36 CFR Part 1194 - Proposed Information and Communication Technology (ICT) Standards and Guidelines NPRM
410.5 Digital Encoding of Speech.
ICT shall transmit and receive speech that is digitally encoded in the manner specified by ITU-T Recommendation G.722 (incorporated by reference in Chapter 1) for encoding and storing audio information.
EXCEPTION: Where ICT is a closed system, conformance to standards other than ITU-T Recommendation G.722 shall be permitted where equivalent or better acoustic performance is provided and where conversion to ITU-T Recommendation G.722 at the borders of the closed system is supported.
Advisory 410.5 Digital Encoding of Speech - Exception.One example of a closed system is a telephone network that enables calls to be placed between buildings and departments under the control of one entity, but is not used to receive or make outside calls.
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