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2. 10 Phone Systems for Small Businesses - AOL

   www.aol.com/10-phone-systems-small-businesses...

   Ready to upgrade your business communications? Start by comparing VoIP phone service providers.

3. Intercom - Wikipedia

   en.wikipedia.org/wiki/Intercom

   An intercom, also called an intercommunication device, intercommunicator, or interphone, is a stand-alone voice communications system for use within a building, small collection of buildings or portably within a small coverage area, which functions independently of the public telephone network. [1]

4. Business telephone system - Wikipedia

   en.wikipedia.org/wiki/Business_telephone_system

   A business telephone system differs from an installation of several telephones with multiple central office (CO) lines in that the CO lines used are directly controllable in key telephone systems from multiple telephone stations, and that such a system often provides additional features for call handling.

5. Wireless intercom - Wikipedia

   en.wikipedia.org/wiki/Wireless_intercom

   There are many types of wireless intercom systems on the market. Most wireless intercom systems communicate by radio waves using one of the frequencies allotted by various government agencies. Some wireless intercom systems communicate using the 802.11 standard. [1] There are also systems that advertise themselves as wireless, but communicate ...

6. 1A2 Key Telephone System - Wikipedia

   en.wikipedia.org/wiki/1A2_Key_Telephone_System

   The most commonly used telephone sets for the 1A2 systems were modifications of the Bell System standard 500-series telephones for rotary dial systems, and the 2500-series Touch-Tone desk sets. For key system operation these sets were equipped with a set of push-buttons ( keys ) and additional internal contact springs to control the additional ...

7. Extension (telephone) - Wikipedia

   en.wikipedia.org/wiki/Extension_(telephone)

   In business telephony, a telephone extension may refer to a phone on an internal telephone line attached to a private branch exchange (PBX) or Centrex system. The PBX operates much as a community switchboard does for a geographic telephone numbering plan and allows multiple lines inside the office to connect without each phone requiring a ...