23 March 2006 10:15
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RFC 2806 : URLs for Telephone Calls - A. Vaha-Sipila, Nokia - April 2000
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"This document specifies URL (Uniform Resource Locator) schemes "tel", "fax" and "modem" for specifying the location of a terminal in the phone network and the connection types (modes of operation) that can be used to connect to that entity".
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