66 ICX (International), issued March/1998 ICX-35-700Chapter 3. System Features Section 700 - Operation• 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 adestination 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 numbertenant group/ DL incoming trunk tenant group.Direct Line RingingDL Ringing allows calls on a specific trunk to be directed to ring a specific extension, System SpeedDial (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 canbe a more expensive use of the line since it has a more limited use.Hardware Requirements• N/AConsiderations• If the DDI/DL destination is a Directory Number (DN), the call goes to an extension that has adestination 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 numbertenant group/ DL incoming trunk tenant group.Direct Inward System Access RingingDISA Ringing (which is related to the DISA feature) allows a trunk specified as a DISA trunk to ringand give off-site users dial-in access to the System. Once the DISA trunk is accessed, the user receivesdial tone and may dial an extension.For more information on DISA, see “Direct Inward System Access” on page 38.Hardware Requirements• N/AConsiderations• N/AMultiple RingingDescriptionMultiple Ringing allows trunk calls into the System to be directed to ring multiple extensions in theSystem. This can be very useful when anyone in a group may answer a call. This can also be veryuseful at night when only a selected number of people are available to handle calls.Hardware Requirements• N/AConsiderations• N/A
