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Chapter 3. System Features
49
OHVA Answer (Allow/Deny)
50
Call-Waiting Answer at HOLD
Hardware Requirements
•
N/A
Related Programming
•
FF2: Trunk COS
•
FF3: Extension COS Assignments
Considerations
•
N/A
Class of Service - Trunk to Trunk Restriction
Trunk to Trunk COS allows or restricts call transfers from one trunk to another trunk based on the
originating and receiving trunk COS.
Hardware Requirements
•
N/A
Related Programming
•
FF1-0-04: Class of Service Trunk/Tie
•
FF1-0-11: Trunk-Trunk Restriction
Considerations
•
N/A
CO Ringing Types
Description
Several types of CO ringing are available for the System including the following:
•
Direct Inward Dialing (DID) Ringing
•
Direct In Line (DIL) Ringing
•
Direct Inward System Access (DISA) Ringing
•
Multiple Ringing
These ringing types may be used in any combination in the System.
Direct Inward Dial Ringing
DID Ringing allows calls on a common CO to be directed to ring to a specific extension or group of
extensions, etc. based upon the final digits dialed. These final digits are received from the DID trunk
and compared to a DID Table that determines where the calls should ring. Depending on the
32
Class of Service Features
DBS 576 (USA), Revised 6/11/98
Section 700 - Operation
576-13-700
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