Twilio Programmable Voice has introduced two new capabilities to enhance the user experience: support for blind transfer using SIP REFER messages and simultaneous or sequential dialing of multiple SIP endpoints. These features enable developers to use their existing applications with PSTN and Client access interchangeably with their SIP endpoints, free up resources in their IP communications infrastructure, and power their application with cloud capabilities through a SIP interface without costly equipment installations. With these new features, Twilio aims to enable even more use cases for its Programmable Voice service.