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PSTN
PSTN (Public Switched Telephone Network) is the network of the world's public circuit-switched telephone networks, in much the same way that the Internet is the network of the world's public IP-based packet-switched networks.

Originally a network of fixed-line analog telephone systems, the PSTN is now almost entirely digital, including mobile as well as fixed telephones. Many observers believe that the long term future of the PSTN is to be just one application of the Internet - however, the Internet has some way to go before this transition can be made. The quality of service guarantee is one aspect that needs to be improved in IP-based technologies such as Voice over IP (VoIP). Calls and text messages are switched using the signaling protocol SS7 between the telephone exchanges under an overall routing strategy.