Question: I'm looking for a tool that can create personalized greetings and IVR phone system messages with a professional-sounding voice.

If you want to build personalized greetings and IVR phone system messages with a human-sounding voice, Acoust is a great choice. It has more than 200 voices in 30+ languages, including ultra-realistic AI voices that you can control with parameters and emotions. The service also offers AI voice cloning, speech-to-text transcription and background music, and is good for other uses besides IVR systems.

Another service worth a look is PlayHT, which has more than 600 ultra-realistic AI voices, multiple languages and accents. It offers custom pronunciation, voice inflections, real-time voice cloning and an API for conversational chatbots and live streams. PlayHT can be used for video voiceovers, audio publishing and IVR systems.

Elto is also a good choice if you want a more advanced live conversation AI for automating phone calls. It's got lifelike voices, low latency and customizable call flows. The service can handle thousands of calls with minimal programming and has features like Human Handoff, IVR Auto-navigation and Post-Conversation Automation, so it's good for large-scale phone interactions.

If you want something that can handle a lot of different situations, AiVOOV offers more than 1000 AI voices in 150+ languages. It can handle a broad range of languages and accents, and offers features like multi-voice support, voice inflections and custom pronunciations. AiVOOV is good for global projects and can be integrated with other services, so it's a good option for building personalized greetings and IVR messages.