mgw: Introduce test TC_auep_null

Related: SYS#6481
Change-Id: I9395cd526cf626974fb0e2ed93ff5d95a433d8c0
diff --git a/library/MGCP_Templates.ttcn b/library/MGCP_Templates.ttcn
index e5a05bc..3a5f139 100644
--- a/library/MGCP_Templates.ttcn
+++ b/library/MGCP_Templates.ttcn
@@ -94,6 +94,22 @@
 		ver := "1.0"
 	};
 
+	template MgcpCommand ts_AUEP(MgcpTransId trans_id, charstring ep) := {
+		line := t_MgcpCmdLine("AUEP", trans_id, ep),
+		params := omit,
+		sdp := omit
+	}
+
+	template MgcpResponse tr_AUEP_ACK := {
+		line := {
+			code := "200",
+			trans_id := ?,
+			string := "OK"
+		},
+		params:= *,
+		sdp := omit
+	}
+
 	template MgcpCommand ts_CRCX(MgcpTransId trans_id, charstring ep, MgcpConnectionMode mode, MgcpCallId call_id, template SDP_Message sdp := omit) := {
 		line := t_MgcpCmdLine("CRCX", trans_id, ep),
 		params := {