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    @type origin: dns.name.Name object or None
    @rtype: dns.name.Name object
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Convert an ENUM domain name into an E.164 number.
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    @param origin: A domain containing the ENUM domain name.  The
    name is relativized to this domain before being converted to text.
    @type origin: dns.name.Name object or None
    @param want_plus_prefix: if True, add a '+' to the beginning of the
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