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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. Business telephone system - Wikipedia

   en.wikipedia.org/wiki/Business_telephone_system

   Virtual PBX systems or hosted PBX systems deliver PBX functionality as a service, available over the public switched telephone network (PSTN) or the Internet. Hosted PBXs are typically provided by a telephone company or service provider, using equipment located in the premises of a telephone exchange or the provider's data center. [14]

4. 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.

5. 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.

6. Telephone exchange names - Wikipedia

   en.wikipedia.org/wiki/Telephone_exchange_names

   A widely used numbering plan was a system of using one or two letters from the central office name with four or five digits. Such systems were designated as 2L-4N or 2L-5N, or simply 2–4 and 2–5, respectively, but some large cities initially selected plans with three letters (3L-4N). In 1917, W. G. Blauvelt of AT&T proposed a mapping system ...

7. 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