Direct inward dialing (DID), also called direct dial-in (DDI) are telephone numbers offered by telephone companies for use with their customers.
In other words it is a telephone number.
Euphoria Telecom
Modified on: Wed, 29 Oct, 2014 at 3:52 PM
Direct inward dialing (DID), also called direct dial-in (DDI) are telephone numbers offered by telephone companies for use with their customers.
In other words it is a telephone number.
Euphoria Telecom
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