diff --git a/include/libtcap.h b/include/libtcap.h
index 93760e8..2ed1b36 100644
--- a/include/libtcap.h
+++ b/include/libtcap.h
@@ -1,6 +1,8 @@
 #ifndef _LIBTCAP_H_
 #define _LIBTCAP_H_
 
+#include <stddef.h>
+#include <stdint.h>
 
 #include "TCMessage.h"
 #include "Invoke.h"
@@ -19,6 +21,7 @@ static inline void output_buffer_init(struct output_buffer *o, char *i, size_t s
 	o->used = 0;
 }
 
+int tcap_encode_with_routing(char **out, const uint8_t *routing, size_t routing_len);
 
 
 TCMessage_t *tcap_decode(const char *buf, size_t len);
diff --git a/src/tcap.c b/src/tcap.c
index f9b9b26..67c9d2b 100644
--- a/src/tcap.c
+++ b/src/tcap.c
@@ -9,14 +9,15 @@
 #include "asn_SEQUENCE_OF.h"
 #include "constr_CHOICE.h"
 
-#include "TCMessage.h"
-#include "Invoke.h"
-#include "InitialDPArg.h"
+#include "CalledPartyNumber.h"
+#include "Component.h"
+#include "ComponentPortion.h"
 #include "ConnectArg.h"
 #include "FurnishChargingInformationArg.h"
 #include "INTEGER.h"
-#include "ComponentPortion.h"
-#include "Component.h"
+#include "InitialDPArg.h"
+#include "Invoke.h"
+#include "TCMessage.h"
 
 
 
@@ -70,6 +71,53 @@ int tcap_encode(char **out, TCMessage_t *msg) {
 	return len;
 }
 
+int tcap_encode_with_routing(char **out, const uint8_t *routing, size_t routing_len) {
+	int ret;
+	TCMessage_t msg;
+	ComponentPortion_t cp;
+	Component_t *cmp_arr;
+	Component_t cmp;
+	ConnectArg_t ca;
+	CalledPartyNumber_t *cpn_arr;
+	CalledPartyNumber_t cpn;
+
+	// init first
+	memset(&msg, 0, sizeof(msg));
+	memset(&cp, 0, sizeof(cp));
+	memset(&cmp, 0, sizeof(cmp));
+	memset(&ca, 0, sizeof(ca));
+	memset(&cpn, 0, sizeof(cpn));
+
+	cpn.buf = (uint8_t *)routing;
+	cpn.size = routing_len;
+
+	// fill structs
+	msg.present = TCMessage_PR_begin;
+	msg.choice.begin.components = &cp;
+
+	cmp_arr = &cmp;
+	cp.list.count = 1;
+	cp.list.array = &cmp_arr;
+
+	cmp.present = Component_PR_invoke;
+	cmp.choice.invoke.opCode.present = OPERATION_PR_localValue;
+	asn_long2INTEGER(&cmp.choice.invoke.opCode.choice.localValue, 20); // connect
+
+	cpn_arr = &cpn;
+	ca.destinationRoutingAddress.list.count = 1;
+	ca.destinationRoutingAddress.list.array = &cpn_arr;
+
+	cmp.choice.invoke.parameter = ANY_new_fromType(&asn_DEF_ConnectArg, &ca);
+
+	ret = tcap_encode(out, &msg);
+
+	asn_DEF_ANY.free_struct(&asn_DEF_ANY, cmp.choice.invoke.parameter, 0);
+	//asn_DEF_INTEGER.free_struct(&asn_DEF_INTEGER, &cmp.choice.invoke.opCode.choice.localValue, 0);
+	free(cmp.choice.invoke.opCode.choice.localValue.buf);
+
+	return ret;
+}
+
 TCMessage_t *tcap_decode(const char *buf, size_t len) {
 	TCMessage_t *ret = NULL;
 	asn_dec_rval_t rv;
diff --git a/tests/encode.c b/tests/encode.c
index 1e33651..fa4928f 100644
--- a/tests/encode.c
+++ b/tests/encode.c
@@ -11,50 +11,17 @@
 int main() {
 	char *buf;
 	int ret;
-	TCMessage_t msg;
-	ComponentPortion_t cp;
-	Component_t *cmp_arr;
-	Component_t cmp;
-	ConnectArg_t ca;
-	CalledPartyNumber_t *cpn_arr;
-	CalledPartyNumber_t cpn;
+	const uint8_t number[] = "1234567890";
 
-	memset(&msg, 0, sizeof(msg));
-	memset(&cp, 0, sizeof(cp));
-	memset(&cmp, 0, sizeof(cmp));
-	memset(&ca, 0, sizeof(ca));
-	memset(&cpn, 0, sizeof(cpn));
-
-	msg.present = TCMessage_PR_begin;
-	msg.choice.begin.components = &cp;
-
-	cp.list.count = 1;
-	cmp_arr = &cmp;
-	cp.list.array = &cmp_arr;
-
-	cmp.present = Component_PR_invoke;
-	cmp.choice.invoke.opCode.present = OPERATION_PR_localValue;
-	asn_long2INTEGER(&cmp.choice.invoke.opCode.choice.localValue, 20); // connect
-
-	ca.destinationRoutingAddress.list.count = 1;
-	cpn_arr = &cpn;
-	ca.destinationRoutingAddress.list.array = &cpn_arr;
-
-	cpn.buf = (void *) "1234567890";
-	cpn.size = 10;
-
-	cmp.choice.invoke.parameter = ANY_new_fromType(&asn_DEF_ConnectArg, &ca);
-
-	ret = tcap_encode(&buf, &msg);
+	ret = tcap_encode_with_routing(&buf, number, sizeof(number) - 1);
 	fprintf(stderr, "ret: %i\n", ret);
-    if(ret < 0) {
-	    fprintf(stderr, "failed to encode tcap\n");
-    } else {
-	    fwrite(buf, ret, 1, stdout);
-    }
+	if (ret < 0) {
+		fprintf(stderr, "failed to encode tcap\n");
+	} else {
+		fwrite(buf, ret, 1, stdout);
+	}
 
 	free(buf);
-	asn_DEF_ANY.free_struct(&asn_DEF_ANY, cmp.choice.invoke.parameter, 0);
 
 	return 0;
 }