RestComm#329 Fix problem with decoding/encoding UserCause in DUPU pac…

…kets

m3ua/impl/src/main/java/org/restcomm/protocols/ss7/m3ua/impl/parameter/UserCauseImpl.java

@@ -40,15 +40,15 @@ public class UserCauseImpl extends ParameterImpl implements UserCause {
     protected UserCauseImpl(byte[] value) {
         this.tag = Parameter.User_Cause;
 
-        this.user = 0;
-        this.user |= value[0] & 0xFF;
-        this.user <<= 8;
-        this.user |= value[1] & 0xFF;
-
         this.cause = 0;
-        this.cause |= value[2] & 0xFF;
+        this.cause |= value[0] & 0xFF;
         this.cause <<= 8;
-        this.cause |= value[3] & 0xFF;
+        this.cause |= value[1] & 0xFF;
+
+        this.user = 0;
+        this.user |= value[2] & 0xFF;
+        this.user <<= 8;
+        this.user |= value[3] & 0xFF;
 
         this.value = value;
     }
@@ -65,11 +65,11 @@ private void encode() {
         // indicators;
         this.value = new byte[4];
         // encode routing context
-        value[0] = (byte) (this.user >> 8);
-        value[1] = (byte) (this.user);
+        value[0] = (byte) (this.cause >> 8);
+        value[1] = (byte) (this.cause);
 
-        value[2] = (byte) (this.cause >> 8);
-        value[3] = (byte) (this.cause);
+        value[2] = (byte) (this.user >> 8);
+        value[3] = (byte) (this.user);
 
     }