PROGRAMMABLE VOICE API

Build scalable, programmable voice communications

The Sinch Programmable Voice API helps businesses automate, personalize, and scale global voice calls for your apps, websites, and workflows with enterprise reliability and developer-friendly tools.

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Join over 150,000 businesses, including 8 of the 10 largest tech companies in the world

Smart & Scalable

Automate, personalize, and scale every voice interaction

Make your everyday communication tasks easy with programmable voice workflows and get human-like voices and enterprise-grade reliability through a single Voice API.

Increased efficiency

Automate routine calls, reminders, and updates so your team can focus on strategic work while programmable voice workflows run on their own.

Better experiences

Connect AI agents to deliver low-latency, natural-sounding voice conversations powered by text-to-speech in 115+ languages.

Global reliability

Count on an enterprise-grade Tier-1 network with phone numbers in 90+ countries to reach customers worldwide.
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API & Web/In-App Calling

Build fully custom voice flows with a single API

Create end-to-end voice experiences with programmable call flows, IVR logic, TTS, and in-app calling/video that works directly inside your web and mobile apps.

  • Enable in-app calling with WebRTC for web and mobile apps

  • Customize IVR menus and call flows

  • Generate natural speech in 115+ languages

  • Route and manage calls efficiently with built-in logic and event controls

  • Reach users globally with Sinch’s international coverage and local presence 

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FLEXIBLE FEATURES

Put complete control in developers’ hands

Build the voice functionality your business needs, from privacy protections to advanced analytics, using a versatile Voice API and SDKs.

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Enterprise-Grade Infrastructure

Grow globally on an enterprise-grade, always-on network

Take your business from local deployments to global operations on voice infrastructure designed for billions of interactions. Sinch Programmable Voice provides global coverage with strong local presence, regional redundancy, and carrier-grade routing so you can operate reliably at scale with a single global provider.

  • Phone numbers in 90+ countries

  • ISO 27001, GDPR, and STIR/SHAKEN compliance

  • High-volume, global calling from a single provider

WAYS TO USE IT

Control every call with developer-friendly APIs

Call Routing

Programmatically route calls using APIs and real-time events to control call flows.
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Number Masking

Keep customer information private by using temporary proxy numbers for calls.
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Text-to-Speech

Convert text into speech for automated calls and voice interactions.
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Interactive Voice Response (IVR)

Build sophisticated phone menus to automatically get customers to the right place.
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Outbound Alerts

Automatically trigger callout alerts as part of your voice workflows.
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Call Notifications

Deliver push notifications via APNs and FCM to display incoming call screens.
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Answering Machine Detection

Automatically detect whether a call is answered by a person or an answering machine.
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Call Recording

Securely record calls via BYO storage and transcribe them for analytics and compliance.
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Call Transcription

Turn voice calls into text – perfect for analysis and compliance.
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Conference Calling

Host multi-participant calls without the hassle of additional gear or carriers.
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Call Screening

Block spam, bring VIPs to the front, and automate call flows with over 99.95% availability across multiple AWS regions.
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Call Analytics

Track and optimize calls with real-time metrics and detailed reports, all in one dashboard.
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TOOLS FOR EVERY BUSINESS

Voice solutions for every step of the customer journey

Customer support & helpdesks

Build voice-enabled AI agents that handle routine interactions, route calls intelligently, and escalate seamlessly to human agents.

Notifications & alerts

Reach customers at the perfect time to keep them in the loop about fraud warnings, delivery updates, or appointment reminders.

In-app communications

Let users make and receive calls inside your web and mobile apps using SDKs powered by WebRTC, delivering branded, in-app voice experiences.

Protect customer privacy

Use proxy numbers so buyers and sellers or riders and drivers can connect without sharing personal phone numbers.

Frequently asked questions

Programmable voice refers to the ability to automate and control voice calls using APIs. Sinch’s Programmable Voice API allows businesses to embed voice functionality into their apps, websites, and workflows.

Pricing is pay-as-you-go, with per-minute charges for inbound and outbound calls. Additional fees apply for number rental and advanced features like recording, transcription, and IVR.

You need a Sinch account, API keys, a webhook-capable server, and at least one Sinch phone number. Developers familiar with REST APIs or SDKs can set it up quickly by using the Sinch dashboard.

Sinch is ISO 27001 certified, GDPR compliant, and supports STIR/SHAKEN in the US, helping businesses stay compliant at the regional and industry level.

Yes. Whether you’re just starting out or running worldwide operations, our flexible, usage-based model gives you the scalability and reliability you need.

Talk to an expert about programmable voice

Learn how to automate, personalize, and scale voice calls with Sinch’s developer-friendly API and SDKs.