Panasonic ICX Manual

Section 700 - Operation

Chapter 3. System Features

ICX-35-700

ICX (International), issued March/1998

 65

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The VB-44510 Loop Start interface unit supplies 8 loop start analog trunks circuits.

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Several types of trunk 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 allows calls on a common trunk 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 trunk 
and compared to a DDI Table that determines where the calls should ring. Depending on the 
assignments in the DDI Table, names or trunk 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 trunks handle the DDI calls, this 
can be more cost efficient than DL trunks 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 58.)

For more information on DDI trunk Trunk Interface, see “Trunk Interface - DDI (Not Available on 
UK, TX or EX Model)” on page 64.

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Caller ID takes priority over the DDI name assignment.