| 释义 |
dual-tone multifrequency dual-tone multifrequency[′dü·əl ‚tōn ‚məl·tē′frē·kwən·sē] (communications) Signaling method employing set combinations of two specific frequencies used by subscribers and telephone private branch exchange attendants, if their switchboard positions are so equipped, to indicate telephone address digits, precedence ranks, and end of signaling. |