{"slug": "rime-raises-24-million-to-put-its-ai-voice-on-enterprise-phone-lines", "title": "Rime Raises $24 Million to Put Its AI Voice on Enterprise Phone Lines", "summary": "Rime, a San Francisco startup building text-to-speech models for phone calls, raised $24 million in Series A funding led by M13. The company's AI voice now handles over 100 million phone conversations monthly for more than 20 enterprise customers, including Domino's and Wingstop. Rime focuses specifically on real-time phone call performance rather than general voice applications, betting that low latency and accuracy will drive adoption in customer service.", "body_md": "*Rime just closed a $24 million Series A. It's betting enterprises are finally ready to let an AI voice run a live customer phone call, not just staff a chatbot.*\n\nIf you've ordered a pizza from Domino's or grabbed wings from Wingstop by phone this year, there's a real chance the voice that took your order was synthetic.\n\nThat voice likely came from Rime, a San Francisco startup that builds text-to-speech models tuned for real phone calls rather than scripted demos. Rime raised $24 million in Series A funding led by M13. Twilio Ventures and Corazon Capital joined in, alongside existing backer Unusual Ventures, according to funding data compiled by PitchBook and Crunchbase. The company's speech models now carry more than 100 million phone conversations a month for more than 20 enterprise customers.\n\nIt's a fast follow up. Only fourteen months earlier, in May 2025, Rime raised a $5.5 million seed round that Axios reported was led by Unusual Ventures, alongside Founders You Should Know and Cadenza Capital.\n\nRime was founded in 2022 by Lily Clifford, who left a computational linguistics PhD program at Stanford to start the company. She was joined by Brooke Larson, a language engineer who came from Amazon's Alexa team, and Ares Geovanos, who had worked at UC San Francisco building brain-computer interfaces for patients who had lost the ability to speak. That background shows up in the product. A call center voice model has to survive bad phone lines, cross talk, and background noise, conditions no lab demo ever has to face. Geovanos and his co-founders have spent years thinking about what makes a voice recognizably human under pressure, not just intelligible in a quiet room.\n\n## The Latency Problem That Finally Broke\n\nTwo years ago, handing a live phone call to a model felt reckless to most brands. A wrong answer in a chat window can be edited before anyone notices it. A wrong answer on a phone call, spoken in a voice a customer already trusts, is a different kind of risk entirely. What changed isn't the caution. It's the latency. Cartesia's Sonic 4 model claims a time-to-first-audio near 40 milliseconds, fast enough that a caller can't tell they've hit a pause before the machine responds. Deepgram has bundled speech-to-text, the language model, and text-to-speech into a single voice agent API priced at $4.50 an hour. Close the gap to a few dozen milliseconds and the math for a call center changes, because the caller stops noticing they're talking to software at all.\n\n## A Narrower Bet Than the Market Leader\n\nRime is walking into a market with an obvious giant already in it. ElevenLabs has crossed $500 million in annualized revenue and now serves 41% of the Fortune 500, with enterprise work making up more than half its business. That's the company Rime gets measured against, and it hasn't tried to out market it. Rime's pitch is narrower. Build for the phone call specifically, not for every use case a voice model could serve, from audiobook narration to game characters to video dubbing. Depth over breadth, in a market where breadth already has a well funded leader.\n\nThat narrowness is also a bet on trust. A restaurant chain routing thousands of calls a day through Rime cares less about how expressive its voice sounds reciting a poem and more about whether it gets an order right when a customer mumbles through a bad connection. Domino's and Wingstop didn't sign up for a novelty act. They signed up because a botched order is cheap to notice and expensive to repeat, and Rime had to prove its error rate before either chain handed over its phone lines. Enterprise sales cycles for voice are slower than for text tools for exactly this reason. Nobody pilots a phone line quietly.\n\nNone of this guarantees Rime outlasts its better funded rivals. ElevenLabs and Deepgram both have the balance sheets to build call center specific products of their own, and Twilio, now one of Rime's own investors through Twilio Ventures, already runs the infrastructure that carries a huge share of business phone calls in the first place. That's either a hedge for Rime or a warning sign, depending on how Twilio chooses to compete. For now, the $24 million buys Rime time to widen its enterprise base before the giants turn their attention to the same phone lines Rime built for first.\n\n**Also read:** [Indian Coding Startup Emergent Becomes a Unicorn in Just Over a Year](https://startupfortune.com/indian-coding-startup-emergent-becomes-a-unicorn-in-just-over-a-year/) • [Kevin Ryan's AlleyCorp Raises $335 Million and Still Won't Chase Mega-Rounds](https://startupfortune.com/kevin-ryans-alleycorp-raises-335-million-and-still-wont-chase-mega-rounds/) • [Anthropic Gives Teachers Free Claude Access as AI Giants Fight for Classrooms](https://startupfortune.com/anthropic-gives-teachers-free-claude-access-as-ai-giants-fight-for-classrooms/)", "url": "https://wpnews.pro/news/rime-raises-24-million-to-put-its-ai-voice-on-enterprise-phone-lines", "canonical_source": "https://startupfortune.com/rime-raises-24-million-to-put-its-ai-voice-on-enterprise-phone-lines/", "published_at": "2026-07-15 13:17:23+00:00", "updated_at": "2026-07-15 13:26:22.012557+00:00", "lang": "en", "topics": ["artificial-intelligence", "ai-startups", "ai-products", "ai-tools", "natural-language-processing"], "entities": ["Rime", "M13", "Twilio Ventures", "Corazon Capital", "Unusual Ventures", "Domino's", "Wingstop", "ElevenLabs"], "alternates": {"html": "https://wpnews.pro/news/rime-raises-24-million-to-put-its-ai-voice-on-enterprise-phone-lines", "markdown": "https://wpnews.pro/news/rime-raises-24-million-to-put-its-ai-voice-on-enterprise-phone-lines.md", "text": "https://wpnews.pro/news/rime-raises-24-million-to-put-its-ai-voice-on-enterprise-phone-lines.txt", "jsonld": "https://wpnews.pro/news/rime-raises-24-million-to-put-its-ai-voice-on-enterprise-phone-lines.jsonld"}}