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The itu-t standard defining interchange circuits between dte and dce. V.24 is the itu-t equivalent of eia standard eia-232c.
V.24 recommends 12 modem carrier frequencies that will not interfere with dual tone multi-frequency 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