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  2. Party line (telephony) - Wikipedia

    en.wikipedia.org/wiki/Party_line_(telephony)

    A party line (multiparty line, shared service line, party wire) is a local loop telephone circuit that is shared by multiple telephone service subscribers. [1] [2] [3]Party line systems were widely used to provide telephone service, starting with the first commercial switchboards in 1878. [4]

  3. Intercom - Wikipedia

    en.wikipedia.org/wiki/Intercom

    In the beginning, TV stations would simply build their own communication systems using old phone equipment. However, today there are several manufacturers offering off-the-shelf systems. From the late 1970s until the mid-90s, the two-wire party line-type systems were the most popular, primarily due to the technology that was available at the time.

  4. Party line - Wikipedia

    en.wikipedia.org/wiki/Party_line

    Party line or Party Line may refer to: Party line (politics) , the agenda of a political party Party line (telephony) , a system where multiple telephone customers are connected to the same phone line

  5. Telephone call - Wikipedia

    en.wikipedia.org/wiki/Telephone_call

    The call may use land line, mobile phone, satellite phone or any combination thereof. When a telephone call has more than one called party it is referred to as a conference call. When two or more users of the network are sharing the same physical line, it is called a party line or Rural phone line. U.S. President Gerald Ford on the phone

  6. Seven-digit dialing - Wikipedia

    en.wikipedia.org/wiki/Seven-digit_dialing

    A rural telephone number, often party line, had often up to four digits and a letter or letter and digits to indicate which of the multiple parties on the line was desired. Various methods were used to convert these to dialable numbers as dial systems replaced manual switchboards; many moderately-large cities used a 2L-4N format where "ADelaide ...

  7. Conference call - Wikipedia

    en.wikipedia.org/wiki/Conference_call

    The conference call may be designed to allow the called party to participate during the call or set up so that the called party merely listens into the call and cannot speak. 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.

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