36 CFR Part 1194 - Information and Communication Technology (ICT) Final Standards and Guidelines (with amendments issued through Jan. 2018)
412.2 Volume Gain.
ICT that provides two-way voice communication shall conform to 412.2.1 or 412.2.2.
412.2.1 Volume Gain for Wireline Telephones.
Volume gain conforming to 47 CFR 68.317 shall be provided on analog and digital wireline telephones.
412.2.2 Volume Gain for Non-Wireline ICT.
A method for increasing volume shall be provided for non-wireline ICT.
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