The Sinch SDK is a product that makes adding voice calling or phone verification to web apps easy. It handles the complexity of signaling and audio management while providing you the freedom to create a stunning user interface. The current release supports web/phone (PSTN) calling as well as verification.

This document provides an overview for developers integrating with the Sinch SDK for the first time. It outlines the prerequisites and guides you through the process of verifying phone numbers in a Javascript environment, such as in a website.

Please see the Reference Documentation for a comprehensive description of all the classes.


Should you encounter any bugs, glitches, lack of functionality or other problems using our SDK, please send us an email to Your help in this regard is greatly appreciated.