36 CFR Part 1194 - Proposed Information and Communication Technology (ICT) Standards and Guidelines NPRM
E102.7.2 ITU-T Recommendation E.161.
Arrangement of digits, letters and symbols on telephones and other devices that can be used for gaining access to a telephone network, ITU – T Study Group 2, (February 2001), IBR proposed for Section 407.3.2.
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