There are a large number of versions of this type of switch ranging from local, to transit to international gateway to mobile switching centres. This is a very widely deployed switching system found in Italy, Germany, Belgium, Australia and many other countries around the world. S12 - Formerly known as 'System 12' or the ITT 1240 or acquired by Alcatel when it purchased ITT's assets in Europe.Provides POTS/ISDN and next generation services. 1000 (MM) E10 - Evolved switch for multimedia / broadband and IP network environments.E10-MSC mobile switching centre for GSM and other protocols.E10-Five E10B adapted for the North American environment as a class-5 switch.E10-MT formerly Thomson MT-25 found mostly in France, and MT20 too.OCB-283 - Another name for more modern versions of E10B and often the name used in India to distinguish it from older versions.Common in France, Ireland, China, India and elsewhere. E10B (E10N1)- Major revision in the 1980s which eventually saw ISDN capabilities.E10A (E10N3)- Original switch introduced in 1972 one of the earliest deployments of TDM switching in the world.1000 E10 / S12 (during the 1990s the E10 and S12 systems were converged into a single product line).This lists Alcatel switches before the merger with Lucent Technologies. 76 Other experimental or canceled switches.72.4 Electronic switching systems / Stored program control.72 Western Electric / AT&T Technologies / Lucent.31 ITT Corporation (Includes ITT-Kellogg).16 Electronics and Telecommunications Research Institute (Korea).

Switch manufacturers list