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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Off-hook tone ： ウィキペディア英語版 Off-hook tone The off-hook tone (also receiver off-hook tone, off-hook warning, or howler tone) is a telephony signal used to alert a user that the telephone has been left off-hook without use for an extended period, effectively disabling the telephone line. See permanent signal. ==North America== In the North American Numbering Plan a quad-frequency tone is used, consisting of frequencies 1400 Hz, 2060 Hz, 2450 Hz, and 2600 hertz, at a cadence of 0.1s on, 0.1s off.〔(Telcordia GR-506 ) § 17.2.8 Receiver-Off-Hook (ROH) Tone〕 It is played between the dial-tone timeout recording ("If you would like to make a call...") and the permanent signal holding state. A single burst of off-hook tone is sometimes used to indicate to a party that their call is being transferred, notably at 1-800-BELL-SOUTH (800-235-5768). Some US CO switches, notably older GTE GTD-5s, utilize a single frequency tone, 480 Hz, known as "High Tone" for this purpose. In either case, the tone is substantially louder than any other signal which travels over a copper POTS circuit; loud enough to be heard across a room from an unused off-hook telephone. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Off-hook tone」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.