Final answer:
The VRU obtains information by interacting with callers through automated voice prompts and gathering input through touch-tone keypad or speech recognition technology.
Step-by-step explanation:
The VRU (Voice Response Unit) obtains information by interacting with callers through automated voice prompts. It can gather information by asking callers to provide input using their touch-tone keypad or by using speech recognition technology to understand and interpret spoken responses.
The VRU then uses this information to guide callers to the appropriate resources or provide them with the requested information.