... press the ID number, then the CALL button, enter the main CALL with the red lightB:No response signal ... signal, loud "drops" tones, prompted no signal, ends CALL state. Signal received, began to sound a beep tone: ... hear a "beep". Host can hang up on the call of the process. E:The indoor monitor is busy, ... standby. F:In the process of waiting for the off-hook, press CALL key again 1,If Indoor monitor ...