u003cstrongu003eThe major components of the traditional landline phone systemsu003c/strongu003e are telephone lines, switching centers, fiber optic cables, cellular networks, satellites, and cable systems. u003cbr /u003eu003cbr /u003eThese are u003cstrongu003ebeing replaced by the modern VoIP phone systems where the components areu003c/strongu003e a signaling gateway controller, media gateway, media server, and application server. u003cbr /u003eu003cbr /u003eIn both, you do not have to worry about the backend processes as your service provider will take care of that for you. You will just be needed to maintain the front-end hardware and a preliminary understanding of how your device functions will suffice.