短语词组短语playing ringback 并回给主叫一个回铃音faultmans ringback 线务员回振铃功能ringback music 彩铃Ringback tone 回铃音ringback tones 回铃音ringback service 回振铃业务RBT RingBack Tone 回铃音ringback to life 使生动;使苏醒;使活Immediate Ringback Tone 即时回铃音 返回 ringback