The Amazon Chime SDK is a service that makes it easy for developers to add real-time audio, video, and screen sharing capabilities to their applications. Starting today, the service connects to the global phone network so that attendees can dial into an Amazon Chime SDK meeting using a telephone. The feature also lets you programmatically place an outbound call to a phone number and connect the call to a meeting session. Previously, attendees were able to join Amazon Chime SDK meeting audio using voice over IP (VoIP) in mobile and web applications.
Source:: Amazon AWS