IVR interacts with callers using prerecorded questions and answers. Auto-attendant features greet callers and provide an IVR menu.
Most IVR systems use Dual-Tone Multi-Frequency signaling (DTMF) to let callers use their keypads to choose pre-determined options.
Advanced IVR systems use speech recognition to provide human-like interactions through voice commands.
The menu guides the caller to select resolution or information gathering.