(Certificate of Public Convenience and Necessity) A document that registers a company as Carrier with public utility and corporation commissions.

Mobile Telephone Switching Office

A charge code that permits a specified non-recurring charge to be billed which is different from the tariff rate.

Emergency short cut dialing used to contact police departments for dispatch of officers, fire fighters or ambulances. The system identifies the caller’s location [..]

A feature that permits the calling party to dial a destination telephone number in fewer than normal digits. Speed dialing is an example.

A regulated charge billed to either end users or Carriers as compensation to the local telephone company for the origination and termination of line(s.)

A five- or seven-digit code that, when dialed, gives access to a desired network.

The portion of a leased telephone line between the end user's location and the Central Office. The circuit used to enter the telecommunications network.

The switching system that provides distribution for originating or terminating traffic between End Offices and the Interexchange Carrier’s Point-of-Termination. An Access [..]

(Advanced Digital Network Service) A digital private line service that transmits voice, data, video and other digital signals.