23 March 2006 11:15
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RFC 4355 : IANA Registration for Enumservices email, fax, mms, ems, and sms - [...] - January 2006
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"This document registers the Enumservices "email", "fax", "sms", "ems", and "mms" using the URI schemes 'tel:' and 'mailto:' as per the IANA registration process defined in the ENUM specification RFC 3761".
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