diff --git a/src/main/java/com/zdjizhi/flink/voip/functions/VoIPFusionFunction.java b/src/main/java/com/zdjizhi/flink/voip/functions/VoIPFusionFunction.java
index 19dc44e..a08f86b 100644
--- a/src/main/java/com/zdjizhi/flink/voip/functions/VoIPFusionFunction.java
+++ b/src/main/java/com/zdjizhi/flink/voip/functions/VoIPFusionFunction.java
@@ -83,6 +83,7 @@ public class VoIPFusionFunction extends KeyedCoProcessFunction<Tuple2<Integer, A
             rtpRecord.merge(sipObj)
                     .setString(Record.F_COMMON_SCHEMA_TYPE, SchemaType.VOIP.getValue());
             out.collect(rtpObj);
+            iterator.remove();
 
             switch (entry.getKey()) {
                 case S2C: