diff --git a/library/MNCC_Types.ttcn b/library/MNCC_Types.ttcn
index bd233ce..e396892 100644
--- a/library/MNCC_Types.ttcn
+++ b/library/MNCC_Types.ttcn
@@ -472,7 +472,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -537,7 +537,7 @@
 			imsi := imsi,
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 };
@@ -604,7 +604,7 @@
 			imsi := imsi,
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 };
@@ -703,7 +703,7 @@
 			imsi := imsi,
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -735,7 +735,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -841,7 +841,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -908,7 +908,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -944,7 +944,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -1012,7 +1012,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -1046,7 +1046,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -1148,7 +1148,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -1181,7 +1181,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -1281,7 +1281,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -1316,7 +1316,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -1417,7 +1417,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -1450,7 +1450,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -1529,7 +1529,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -1625,7 +1625,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -1657,7 +1657,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -1729,7 +1729,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -1761,7 +1761,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -1826,7 +1826,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -1899,7 +1899,7 @@
 			imsi := "",
 			lchan_type := 0,
 			lchan_mode := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -1929,7 +1929,7 @@
 			rtp_port := 0,
 			payload_type := 0,
 			payload_msg_type := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }
@@ -1967,7 +1967,7 @@
 			rtp_port := rtp_port,
 			payload_type := pt,
 			payload_msg_type := 0,
-			sdp := ""
+			sdp := omit
 		}
 	}
 }