Twilio has added asynchronous call redirection to its REST API, allowing developers to control calls in real-time, put callers on hold, take them off hold, and even hang up on them with simple REST API requests.` `This feature opens up advanced use cases for call queuing, call centers, and enterprises, enabling developers to create customized call flows and experiences.` `With this new capability, developers can interrupt in-progress calls and redirect them to a new TwiML document of their choice, giving them real-time control over running calls.