operator-trunk dialing

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• Trunk vs Toll — In the US, under the purview of the Bell System, local telephone calls were free except in a few big cities, and the term toll was adopted for long distance calls because they were subject to a toll.In the UK all calls were chargeable and the… …   Wikipedia

• Direct distance dialing — (DDD) or direct dial is a telecommunications term for a network provided service feature in which a call originator may, without operator assistance, call any other user outside the local calling area. DDD requires more digits in the number… …   Wikipedia

• Direct inward dialing — (DID), also called direct dial in (DDI) in Europe and Oceania, is a feature offered by telephone companies for use with their customers private branch exchange (PBX) systems. In DID service the telephone company provides one or more trunk lines… …   Wikipedia

• Subscriber trunk dialling — (STD, also known as subscriber toll dialling) is a term for the UK telephone system allowing subscribers to dial trunk calls without operator assistance. Terminology The term subscriber trunk dialling is used in other countries such as the… …   Wikipedia

• Direct Inward Dialing — (DID), also called Direct Dial In (DDI) in Europe, is a feature offered by telephone companies for use with their customers PBX systems, whereby the telephone company (telco) allocates a range of numbers all connected to their customer s PBX. As… …   Wikipedia

• Blue box (phreaking) — An early phreaking tool, the blue box is an electronic device that simulates a telephone operator s dialing console. It functions by replicating the tones used to switch long distance calls and using them to route the user s own call, bypassing… …   Wikipedia

• Telephone number — A telephone number or phone number is a sequence of digits used to call from one telephone line to another in a public switched telephone network. When telephone numbers were invented, they were short as few as one, two or three digits and were… …   Wikipedia

• Dual-tone multi-frequency signaling — One of the few production telephone DTMF keypads with all 16 keys, from an Autovon Telephone. The column of red keys produces the A, B, C, and D DTMF events. Dual tone multi frequency signaling (DTMF) is used for telecommunication signaling over… …   Wikipedia

• Communications in India — This article is about communications in India. For a more general coverage of media in India, see Media of India. The Republic of India possesses a diversified communications system that links all parts of the country by Internet, telephone,… …   Wikipedia

• Dual-tone multi-frequency — (DTMF) signaling is used for telephone signaling over the line in the voice frequency band to the call switching center. The version of DTMF used for telephone tone dialing is known by the trademarked term Touch Tone (canceled March 13, 1984),… …   Wikipedia

• Telephone numbering plan — Area Code redirects here. For the song by Ludacris, see Area Codes (song). A telephone numbering plan is a type of numbering scheme used in telecommunications to allocate telephone numbers to subscribers and to route telephone calls in a… …   Wikipedia