diff --git a/broker/src/main/java/cn/wildfirechat/push/PushMessage.java b/broker/src/main/java/cn/wildfirechat/push/PushMessage.java
index 75d21d64..497c8b73 100644
--- a/broker/src/main/java/cn/wildfirechat/push/PushMessage.java
+++ b/broker/src/main/java/cn/wildfirechat/push/PushMessage.java
@@ -43,7 +43,16 @@ public class PushMessage {
         this.cntType = messageContentType;
         this.serverTime = serverTime;
         this.unReceivedMsg = unReceivedMsg;
-        this.pushMessageType = (cntType == 400 ? PushServer.PushMessageType.PUSH_MESSAGE_TYPE_VOIP_INVITE : (cntType == 402 ? PushServer.PushMessageType.PUSH_MESSAGE_TYPE_VOIP_BYE : PushServer.PushMessageType.PUSH_MESSAGE_TYPE_NORMAL));
+        if (cntType == 400) {
+            this.pushMessageType = PushServer.PushMessageType.PUSH_MESSAGE_TYPE_VOIP_INVITE;
+        } else if(cntType == 402) {
+            this.pushMessageType = PushServer.PushMessageType.PUSH_MESSAGE_TYPE_VOIP_BYE;
+        } else if(cntType == 401) {
+            this.pushMessageType = PushServer.PushMessageType.PUSH_MESSAGE_TYPE_VOIP_ANSWER;
+        } else {
+            this.pushMessageType = PushServer.PushMessageType.PUSH_MESSAGE_TYPE_NORMAL;
+        }
+
         this.mentionedType = mentionedType;
         this.isHiddenDetail = isHiddenDetail;
         this.language = language;
diff --git a/broker/src/main/java/cn/wildfirechat/push/PushServer.java b/broker/src/main/java/cn/wildfirechat/push/PushServer.java
index 5beaf361..deb1f1ad 100644
--- a/broker/src/main/java/cn/wildfirechat/push/PushServer.java
+++ b/broker/src/main/java/cn/wildfirechat/push/PushServer.java
@@ -34,6 +34,7 @@ public class PushServer {
         int PUSH_MESSAGE_TYPE_VOIP_INVITE = 1;
         int PUSH_MESSAGE_TYPE_VOIP_BYE = 2;
         int PUSH_MESSAGE_TYPE_FRIEND_REQUEST = 3;
+        int PUSH_MESSAGE_TYPE_VOIP_ANSWER = 4;
     }
 
     private static PushServer INSTANCE = new PushServer();
diff --git a/broker/src/main/java/io/moquette/spi/impl/MessagesPublisher.java b/broker/src/main/java/io/moquette/spi/impl/MessagesPublisher.java
index a7efca08..9f72319c 100755
--- a/broker/src/main/java/io/moquette/spi/impl/MessagesPublisher.java
+++ b/broker/src/main/java/io/moquette/spi/impl/MessagesPublisher.java
@@ -332,7 +332,7 @@ public class MessagesPublisher {
                         }
                     }
 
-                    if ((StringUtil.isNullOrEmpty(pushContent) && messageContentType != 402 && messageContentType != 400)) {
+                    if ((StringUtil.isNullOrEmpty(pushContent) && messageContentType != 402 && messageContentType != 400 && messageContentType != 401)) {
                         LOG.info("push content is empty and contenttype is {}", messageContentType);
                         continue;
                     }