What term describes the set of channels that allows for on-demand communication?

The term that best describes the set of channels that allows for on-demand communication is radio trunking. This communication method utilizes a system that enables multiple users to share a number of frequencies efficiently. It optimizes the use of available channel space by automatically directing conversations to various channels as they are needed, allowing users to communicate quickly and effectively without the need for pre-assigned channels.

Radio trunking is ideal for environments where dynamic communication is necessary, such as emergency services, where responders need to coordinate efforts in real time. This system significantly improves communication efficiency compared to traditional methods, making it a preferred choice in many high-demand fields.

The other options, while they involve communication methods, do not encapsulate the on-demand characteristic of radio trunking. Satellite communication, for instance, is often used for long-distance or global communication but may not provide the same immediacy or channel-sharing capability. Wireless networking generally refers more broadly to connecting devices over a network rather than specifically handling on-demand voice communication. Telephone channels tend to be static and may not support the flexible and dynamic requirements of on-demand communication in the same way that radio trunking does.