If you want to create your own voice prompts for your phone system's IVR, PlayHT is a great choice. It has a library of more than 600 ultra-realistic AI voices, supports multiple languages and accents, and has options for custom pronunciation, voice inflection and real-time voice cloning. That makes it a good fit for IVR. It also offers API integration so you can easily plug it into your existing setup.
If you want a broader range of voices and languages, AiVOOV has more than 1000 AI voices in 150+ languages. Its interface is designed to accommodate multiple input formats and to produce output in MP3 and WAV. AiVOOV is designed for a variety of uses, including IVR, so it can be used as a voice prompt creation tool.