What is the role of a headset in a sound powered telephone system?

In a sound powered telephone system, the primary role of a headset is to receive sound. This type of system is designed to operate without an external power source, relying instead on the user’s voice to generate sound through mechanical means. The headset consists of a receiver, which converts the electrical signal produced by the sound generated into audible sound waves for the user.

While the other functions listed relate to various components that could be part of communication systems, they do not specifically pertain to the headset's function in a sound powered telephone system. Enhancing audio recording is not relevant because this system focuses on communication rather than recording. Transmitting voice is a function typically associated with microphones or transmitters, not the receiver aspect of headphones. Decoding messages implies a processing capability that goes beyond the basic sound reception function of the headset in this specific application. Thus, the correct understanding is that the headset's role in this context specifically pertains to its function of receiving sound, facilitating communication through the system.