diff --git a/sysinfo/GSMTAP_Types.ttcn b/sysinfo/GSMTAP_Types.ttcn
index 9e7d980..3288284 100644
--- a/sysinfo/GSMTAP_Types.ttcn
+++ b/sysinfo/GSMTAP_Types.ttcn
@@ -3,6 +3,8 @@
 
 	const uint8_t GSMTAP_VERSION	:= 2;
 
+	const uint16_t GSMTAP_PORT	:= 4729;
+
 	type enumerated GsmtapMsgType {
 		GSMTAP_TYPE_UM (1),
 		GSMTAP_TYPE_ABIS (2),
diff --git a/sysinfo/Test.ttcn b/sysinfo/Test.ttcn
index b3506c0..c7ce0f9 100644
--- a/sysinfo/Test.ttcn
+++ b/sysinfo/Test.ttcn
@@ -1,5 +1,8 @@
 module Test {
 	import from GSM_SystemInformation all;
+	import from GSMTAP_Types all;
+	import from GSMTAP_PortType all;
+	import from IPL4_GSMTAP_CtrlFunct all;
 
 	const octetstring si1 := '5506198fb38000000000000000000000000000e504002b'O;
 	const octetstring si2 := '59061a00000000000000000000000000000000ffe50400'O;
@@ -7,6 +10,7 @@
 	const octetstring si4 := '31061c62f22404d25d40e504002b2b2b2b2b2b2b2b2b2b'O;
 
 	type component dummy_CT {
+		port GSMTAP_PT GSMTAP;
 	};
 
 	testcase TC_si1() runs on dummy_CT {
@@ -22,7 +26,55 @@
 		log("SI: ", dec_SystemInformation(si4));
 	}
 
+	template GsmtapHeader t_GsmtapHeader := {
+		version := GSMTAP_VERSION,
+		hdr_len := 4,
+		msg_type := ?,
+		timeslot := ?,
+		arfcn := ?,
+		signal_dbm := ?,
+		snr_db := ?,
+		frame_number := ?,
+		sub_type := ?,
+		antenna_nr := ?,
+		sub_slot := ?,
+		res := ?
+	}
+
+	template GsmtapHeader t_GsmtapHeaderUm(template GsmtapChannel ch) modifies t_GsmtapHeader := {
+		msg_type := GSMTAP_TYPE_UM,
+		sub_type := ch
+	}
+
+
+	template GsmtapMessage t_bcch := {
+		header := t_GsmtapHeaderUm(GSMTAP_CHANNEL_BCCH),
+		payload := ?
+	}
+
+	template GSMTAP_RecvFrom t_recvfrom(template GsmtapChannel ch) := {
+		connId := ?,
+		remName := ?,
+		remPort := ?,
+		locName := ?,
+		locPort := GSMTAP_PORT,
+		proto := {udp:={}},
+		userData := ?,
+		msg := { header := t_GsmtapHeaderUm(ch), payload := ?}
+	}
+
+	testcase TC_gsmtap() runs on dummy_CT {
+		map(self:GSMTAP, system:GSMTAP);
+		IPL4_GSMTAP_CtrlFunct.f_IPL4_listen(GSMTAP, "0.0.0.0", GSMTAP_PORT, {udp := {}});
+
+		var GSMTAP_RecvFrom rf;
+		GSMTAP.receive(t_recvfrom(GSMTAP_CHANNEL_BCCH)) -> value rf;
+		log("UDP Rx:", rf);
+		log("SI: ", dec_SystemInformation(rf.msg.payload));
+	}
+
 	control {
 		execute(TC_si1());
+		execute(TC_gsmtap());
 	}
 }