Dec 23, 2025
Thank You for an Incredible 2025
Zach Koch
Ben Lower
As 2025 winds down, we wanted to say, "thank you." Thank you for building with Ultravox, for pushing us to be better, and for being part of what has been, frankly, a mind-blowing year.
2025 by the Numbers
When we look back at where we started at the beginning of the year, the growth is hard to believe:
18x → How much larger our customer base is now than at the end of last year
38x → How much larger our busiest day was in 2025 vs. 2024
235 → The number of best-ever days on the platform in 2025
None of this happens without you. Every integration you've built, every voice agent you've deployed, every piece of feedback you've shared - it all adds up. You're not just using Ultravox, you're shaping it.
What's New
Before the holiday break, we wanted to get a few things into the hands of our users:
React Native SDK
Many of you asked for it, and it's here. Build native mobile voice experiences with Ultravox:
Source code and example app available in the repo.
Client SDK Improvement
Based on your feedback, we've made a change to how calls start: calls now begin immediately after you join them. No more waiting for end-user mic permission.
Why this matters: Inactivity messages now work as you'd expect. If an end user never starts speaking, the inactivity timeout can end the call automatically. This keeps those errant calls to a minimum and saves you money.
Call Transfers with SIP
Your agents can now transfer calls to human operators with built-in support:
coldTransfer— Immediately hand the call to a human operator. No context, instant handoff. Docs →warmTransfer— Hand off to a human operator with context about the call, so they're prepped and not going in cold. Docs →
Full guide: SIP Call Transfers →
Here's to What You'll Build Next & A BIG 2026
Voice AI is hitting an inflection point. The technology is finally good enough (fast enough, natural enough, affordable enough) to power experiences that weren't possible even a year ago.
Our 0.7 model release has been benchmarked against every major competitor (Gemini, OpenAI, Amazon Nova) and Ultravox leads in both speed and quality. When you factor in our $0.05/minute pricing, the choice becomes pretty obvious.
Thank you for being a customer. Thank you for believing in what we're building. And thank you for an unforgettable year. We have been hard at work on some new capabilities we can’t wait to get in your hands! Stay tuned for lots more to come in 2026!
Happy holidays from all of us at Ultravox.