What Is a WAN (Wide Area Network)?

A WAN is a geographically dispersed telecommunications network and the term distinguishes a broader telecommunications structure from a local area network (LAN). A wide area network may be privately owned or rented, but the term usually connotes the inclusion of public (shared user) networks. An intermediate form of network in terms of geography is a metropolitan area network (MAN).

Should have info here on phone systems on wan's ??