Skip to content

RingCentral Cloud Phone SDK

The RingCentral Cloud Phone SDK helps developers connect to authorized live phone calls in a safe and secure way in order to access and/or manipulate a call's audio stream. In the world of artificial intelligence, this SDK is a critical tool in creating agents, extracting audio, injecting audio, generating transcripts, and more.

Get started with the Cloud Phone SDK

Supported Cloud Phone SDK features

  • Receive audio stream from peer
  • Stream local audio to remote peer
  • Receive inbound calls
  • Make outbound calls
  • Receive DTMF tones
  • Send DTMF tones
  • Reject inbound calls
  • Cancel outbound calls
  • Hangup active calls
  • Transfer calls

Evolution of the SDK

This SDK began its life as the now-retired RingCentral Softphone SDK for JavaScript, which was originally built on SIP over WebSocket (WSS) and used WebRTC for audio handling.

To improve reliability, scalability, and audio security, we re-architected the SDK from the ground up. The result was the RingCentral Softphone SDK for TypeScript, which adopted SIP over TLS and SRTP for encrypted audio transmission.

With the shift toward broader capabilities beyond a softphone, we've rebranded it as the RingCentral Cloud Phone SDK — a modern, extensible foundation for building real-time voice applications.