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| сигнализация на двух группах частот | |||
| двухтональный многочастотный набор (klabukov) | |||
| Английский тезаурус | |||
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| DTMF | |||
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| Dual Tone Multiple-Frequency (The signaling system used in telephones with touchtone keypads, in which each digit is associated with two specific frequencies) | |||
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Dual-Tone Multiple-Frequency : 1 фраза в 1 тематике |
| Телефония | 1 |