Abstract: Hold/off Alert System helps minimize the loss of time when people are put on hold. The invention can alert callers audibly when they are released from a hold state. The said system and its function are integrated to the existing phones, requiring some modifications to both calling phones and called phones. Its working components include, but not limited to, a tone detector circuit, the HAS button, the speech network, the buzzer, its driver, the MPU, and the HAS lamp for the calling phone; and the hold button, the hold-release button, the CPU, and the DTMF dialer for the called phone. The pressing of the hold or the hold-release buttons generates DTMF tone signals in the called phone which are transmitted to the calling phone to trigger a sound alert.