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const webrtc = document.querySelector('webrtc-client-ui');

// Notify backend that the next call is callbackcall
webrtc.makeAPICall('POST','/users/[ME]/features/callout/activate/',{
  "TargetNumber": "+123456789",
  "CallbackRequestId": "11111111-1111-1111-111111111111",
  "CallbackListId": "22222222-2222-2222-2222-222222222222"
});

// After 1 sec delay, place the actual call.
setTimeout(() => { webrtc.call('+123456789') },1000);