Editing Telephone number mapping (section)

==Rationale==
Being able to dial telephone numbers the way customers have come to expect is considered crucial for the convergence of classic telephone service ([[PSTN]]) and Internet telephony (Voice over IP, [[VoIP]]), and for the development of new [[Internet Protocol|IP]] multimedia services. The problem of a single universal personal identifier for multiple communication services can be solved with different approaches. One simple approach is the Electronic Number Mapping System (ENUM), developed by the [[IETF]], using existing E.164 telephone numbers, protocols and infrastructure to indirectly access different services available under a single personal identifier. ENUM also permits connecting the IP world to the telephone system in a seamless manner.