Which statement about call signals is true?

• A. They alert personnel to a call or message awaiting response.
• B. They require a separate battery.
• C. They carry voice signals directly.
• D. They are used to log maintenance events.

Answer: (A)

Call signals are notification tools in the sound-powered telephone system. Their job is to alert the crew that someone has called or a message is waiting, so the right person knows to respond. They provide a clear cue—audible or visual—without forming part of the actual voice transmission. Because the system relies on the operator’s voice to power the line, call signals don’t need a separate battery or power source, and they aren’t used to carry voice signals themselves. They also aren’t meant for logging maintenance events. In practice, when a distant station activates a call, the signal at the listener’s station draws attention so you can answer and continue the conversation through the sound-powered handset.