英 [ˈrɪŋbæk] 美 [ˈrɪŋbæk]
n. 二次呼叫；回弹
二次呼叫
... ringseal环封 ringback二次呼叫 ringdischarge环形放电 ...
(16) 回铃（Ringback）。回铃是由主叫客户机的应用指示一个被叫正在被振铃而产生的信号音。
Ringback(回铃音)：一个信号音，是给呼叫方的一个信号，表示被叫方正在振铃。
... ringup打电话给 ringback回电话 ringoff挂断电话，停止讲话 ...
二次呼叫；回弹
Ringback music, also called personalized ringback tone, is a piece of music heard by the caller instead of the traditional telephone ring signal when a telephone call is placed.
“个性化接通回音”则是打电话时，传统的电话提示音被音乐所取代，于是成为了我们所说的“彩铃”。
Apparently white people haven't yet mastered the art of making a ringback tone that sells, because the Caller Tunes chart is dominated by hip hop acts, with Lil Jon (aka Mr. Crunktastic) grabbing the top two spots.
ENGADGET: Lil Jon dominates T-Mobile Caller Tunes (aka ringback tones) chart