Can you imagine a phone book that would let you look up all the ways everyone can be contacted, online and off? That’s the eventual goal of the UK Enum directory. It will begin alittle less ambitiously, focusing on UK net telephone networks. Run by Nominet, Enum, also known asTelephone Number Mapping, was set up to “define a Domain Name System (DNS)-based architecture and protocols for mapping a telephone number to a Uniform Resource Identifier (URI) which can beused to contact a resource associated with that number,” according to a statement. To date there has been no directory of VoIP numbers, which could fuel a surge in Internet telephony. "It’s going to change the business model for communication providers quite seriously," Jay Daley, technology director at Nominet, told the BBC. A number of other countries areworking on similar directories, and eventually the directories are likely to include every way a person can be contacted – landline, VoIP, mobile, and e-mail.