What is the difference between DID and DNIS?
DID (Direct Inward Dialing) is an incoming call service offered by your local carrier that allows every person or department to have a direct phone number. DID allows calling directly to the desired destination without the additional steps of an automated attendant or Primary Answering Position (formerly known as a receptionist) transfer. Most carriers off DID numbers in blocks of 100 with the last three or four digits matching the users extension number for continuity. Some companies order two DID numbers per person if faxmail is part of their messaging system (one DID for voice, one for faxmail. DID service comes standard or a very nominal cost with local T1 or PRI service. For smaller companies, traditional analog is available as in incoming service only. General business trunklines will still need to be installed to carry outside calls. Analog D.I.D. service is making a small comeback due to the Local Bell Operating Company (Verizon, here in the Northeast) dropping the price of ana
