A telephone annunciator is disclosed which includes a voice ROM with a prerecorded message which is played back in response to a call received from an unwanted caller. A line current modulator is coupled with the voice ROM and the telephone line. A DTMF tone decoder circuit is coupled with the telephone line for decoding at least one DTMF code signal for producing a trigger signal. An on/off control circuit is responsive to the trigger signal for turning on the voice ROM whereby the telephone line current is modulated by the modulator in accordance with the audio signal from the voice ROM. A start-up power supply includes a storage capacitor and stores a charge in response to a ring signal on the telephone line. A main power supply is connected with the telephone line to receive power therefrom when an off-hook signal is detected.