diff --git a/library/CBSP_CodecPort.ttcn b/library/CBSP_CodecPort.ttcn
new file mode 100644
index 0000000..442b3e4
--- /dev/null
+++ b/library/CBSP_CodecPort.ttcn
@@ -0,0 +1,64 @@
+module CBSP_CodecPort {
+
+/* Simple CBSP Codec Port, translating between raw TCP octetstring payload
+ * towards the IPL4asp port provider, and CBSP primitives
+ * which carry the decoded CBSP data types as payload.
+ *
+ * (C) 2018 by Harald Welte <laforge@gnumonks.org>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ */
+
+
+import from IPL4asp_PortType all;
+import from IPL4asp_Types all;
+import from CBSP_Types all;
+
+type record CBSP_RecvFrom {
+	ConnectionId	connId,
+	CBSP_PDU	msg
+}
+
+type record CBSP_Send {
+	ConnectionId	connId,
+	CBSP_PDU	msg
+}
+
+template (value) CBSP_Send ts_CBSP_Send(ConnectionId conn_id, template (value) CBSP_PDU msg) := {
+	connId := conn_id,
+	msg := msg
+}
+
+template CBSP_RecvFrom tr_CBSP_Recv(template ConnectionId conn_id, template CBSP_PDU msg) := {
+	connId := conn_id,
+	msg := msg
+}
+
+private function IPL4_to_CBSP_RecvFrom(in ASP_RecvFrom pin, out CBSP_RecvFrom pout) {
+	pout.connId := pin.connId;
+	pout.msg := dec_CBSP_PDU(pin.msg);
+} with { extension "prototype(fast)" }
+
+private function CBSP_to_IPL4_Send(in CBSP_Send pin, out ASP_Send pout) {
+	pout.connId := pin.connId;
+	pout.proto := { tcp := {} };
+	pout.msg := enc_CBSP_PDU(pin.msg);
+} with { extension "prototype(fast)" }
+
+type port CBSP_CODEC_PT message {
+	out	CBSP_Send;
+	in	CBSP_RecvFrom,
+		ASP_ConnId_ReadyToRelease,
+		ASP_Event;
+} with { extension "user IPL4asp_PT
+	out(CBSP_Send -> ASP_Send: function(CBSP_to_IPL4_Send))
+	in(ASP_RecvFrom -> CBSP_RecvFrom: function(IPL4_to_CBSP_RecvFrom);
+	   ASP_ConnId_ReadyToRelease -> ASP_ConnId_ReadyToRelease: simple;
+	   ASP_Event -> ASP_Event: simple)"
+}
+
+
+
+}