RFC 3966:The tel URI for Telephone Numbers
RFC-Ref

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Uniform Resource Identifier

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13. References
... Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform Resource Identifiers (URI): Generic Syntax", RFC 2396(-> 3986std66) ...
... Faltstrom, P. and M. Mealling, "The E.164 to Uniform Resource Identifiers (URI) Dynamic Delegation Discovery System (DDDS ...

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