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ENUM (RFC 2916) is the Internet Engineering Task Force (IETF) protocol that will assist in the convergence of the Public Switched Telephone Network (PSTN) and the IP network; it is the mapping of a telephone number from the PSTN to Internet services — telephone number in, URL out. ENUM was developed as a solution to the question of how to find services on the Internet using only a telephone number, and how telephones, which have an input mechanism limited to twelve keys on a keypad, can be used to access Internet services.

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