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  2. Ringer equivalence number - Wikipedia

    en.wikipedia.org/wiki/Ringer_equivalence_number

    The ringer equivalence number (REN) is a telecommunications measure that represents the electrical loading effect of a telephone ringer on a telephone line.In the United States, ringer equivalence was first defined by U.S. Code of Federal Regulations, Title 47, Part 68, based on the load that a standard Bell System model 500 telephone represented, and was later determined in accordance with ...

  3. Business telephone system - Wikipedia

    en.wikipedia.org/wiki/Business_telephone_system

    An IP PBX handles voice calls over the Internet Protocol (IP), bringing benefits for computer telephony integration (CTI). An IP-PBX can exist as physical hardware or can carry out its functions virtually, performing the call-routing activities of the traditional PBX or key system as a software system. The virtual version is also called a "Soft ...

  4. Google Voice - Wikipedia

    en.wikipedia.org/wiki/Google_Voice

    A Google Voice local phone number for incoming calls is currently available only for users in the United States. [13] Users may select a single U.S. phone number from various area codes, free of charge to each account. Incoming calls to the number may ring simultaneously any of the user's configured phones or the account's Google Talk feature ...

  5. AT&T Merlin - Wikipedia

    en.wikipedia.org/wiki/AT&T_Merlin

    A door phone controller (DAC-1Z) can be connected to your Merlin Plus system to allow employees to answer calls made from a business entrance. It is connected directly to a CO line port on the Merlin Plus control unit. Callers using the door phone can press a button at the building entrance to ring a telephone in your Merlin Plus system.

  6. VoIP phone - Wikipedia

    en.wikipedia.org/wiki/VoIP_phone

    A VoIP phone or IP phone uses voice over IP technologies for placing and transmitting telephone calls over an IP network, such as the Internet. [1] This is in contrast to a standard phone which uses the traditional public switched telephone network (PSTN). Digital IP-based telephone service uses control protocols such as the Session Initiation ...

  7. Voice over IP - Wikipedia

    en.wikipedia.org/wiki/Voice_over_IP

    Voice over Internet Protocol (VoIP), [a] also called IP telephony, is a method and group of technologies for voice calls for the delivery of voice communication sessions over Internet Protocol (IP) networks, [2] such as the Internet. The broader terms Internet telephony, broadband telephony, and broadband phone service specifically refer to the ...

  8. Ringing (telephony) - Wikipedia

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

    Ringing (telephony) Ringing is a telecommunication signal that causes a bell or other device to alert a telephone subscriber to an incoming telephone call. Historically, this entailed sending a high-voltage alternating current over the telephone line to a customer station which contained an electromagnetic bell.

  9. Ringtone - Wikipedia

    en.wikipedia.org/wiki/Ringtone

    Ringtone. Ringing noise from an electromechanical telephone. Example of a short digital tune which could be used as a ringtone on a mobile phone. A ringtone is the sound made by a telephone to indicate an incoming telephone call. Originally referring to the sound of electromechanical striking of bells or gongs, the term refers to any sound by ...