RINGBACK SIGNAL

1. In telephony , a signal , usually consisting of an audio tone interrupted at a slow rate, provided to a caller to indicate that the called-party instrument is receiving a ringing signal. ( 188 ) Note: This signal may be generated by the called-party servicing switch or by the calling-party switch. 2. A ringing signal returned to a caller to indicate that one of the types of delayed automatic calling is now ringing the called party. ( 188 )