V.24 The defining interchange circuits between and . V.24 is the equivalent of standard . V.24 recommends 12 frequencies that will not interfere with or other telephone control tones. These are: GROUP A = 920 Hz, 1000 Hz, 1080 Hz, 1160 Hz GROUP B = 1320 Hz, 1400 Hz, 1480 Hz, 1560 Hz Group C = 1720 Hz, 1800 Hz, 1880 Hz, 1960 Hz (1995-03-02)
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