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Home → Phone Systems → What is DID, and how does it work?
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DID = direct inward dialing. DID allows each employee to have their own phone number (not a main number followed by an extension, but a complete private phone number). DID is now generally offered only with a T1/PRI service. For example a PRI can have upto 23 voice channels, but you can have as many phone numbers ringing in on those 23 lines as you want. A company may have 200 employees, each with their own phone number. The way DID works is that the telco sends information regarding which number was called in a string of digits sent along with the call. The phone system must be capable of capturing these digits, and handle calls for that number in a predefined manner. For example, the phone system may send calls for 303-123-4567 to internal extension 145. Thus Joe Smith, who is a x-145, has a private number 303-123-4567. Even if Joe gets a second and a third call at the same time, as long as there's a line free, he'll get that call. Further enhancements to DID: 1- if the phone system has a flexible extension number plan, e.g. you can create extensions 4500-4600 (and perhaps map these to the phone system's internal extensions 100-199), then Joe Smith can have extension x-4567. Internal extension to extension calls, or calls hitting the auto attendant can dial 4567, and reach Joe Smith. Since these are the last four digits of his DID number, it makes it easy to reach Joe. 2- if Joe makes an outgoing call from his extension, the phone system can transmit information to the telco saying an extension belonging to 303-123-4567 is making the call. The telco can then transmit that number as the caller ID. So if the called party wants to call back the number they got a call from, they'll reach Joe Smith directly, instead of reaching the company's auto attendant. DID service is generally only available on T1/PRI service, it can only work on phone systems that can directly handle a T1/PRI circuit. Of the systems Neobits carries, Allworx, Zultys and Avaya are some examples of systems that have this capability. |
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December 17 2006, 06:08 PM |