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2. Intercom - Wikipedia

   en.wikipedia.org/wiki/Intercom

   A butler uses an intercom on behalf of a lady. 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]

3. Wireless intercom - Wikipedia

   en.wikipedia.org/wiki/Wireless_intercom

   A wired intercom system may incorporate wireless elements. 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]

4. Business telephone system - Wikipedia

   en.wikipedia.org/wiki/Business_telephone_system

   The original intercom KTUs, WECo Model 207, were wired for a single talk link, that is, a single conversation on the intercom at a time. The WECo 6A dial intercom system provided two talk links and was often installed as the dial intercom in a 1A1 or 1A2 key system. The 6A systems were complex, troublesome, and expensive, and never became popular.

5. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   Wireless Mobile Telephony (WMT) PA Systems refers to PA paging and [intercom] systems that use any form of Wireless mobile telephony system such as GSM networks instead of a centralized amplifier to distribute the audio signal to paging locations across a building or campus, or other location. The GSM mobile Networks are used to provide the ...

6. Intercoms: A History of Distance - AOL

   www.aol.com/news/intercoms-history-distance...

   Companies like Vega and HME must be recognized among the developers of the early wireless intercom systems. Their idea was to take a partyline system—four or six beltpacks—and put them on ...

7. IP PBX - Wikipedia

   en.wikipedia.org/wiki/IP_PBX

   An IP PBX is a PBX system with IP connectivity and may provide additional audio, video, or instant messaging communication utilizing the TCP/IP protocol stack. Voice over IP (VoIP) gateways can be combined with traditional PBX functionality to allow businesses to use their managed intranet to help reduce long distance expenses and take ...

8. Talk:Business telephone system - Wikipedia

   en.wikipedia.org/wiki/Talk:Business_telephone_system

   EPABX (Electronic Private Automatic Branch Exchange) EPABX is an electronic device used in Offices, Hotels, Industries and many other places for voice communication. It is independent and can work with out any trunk lines (service providers) The main features offered by any EPABX system are: 1. Call transfer 2. Call pick up 3. Call back up 4.

9. Telephone exchange - Wikipedia

   en.wikipedia.org/wiki/Telephone_exchange

   The S12 system and E10 systems were merged into a single platform in the 1990s. The S12 system is used in Germany, Italy, Australia, Belgium, China, India, and many other countries around the world. Finally, when Alcatel and Lucent merged, the company acquired Lucent's 5ESS and 4ESS systems used throughout the United States of America and in ...