Which is the first Generation of IVR
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Speech input and speech output
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Touch tone input and voice output
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Multi modal Modes of Input and Multimedia Output.
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Speech Input and Output and Visual Output.
The first generation of IVR systems relied on DTMF (touch-tone) signaling for input and pre-recorded audio for output. Users pressed numbers on their phone keypad to navigate menus. Speech recognition came later in subsequent generations.
The first generation of Interactive Voice Response (IVR) systems relied on touch-tone (DTMF) keypad input paired with pre-recorded voice prompts as output — callers pressed number keys to navigate menus and heard recorded voice responses. Later generations added speech recognition for input (2nd gen), and eventually multimodal input with multimedia output (3rd gen+). So "touch tone input and voice output" correctly describes the earliest IVR technology, not speech-based or multimodal interaction which came later.