Direct Inward Dialing (DID)


Definition of DID (Direct Inward Dialing) in Network Encyclopedia.

What is Direct Inward Dialing (DID)?

Direct Inward Dialing, aka DID, is a service provided by a local exchange carrier (LEC) to a corporate client. Direct inward dialing (DID) uses a Private Branch Exchange (PBX) that allows outside callers to directly dial individuals within the company.

Direct Inward Dialing
Direct Inward Dialing



How Direct Inward Dialing works

The LEC allocates a block of phone numbers to the company, usually differing only in the last two, three, or four digits. For example, a company with 50 employees who each need a separate phone number could be assigned the numbers 555-1201 through 555-1250. Outside callers could dial the employees directly using these numbers, which are routed through perhaps only eight trunk lines that service the PBX, supporting a maximum of eight simultaneous calls. Inbound calls are routed by the PBX to the appropriate extension.




Editor

Articles posted after being checked by editors.

Recent Content

link to Named Pipe

Named Pipe

Named Pipe is an interprocess communication mechanism that provides reliable, connection-oriented, two-way communication between processes on two computers. Named pipes are one form of client/server...