Table (DID/DNIS Table A or B)
5 Paging on DISA/Tie-Line Call (Allow/Restrict)
6 DISA ID Verification