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2. List of telephone switches - Wikipedia

   en.wikipedia.org/wiki/List_of_telephone_switches

   EMS-1 (The ITEC Electronic Modular Switch is an electronic direct control switching system. The modules are combined to form a complete switch or any of the modules can be added to your present Step-by-Step Systems.) EMS-2 (The EMS-2 RURAL SWITCH is a stored program control analog switch designed to be cost-effective in small exchanges.

3. Nortel Meridian - Wikipedia

   en.wikipedia.org/wiki/Nortel_Meridian

   Nortel Meridian is a private branch exchange telephone switching system. It provides advanced voice features, data connectivity, LAN communications, computer telephony integration (CTI), and information services for communication applications ranging from 60 to 80,000 lines.

4. Business telephone system - Wikipedia

   en.wikipedia.org/wiki/Business_telephone_system

   Key was a Bell System term of art for a customer-controlled switching system [1] such as the line buttons on the phones associated with such systems. The electrical components that allow for the selection of lines and features such as hold and intercom are housed in a panel or cabinet, called the key service unit or key system unit (KSU). [2]

5. IP PBX - Wikipedia

   en.wikipedia.org/wiki/IP_PBX

   3CX Phone System - was based on Windows operating system, but now has Windows and Linux versions. Asterisk - based on Linux operating system and has the largest market share. Most of the other IP PBXs were derived and customised on Asterisk as you will find a very long list. Bicom Systems; Dialexia; trixbox (formerly Asterisk@Home) FreeSWITCH

6. Public switched telephone network - Wikipedia

   en.wikipedia.org/wiki/Public_switched_telephone...

   Most automated telephone exchanges use digital switching rather than mechanical or analog switching. The trunks connecting the exchanges are also digital, called circuits or channels. However analog two-wire circuits are still used to connect the last mile from the exchange to the telephone in the home (also called the local loop).

7. Telephone switchboard - Wikipedia

   en.wikipedia.org/wiki/Telephone_switchboard

   PBX switchboard, 1975. A telephone switchboard is a device used to connect circuits of telephones to establish telephone calls between users or other switchboards. The switchboard is an essential component of a manual telephone exchange, and is operated by switchboard operators who use electrical cords or switches to establish the connections.