A sound heard by a telephone caller when the number dialled is being rung.
（电话拨通后听到的）振铃音
Example sentencesExamples
He stated that he had phoned on the Wednesday night and throughout the Thursday and that on all occasions the phone was either engaged or he just got a ringing tone.
As he leaned over the low brick walls, he punched in a now-familiar number and listened to the dull ringing tone.
Finally Craig's answer machine cut off the ringing tone.
The call-waiting facility interrupts the current call with a ringing tone to inform you there is another incoming call.
Dialing the numbers, she raised the phone to her ear and listened to the ringing tone.
In desperation I rang the local police at Hovingham where a woman answered and put me through to a police crime report section, but this too only responded with a ringing tone.
The callers will get to hear the set piece of music instead of the usual ringing tone.
I slammed down the receiver before I even heard the ringing tone, and all at once, I comprehended that I had made my choice.