One for E.164 (instead of DNS mapping a la enum) ? Etc. etc.
I believe that it might also be possible to algorithmically place an E.164 into an NSAP and then into an IPv6 address using the special prefix that means an NSAP is in the low-order bits of the IPv6 address. It isn't clear to me whether this is explicitly documented at present.
RFC 4048 obsoleted that possibility.
Brian
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