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  2. Vertical service code - Wikipedia

    en.wikipedia.org/wiki/Vertical_service_code

    Service definition Australia Japan UK Tone dialing Pulse dialing *51 1151 Who called me. Provides the directory number, date and time of unanswered calls. *52 1152 Call Hold (Single Line Variety Package). Permits the call to be picked up at another station. *53 1153 Distinctive Ring B. Allows a subscriber to alert a specific party distinctively ...

  3. Dialed Number Identification Service - Wikipedia

    en.wikipedia.org/wiki/Dialed_Number...

    Direct inward dial (DID) service also provides DNIS. For example, a company may have a different toll-free telephone number for each product line it sells, or for multilingual customer support . If a call center is handling calls for multiple product lines, the corporate telephone system that receives the call analyzes the DNIS signaling and ...

  4. Ringback number - Wikipedia

    en.wikipedia.org/wiki/Ringback_number

    In the 1970s and early 1980s, 1199011 was a number that when called would result in another dial tone. Afterwards, if the phone was hung up and then quickly picked up again in less than approximately 1/2 second (ie: a hook flash), a steady tone would then be heard (different from a regular dial tone). Hanging up the phone after this would ...

  5. Off-hook tone - Wikipedia

    en.wikipedia.org/wiki/Off-hook_tone

    "If you'd like to make a call, please hang up and try again. If you need help, hang up and then dial your operator. This is a recording."). A single burst of off-hook tone is sometimes used to indicate to a party that the call is being transferred, notably at 1-800-BELL-SOUTH (800-235-5768).

  6. On- and off-hook - Wikipedia

    en.wikipedia.org/wiki/On-_and_Off-hook

    On hook telephone handset. The term on-hook has the following meanings: . The condition that exists when a telephone or other user instrument is not in use, i.e., when idle waiting for a call.

  7. Engine order telegraph - Wikipedia

    en.wikipedia.org/wiki/Engine_order_telegraph

    In its original form, from the 19th century until about 1950, the device usually consisted of a round dial about 9 inches (230 mm) in diameter with a knob at the center attached to one or more handles, and an indicator pointer on the face of the dial. There would also be a revolutions per minute (RPM) indicator, worked by a hand crank. Modern ...

  8. List of international call prefixes - Wikipedia

    en.wikipedia.org/wiki/List_of_international_call...

    This is a list of international dialing prefixes used in various countries for direct dialing of international telephone calls.These prefixes are typically required only when dialling from a landline, while in GSM-compliant mobile phone (cell phone) systems, the symbol + before the country code may be used irrespective of where the telephone is used at that moment; the network operator ...

  9. Hayes AT command set - Wikipedia

    en.wikipedia.org/wiki/Hayes_AT_command_set

    The vast majority of dial-up modems use the Hayes command set in numerous variations. The command set covered only those operations supported by the earliest 300 bit/s modems. When new commands were required to control additional functionality in higher speed modems, a variety of one-off standards emerged from each of the major vendors.