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  2. Plant test number - Wikipedia

    en.wikipedia.org/wiki/Plant_test_number

    Milliwatt test, a standardized 1004 Hz, zero dBm sinusoidal test tone used to measure line quality and transmission loss between stations. Ringback number, which causes the calling telephone to ring to verify an installation is working and the phone number routing properly. Some localities reserve only 958 or 959. [4] Each country uses ...

  3. Fax - Wikipedia

    en.wikipedia.org/wiki/Fax

    Utilizing a fax service provider does not require paper, a dedicated fax line, or consumable resources. [59] Another alternative to a physical fax machine is to make use of computer software which allows people to send and receive faxes using their own computers, utilizing fax servers and unified messaging. A virtual (email) fax can be printed ...

  4. 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 ...

  5. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    For example, 234 235-5678 is a valid telephone number; with area code 234, central office prefix (exchange) 235, and line number 5678. The number 234 911-5678 is invalid, because the central office code must not be in the form N11. 314 159-2653 is invalid, because the office code must not begin with 1.

  6. Loop around - Wikipedia

    en.wikipedia.org/wiki/Loop_around

    A loop line or loop around is a telephone company test circuit. The circuit has two associated phone numbers. When one side of the loop is called (side A), the caller receives a test tone of approximately 1000 Hz (milliwatt test). When the second number (side B) is called, it produces dead silence, but the party on side A hears the milliwatt ...

  7. Automatic number announcement circuit - Wikipedia

    en.wikipedia.org/wiki/Automatic_number...

    By connecting a test telephone set, a technician calls the local telephone number of the automatic number announcement service. This call is connected to equipment at the central office that uses automatic equipment to announce the telephone number of the line calling in. The main purpose of this system is to allow telephone company technicians ...

  8. T.38 - Wikipedia

    en.wikipedia.org/wiki/T.38

    This particular type of device is called Internet-Aware Fax device, or IAF, and it is capable of initiating or completing a fax call towards the IP network. The typical scenario where T.38 is used is – T.38 fax relay – where a T.30 fax device sends a fax over PSTN to a T.38 fax gateway which converts or encapsulates the T.30 protocol into a ...

  9. Called subscriber identification - Wikipedia

    en.wikipedia.org/wiki/Called_subscriber...

    A called subscriber identification (abbreviated CSID) is a string that identifies a specific fax machine as the recipient of a fax. [1] This string (typically less than 40 characters) is usually a combination of the fax machine's telephone number and identification of the fax machine's user.

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