ringback

基本解释

A ringback tone is an audible indication that is heard on the telephone line by the caller while the phone they called is still in use.
隨著數字産品的普及，個性化的定制服務也在走曏每一個普通人。打電話時，我們聽到的不再是單調的“嘟嘟”聲，而是悅耳動聽的音樂。
This response is often sent all the way back to the client initiating the SIP transaction and might also be used by the user@ibm.com UAC to start a local ringback.
此響應通常會一直廻發到發起 SIP 事務的客戶機，還可能由 user@ibm.com UAC 用於啓動本地廻鈴 (Ringback)。
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.
“個性化接通廻音”）則是打電話時，傳統的電話提示音被音樂所取代，於是成爲了我們所說的“ 彩鈴”。
12530xiazai.com

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