Ultravox - Real-time function calling with Tools

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Join the Ultravox Discord community and explore advanced building options including inbound phone calls with Twilio and custom
agent tools. This email covers SDK options across five platforms (Flutter, JavaScript, Kotlin, Python, Swift) plus step-by-step
tutorials you can complete in under 30 minutes. Connect with other developers building cutting-edge voice AI applications and get
direct access to the Ultravox team.

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Hey Emre,
 
I hope your experience with Ultravox has been going smoothly so far. In this email, I've shared a couple of suggestions for things
you can build today in less than 30 minutes, as well as information on our various SDKs.
 
I would also like to invite you to join the Ultravox community on Discord [https://discord.com/invite/Qw6KHxv8YB]. This is a great
place to interact with members of the community who are building cutting-edge speech-to-speech AI applications, as well as connect
with members of the Ultravox team.

 
 
 


Extend your voice agent's capabilities with built-in and custom tools



Built-in Tools

Built-in tools provide common functionality right out of the box. These tools allow your agents to perform tasks like leaving a
voicemail, ending a call, or transferring the call to a human.
 
 
Quickstart: Built-in Tools → [https://docs.ultravox.ai/gettingstarted/quickstart/tools]

Custom Tools

Custom tools allow your agent to communicate with external systems and perform real-world actions. If you can do it with a
function, you can do it with a custom tool.
 
 
Quickstart: Custom Tools → [https://docs.ultravox.ai/gettingstarted/quickstart/tools#creating-a-custom-tool]

 

 
 
 




Client SDKs: Add voice AI to your web and mobile applications

 
The Ultravox SDK enables you to integrate voice AI agents into web and native apps. Each of the SDKs is open source and includes
an example application to help you get started fast.
 
Learn more → [https://docs.ultravox.ai/apps/sdks]
 



 

 



Please don't hesitate to contact us via email at support@ultravox.ai [support@ultravox.ai] if you have questions, need help, or
have suggestions on anything we can do to make Ultravox more useful for you! And don't forget, you can also connect with the
Ultravox user community on Discord [https://discord.com/invite/Qw6KHxv8YB].
 
Happy building!
 
Ben



https://x.com/FixieAI

https://github.com/fixie-ai

https://discord.com/invite/Qw6KHxv8YB

 
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Accession

nse/ultravox/2026-10-30/5589

From

Ben Lower · ben@ultravox.ai

Sent

30 October 2026 · 08:00 UTC