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Public Switched Telephone Service encompasses all forms of telecommunications that need to be switched from the calling device, to the receiving device. This includes analogue, Digital, cellular and VOIP, where part or all of the call transmission has to pass through a Public Switch. Only VOIP has the ability of circumventing the need to use a central exchange, but with the majority of telephone connections being NON-VOIP, it will be some time before VOIP supercedes normal telephony.

Please note that I have listed the technologies in the correct chronological sequence.

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12y ago

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