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| ringing tone | |||
| generic name | |||
| dial tone (A sound emitted by the receiver of a telephone that indicates that a number can be dialed) | |||
| dial tone; dial hum | |||
| on-hook signal | |||
| ringing signal; ringing tone signal | |||
| clear signal | |||
| dialing tone | |||
| call connected signal (TTY) | |||
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Freizeichen : 2 短语, 2 学科 |
| 技术 | 1 |
| 电子产品 | 1 |