3-12 DBS 576 (USA) issued September 2001 576-50-700
Chapter 3. System Features Section 700 - Operation
Centrex/PBX Compatibility
Description
Centrex/PBX Compatibility allows the System to be connected behind centrex or PBX lines.
The System supports up to 6 access codes for dialing centrex or a PBX. These access codes allow the
System, System Message Detail Recording (SMDR) output to exclude the number dialed to reach a
centrex or PBX line.
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.
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