block8.js

// server/src/services/vonage/videoApi.js
...
const opentokSessionArgs = {
  mediaMode: 'routed',
};
...
const createSession = () => {
  return new Promise((resolve, reject) => {
    opentok.createSession(opentokSessionArgs, (err, session) => {
      if (err) {
        reject(err);
      } else {
        resolve(session);
      }
    });
  });
};