Twilio for phone calls

Twilio Programmable Voice enables developers to build, scale, and automate global phone calls using a robust API.

Twilio handles the heavy lifting of global telecommunications through a single API (Voice API). You can initiate outbound calls, route inbound queries with Programmable Voice SDKs, and deploy interactive voice response (IVR) systems using simple TwiML instructions. The platform supports high-fidelity audio across 180+ countries and offers features like automated call recording, real-time transcription, and SIP trunking. Whether you are scaling a support center or building two-factor authentication (2FA) voice prompts, Twilio provides the infrastructure to manage millions of concurrent calls with 99.95% uptime.

https://www.twilio.com/en-us/voice