36 CFR Part 1194 - Information and Communication Technology (ICT) Final Standards and Guidelines (with amendments issued through Jan. 2018)
702.7.1 ITU-T Recommendation E.161, Series E.
Overall Network Operation, Telephone Service, Service Operation and Human Factors—International operation - Numbering plan of the international telephone service, Arrangement of digits, letters and symbols on telephones and other devices that can be used for gaining access to a telephone network, February 2001, IBR approved for Appendix C, Section 407.3.3.
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