DID stands for Direct Inward Dial (DID) number. A DID is a telephone number that can be dialed from outside of MIT, is routed to MIT's telephone network by other carriers on whose network the number may be dialed, and is then connected to an MIT telephone by MIT's voice network. MIT pays for a pool of direct inward dial numbers from outside telecommunications providers. DIDs are a limited resource and expensive, and are allocated/sold to local institutions in blocks of numbers.
- [archive:What does the error "No DIDs available" mean?]