What is ENUM?
ENUM is the mapping of telephone numbers to domain names using Domain Name System (DNS) based architecture, in order to help facilitate such services as Voice over IP (VoIP). It allows network elements to find services on the Internet using only a telephone number. ENUM is simply the convergence of Public Switched Telephone Networks (PSTN) to Internet Protocol (IP) Networks. It is also the title of RFC 2916, the approved protocol document that discusses the use of DNS for the storage of E.164 numbers and the available services connected to an E.164 number. ENUM does not change the Numbering Plan and does not change telephony numbering or its administration in any way. ENUM will not drain already scarce numbering resources because it uses existing numbers.
