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The PSTN developed as a result of early telephony pioneers' efforts at building meshed and switched networks.
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SS7 is the switch-to-switch signaling network using to connect and bill calls placed across the PSTN.
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POTS, or plain old telephone service, is the basic single-line analog voice service from a phone company.
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Key systems and PBXs provide businesses a way of operating their own feature-rich voice networks at a lower cost than dealing only with PSTN-provided services.
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Lines and trunks are links between telephony devices. A line is a link from a switch to a phone. A trunk is a link from a switch to a switch.
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Voice over IP encompasses a large family of interface technologies, protocols, and standards that enable real-time media applications using IP networks.
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Traditional telephony isn't scalable like VoIP because it isn't software-driven like VoIP. Its ratio of calling capacity to network infrastructure is fixed, while VoIP's has lots of room for optimization.
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VoIP is suitable for deployment in homes and businesses, and, thanks to broadband and deregulation , is earning a reputation as a more practical way of delivering telephony services.