diff --git a/openvidu-server/src/main/java/io/openvidu/server/cdr/CDREvent.java b/openvidu-server/src/main/java/io/openvidu/server/cdr/CDREvent.java
index 1361464d..b220b9a7 100644
--- a/openvidu-server/src/main/java/io/openvidu/server/cdr/CDREvent.java
+++ b/openvidu-server/src/main/java/io/openvidu/server/cdr/CDREvent.java
@@ -45,7 +45,9 @@ public class CDREvent {
 
 	public JsonObject toJson() {
 		JsonObject json = new JsonObject();
-		json.addProperty("sessionId", this.sessionId);
+		if (sessionId != null) {
+			json.addProperty("sessionId", this.sessionId);
+		}
 		json.addProperty("timestamp", this.timeStamp);
 		return json;
 	}
diff --git a/openvidu-server/src/main/java/io/openvidu/server/cdr/CDREventName.java b/openvidu-server/src/main/java/io/openvidu/server/cdr/CDREventName.java
index 17ea6ec4..0b54209d 100644
--- a/openvidu-server/src/main/java/io/openvidu/server/cdr/CDREventName.java
+++ b/openvidu-server/src/main/java/io/openvidu/server/cdr/CDREventName.java
@@ -19,6 +19,6 @@ package io.openvidu.server.cdr;
 
 public enum CDREventName {
 
-	sessionCreated, sessionDestroyed, participantJoined, participantLeft, webrtcConnectionCreated, webrtcConnectionDestroyed, recordingStarted, recordingStopped, recordingStatusChanged, filterEventDispatched
+	sessionCreated, sessionDestroyed, participantJoined, participantLeft, webrtcConnectionCreated, webrtcConnectionDestroyed, recordingStarted, recordingStopped, recordingStatusChanged, filterEventDispatched, mediaNodeAdded, mediaNodeRemoved
 
 }
diff --git a/openvidu-server/src/main/java/io/openvidu/server/cdr/CallDetailRecord.java b/openvidu-server/src/main/java/io/openvidu/server/cdr/CallDetailRecord.java
index c1c6f9fd..da95fa70 100644
--- a/openvidu-server/src/main/java/io/openvidu/server/cdr/CallDetailRecord.java
+++ b/openvidu-server/src/main/java/io/openvidu/server/cdr/CallDetailRecord.java
@@ -93,10 +93,10 @@ import io.openvidu.server.webhook.CDRLoggerWebhook;
 public class CallDetailRecord {
 
 	@Autowired
-	protected SessionManager sessionManager;
+	private SessionManager sessionManager;
 
 	@Autowired
-	protected OpenviduConfig openviduConfig;
+	private OpenviduConfig openviduConfig;
 
 	private Collection<CDRLogger> loggers;
 
@@ -226,7 +226,7 @@ public class CallDetailRecord {
 		this.log(new CDREventFilterEvent(sessionId, participantId, streamId, filterType, event));
 	}
 
-	private void log(CDREvent event) {
+	protected void log(CDREvent event) {
 		this.loggers.forEach(logger -> {
 
 			// TEMP FIX: AVOID SENDING recordingStarted AND recordingStopped EVENTS TO