Section 700 - Operation Chapter 3. System Features576-20-700 DBS 576 (USA), issued January 1999 35a call to a group using the Virtual Extension feature.) DID Busy/Delayed Ringing is also availablewith DID Ringing. (See “DID Day/Night Busy/Delayed Ringing” on page 64.)For more information on DID CO Trunk Interface, see “CO Trunk Interface - DID” on page 36.Hardware Requirements• N/ARelated Programming• N/AConsiderations• Caller ID takes priority over the DID name assignment.• Only one of the two DID tables may have name assignments.• If the DID/DIL 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 DID/DIL destination is an UNA extension, the UNA will ring depending on DID numbertenant group/ DIL incoming CO tenant group.Direct In Line RingingDIL Ringing allows calls on a specific CO line to be directed to ring a specific extension, SystemSpeed 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 canbe a more expensive use of the line since it has a more limited use.Hardware Requirements• N/ARelated Programming• N/AConsiderations• If the DID/DIL 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 DID/DIL destination is an UNA extension, the UNA will ring depending on DID numbertenant group/ DIL incoming CO tenant group.Direct Inward System Access RingingDISA Ringing (which is related to the DISA feature) allows a CO trunk specified as a DISA CO trunkto ring and give off-site users dial-in access to the System. Once the DISA trunk is accessed, the userreceives dial tone and may dial an extension.For more information on DISA, see “Direct Inward System Access” on page 43.Hardware Requirements• N/ARelated Programming• N/A
