Final answer:
The sound that signifies the end of communication between a monitoring station and an alarm panel is typically a beep or a tone.
Step-by-step explanation:
The sound that signifies the end of communication between a monitoring station and an alarm panel is typically a beep or a tone. This sound is often referred to as the 'disarm tone' or 'end of communication tone'. It is designed to alert the person monitoring the system that the communication has been successfully terminated.