Section 700 - Operation
Chapter 3. System Features
S-ICX-64-700
S-ICX (International) issued April 2002
67
Hardware Requirements
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N/A
Considerations
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N/A
Trunk Interface - Loop Start
The VB-44510UK Loop Start interface unit supplies 8 loop start analog exchange line circuits. In
addition, the VB-44510UK Loop Start interface unit may alternatively be used to connect to loop start
exchange lines.
Hardware Requirements
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VB-44510UK Loop Start Card
Considerations
•
N/A
Trunk Ringing Types
Description
Several types of Exchange Line ringing are available for the System including the following:
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Direct Dial Inward (DDI) Ringing
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Direct Line (DL) Ringing
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Direct Inward System Access (DISA) Ringing
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Multiple Ringing
These ringing types may be used in any combination in the System.
DDI Ringing
DDI Ringing allows calls on a common Exchange Line to be directed to ring to a specific extension or
group of extensions, etc. based upon the final digits dialled. These final digits are received from the
DDI exchange line and compared to a DDI Table that determines where the calls should ring.
Depending on the assignments in the DDI Table, names or exchange line numbers are displayed.
(Names can be up to 10 digits long.)
DDI Ringing can be very useful by sending calls directly to a specific extension, hunt group, etc.
based upon the number dialled. Since a relatively small number of exchange lines handle the DDI
calls, this can be more cost efficient than DL exchange lines or attendant group answering and
transfer. (DDI may send a call to a group using the Virtual Extension feature.) DDI Busy/Delayed
Ringing is also available with DDI Ringing. (See “DDI (DID) Day/Night Busy/Delayed Ringing” on
page 59.)
For more information on DDI Exchange Line Exchange Line Interface, see “Trunk Interface - DDI
(Not Available on UK Model)” on page 66.
Hardware Requirements
•
N/A