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  2. Conference call - Wikipedia

    en.wikipedia.org/wiki/Conference_call

    The more limited three-way calling is available (usually at an extra charge) on home or office phone lines. For a three-way call, the first called party is dialed. Then the hook flash button (or recall button) is pressed and the other called party's phone number is dialed. While it is ringing, flash/recall is pressed again to connect the three ...

  3. Vertical service code - Wikipedia

    en.wikipedia.org/wiki/Vertical_service_code

    Last-call return (incoming) *69 HFC *10# [7] [8] 1361 1363 [9] 1471 [10] *70 1170 Call waiting disable *71 1171 Usage sensitive three-way call *72 1172 Unconditional forward: All calls *73 1173 Call forward: Cancel *74 1174 Speed calling (8 numbers) *75 1175 Speed calling (30 numbers) *77 1177 Anonymous call rejection activation *78 1178 Do not ...

  4. Telecommunications relay service - Wikipedia

    en.wikipedia.org/wiki/Telecommunications_relay...

    Once the most common type of TRS call, TTY calls involve a call from a deaf or hard-of-hearing person who utilizes a TTY to a hearing person. In this type of call, typed messages are relayed as voice messages by a TRS operator, [1] (also known as Communication Assistant (CA), [2] Relay Operator (RO), [3] Relay Assistant (RA), [4] or relay agent (agent)), and vice versa.

  5. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    *70 and 1170 — cancel call waiting on a call-by-call basis *71 and 1171 — three-way calling, which lets a person talk to people in two different locations at the same time *74 and 1174 — speed dial, which allows someone to quickly dial any of eight frequently called numbers using a one-digit code, from any phone on their line

  6. Local exchange carrier - Wikipedia

    en.wikipedia.org/wiki/Local_exchange_carrier

    Local Calling Guide Local calling, area code, and LATA information for Canada, the United States of America, and other countries which are part of the North American Numbering Plan. Using the Local Calling Guide Instructions (broken link 5/18/13) Using the Local Calling Guide and Google to do a phone company lookup by Zip Code instructions.

  7. Telephone exchange - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange

    For example, if a dial customer calling from TAylor 4725 dialed a number served by a manual exchange, e.g., ADams 1383-W, the call was completed, from the subscriber's perspective, exactly as a call to LEnnox 5813, in an automated exchange. The party line letters W, R, J, and M were only used in manual exchanges with jack-per-line party lines.

  8. Ringback number - Wikipedia

    en.wikipedia.org/wiki/Ringback_number

    The test consists of calling a reverting calling telephone number (ringback number) or a vertical service code with a standard telephone. Upon answering the call, the exchange plays a unique signal tone as a signal for the installer to hangup the telephone. The exchange then places a reverting call to the originating line, causing the telephone ...

  9. 10-10-321 - Wikipedia

    en.wikipedia.org/wiki/10-10-321

    10-10-321, 10-10-345, 10-10-220, and 10-10-987 are United States long-distance phone services best known for their prolific television and direct mail advertising in the late 1990s. 10-10-321 was the first mass-marketed service of its type. 10-10-345 was owned by AT&T, and the rest were all owned by MCI, which is now part of Verizon.