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Update: seems like it just took a little while to take effect... error stopped occurring with no changes to the code.

I guess that you just add the missing permission and test it. If that is the case, wait for a few minutes for the system to apply the changes, then try again.

By the way, here is a new code to get new call recording notifications. I will update the tutorial later though.

function presenceEvent(msg){
  var user = {
    extensionId: msg.body.extensionId,
    sessionId: msg.body.activeCalls[0].sessionId,
    telephonyStatus: msg.body.telephonyStatus
  }
  checkTelephonyStatusChange(user)
}

function checkTelephonyStatusChange(user){
  var newUser = true
  for (var i=0; i<usersList.length; i++){
    if (usersList[i].extensionId == user.extensionId){
      console.log("OLD -> NEW: " + usersList[i].telephonyStatus + " -> " + user.telephonyStatus)
      newUser = false
      if (usersList[i].telephonyStatus == "NoCall" && user.telephonyStatus == "Ringing"){
        usersList[i].telephonyStatus = user.telephonyStatus
        console.log("ExtensionId " + usersList[i].extensionId + " has an incoming call")
        break
      }
      if (usersList[i].telephonyStatus == "Ringing" && user.telephonyStatus == "CallConnected"){
        usersList[i].telephonyStatus = user.telephonyStatus
        console.log("ExtensionId " + usersList[i].extensionId + " has a accepted a call")
        break
      }
      if (usersList[i].telephonyStatus == "Ringing" && user.telephonyStatus == "NoCall"){
        usersList[i].telephonyStatus = user.telephonyStatus
        console.log("ExtensionId " + usersList[i].extensionId + " has a missed call")
        break
      }
      if (usersList[i].telephonyStatus == "CallConnected" && user.telephonyStatus == "NoCall"){
        usersList[i].telephonyStatus = user.telephonyStatus
        console.log("ExtensionId " + usersList[i].extensionId + " has a terminated call")
        // wait for about 20 secs then check for call recordings
        var thisUser = usersList[i]
        setTimeout(function(){
          readExtensionCallLogs(thisUser)
        }, 20000)
        break
      }
    }
  }
  if (newUser){
    console.log("NEW USER: " + " -> " + user.telephonyStatus)
    if (user.telephonyStatus == "Ringing"){
      console.log("ExtensionId " + user.extensionId + " has an incoming call")
    }
    usersList.push(user)
  }
}

function readExtensionCallLogs(user){
  var endpoint = '/account/~/extension/'+ user.extensionId +'/call-log'
  var params = {}
  params['sessionId'] = user.sessionId
  platform.get(endpoint, params)
  .then(function(resp){
    async.each(resp.json().records,
      function(record, callback){
        if (record.hasOwnProperty("recording")){
          console.log("THIS CALL HAS A RECORDING: " + record.recording.contentUri)
          saveAudioFile(record)
          callback(null, "done")
        }
      },
      function(err){
        console.log("No call with call recording within this period of time.")
      }
    );
  })
  .catch(function(e){
    var err = e.toString();
    console.log(err)
  })
}