What is the typical procedure to end a call on a sound-powered line?

• A. Return the handset to its cradle (or hang up) after the other party's message is completed and acknowledged.
• B. End the call by disconnecting the power supply.
• C. Remove the handset and leave it off the hook.
• D. Speak louder to indicate you are finished.

Answer: (A)

Ending a call on a sound-powered line is done by returning the handset to its cradle. This action triggers the hook switch to open the circuit, breaking the connection and signaling that the transmission is finished. Since sound-powered systems rely on the operator’s voice for power, there is no external power to disconnect, so the physical action of placing the handset back ends the call. Leaving the handset off the hook would keep the circuit active, and simply speaking louder does not terminate the line.