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Section 700 - Operation Chapter 3. System Features
ICX-50-700 ICX (International) issued October 2000 69
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 62.)
For more information on DDI trunk Trunk Interface, see “Trunk Interface - DDI (Not Available on
UK, TX or EX Model)” on page 67.
Hardware Requirements
•N/A
Considerations
• Caller ID takes priority over the DDI name assignment.
• Only one of the two DDI tables may have name assignments.
• If the DDI/DL destination is a Directory Number (DN), the call goes to an extension that has a
destination key even if the Primary Directory Number extension is busy or does not answer.
• If the DDI/DL destination is an UNA extension, the UNA will ring depending on DDI number
tenant group/ DL incoming trunk tenant group.
Direct Line Ringing
DL Ringing allows calls on a specific trunk to be directed to ring a specific extension, System Speed
Dial (SSD) number (for redirecting calls out), and hunting group.
This can be very useful when a trunk is dedicated to a specific person or purpose. However, this can
be a more expensive use of the line since it has a more limited use.
Prior to Version 4.0, it was impossible to distinguish between Private Line incoming calls and
Directory Number incoming calls. Version 4.0 and higher allows the person receiving the call to
easily distinguish between these types of incoming calls.
Hardware Requirements
•N/A
Considerations
• If the DDI/DL destination is a Directory Number (DN), the call goes to an extension that has a
destination key even if the Primary Directory Number extension is busy or does not answer.
• If the DDI/DL destination is an UNA extension, the UNA will ring depending on DDI number
tenant group/ DL incoming trunk tenant group.
Direct Inward System Access Ringing
DISA Ringing (which is related to the DISA feature) allows a trunk specified as a DISA trunk to ring
and give off-site users dial-in access to the System. Once the DISA trunk is accessed, the user receives
dial tone and may dial an extension.
For more information on DISA, see “Direct Inward System Access” on page 41.
Hardware Requirements
•N/A
Considerations
•N/A