Self-service voice systems that automate inbound call handling through menu-driven navigation, caller identification, and routing — deflecting routine inquiries before they reach a live agent. Core capabilities include DTMF-based phone tree design, speech recognition (basic command), caller authentication and identification, queue management with estimated wait times, callback scheduling, dial-by-name directory, and integration with backend systems for self-service transactions (balance lookup, appointment confirmation). The category spans standalone IVR builders and IVR modules embedded within broader CCaaS platforms.