What is "ringback"

n. (context telecommunications English) The sound transmitted back to a caller to indicate that the telephone they are calling is ringing.

Ringback may refer to:

• Ringback tone, the audible ringing that is heard by the calling party after dialing
• Ringback number, a number used by phone companies to test whether a telephone line and phone number is working
• Automatic ring back, a telephone feature to notify the caller when the called party ceases to be engaged