diff --git a/Makefile b/Makefile
index 478ba65..1302688 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 export LIBNAME=libtcap
-export VERSION=0
+export VERSION=1
 export LIBSO=$(LIBNAME).so
 export LIBSOVER=$(LIBNAME).so.$(VERSION)
 
@@ -29,7 +29,6 @@ clean:
 install: all
 	mkdir -p $(DESTDIR)/$(HDR)
 	cp include/*.h $(DESTDIR)/$(HDR)
-	cp asn1-compiled/*.h $(DESTDIR)/$(HDR)
 	mkdir -p $(DESTDIR)/$(LIBDIR)
 	cp src/$(LIBSOVER) $(DESTDIR)/$(LIBDIR)/$(LIBSOVER)
 	ln -s $(LIBSOVER) $(DESTDIR)/$(LIBDIR)/$(LIBSO)
diff --git a/debian/.gitignore b/debian/.gitignore
index c999930..a7b9d21 100644
--- a/debian/.gitignore
+++ b/debian/.gitignore
@@ -5,4 +5,4 @@
 /debhelper-build-stamp
 /files
 /ngcp-libtcap-dev/
-/ngcp-libtcap0/
+/ngcp-libtcap1/
diff --git a/debian/control b/debian/control
index 78d34ec..846481f 100644
--- a/debian/control
+++ b/debian/control
@@ -7,7 +7,7 @@ Standards-Version: 3.9.8
 Build-Depends:
  debhelper-compat (= 12),
 
-Package: ngcp-libtcap0
+Package: ngcp-libtcap1
 Architecture: any
 Depends:
  ${misc:Depends},
@@ -20,7 +20,7 @@ Package: ngcp-libtcap-dev
 Architecture: any
 Section: libdevel
 Depends:
- ngcp-libtcap0 (= ${binary:Version}),
+ ngcp-libtcap1 (= ${binary:Version}),
  ${misc:Depends},
 Description: Headers for ngcp-libtcap0
  Library providing handling ASN.1-coded TCAP and INAP messages
diff --git a/debian/ngcp-libtcap0.install b/debian/ngcp-libtcap1.install
similarity index 100%
rename from debian/ngcp-libtcap0.install
rename to debian/ngcp-libtcap1.install
diff --git a/include/libtcap.h b/include/libtcap.h
index 2ed1b36..0042c40 100644
--- a/include/libtcap.h
+++ b/include/libtcap.h
@@ -4,11 +4,6 @@
 #include <stddef.h>
 #include <stdint.h>
 
-#include "TCMessage.h"
-#include "Invoke.h"
-#include "constr_TYPE.h"
-
-
 struct output_buffer {
 	char *buf;
 	size_t buf_size;
@@ -23,15 +18,9 @@ static inline void output_buffer_init(struct output_buffer *o, char *i, size_t s
 
 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);
-void *inap_decode(Invoke_t *invoke, asn_TYPE_descriptor_t **);
 int tcap_extract(const char *buf, size_t len, const char *spec, struct output_buffer *out);
 int inap_extract(const char *buf, size_t len, const char *spec, struct output_buffer *out);
 int isup_convert_number(const char *inp, int inlen, char *out);
 int isup_convert_number_hex(const char *inp, int inlen, char *out);
 
-int tcap_encode(char **out, TCMessage_t *msg);
-
-
 #endif
diff --git a/src/.gitignore b/src/.gitignore
index 3f05b2d..74e0493 100644
--- a/src/.gitignore
+++ b/src/.gitignore
@@ -1,4 +1,4 @@
 *.sw?
 *.so
-*.so.0
+*.so.*
 *.o
diff --git a/src/Makefile b/src/Makefile
index c0d5973..e481410 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -5,6 +5,7 @@ CFLAGS := -g -Wall -O3
 CFLAGS += -fPIC
 LDFLAGS := -O3
 LDFLAGS += -shared -fPIC -Wl,-soname,$(LIBNAME).so.$(VERSION)
+LDFLAGS += -Wl,--version-script=libtcap.map
 
 OBJS=tcap.o
 
diff --git a/src/libtcap.map b/src/libtcap.map
new file mode 100644
index 0000000..a3ea0d2
--- /dev/null
+++ b/src/libtcap.map
@@ -0,0 +1,11 @@
+LIBTCAP_1 {
+global:
+	tcap_encode_with_routing;
+	tcap_extract;
+	inap_extract;
+	isup_convert_number;
+	isup_convert_number_hex;
+
+local:
+	*;
+};
diff --git a/src/tcap.c b/src/tcap.c
index 67c9d2b..02ec309 100644
--- a/src/tcap.c
+++ b/src/tcap.c
@@ -48,7 +48,7 @@ static int buf_append(const void *buffer, size_t size, void *app_key) {
 	return (ret == 1) ? 0 : -1;
 }
 
-int tcap_encode(char **out, TCMessage_t *msg) {
+static int tcap_encode(char **out, TCMessage_t *msg) {
 	FILE *fp;
 	char *str;
 	size_t len;
@@ -118,7 +118,7 @@ int tcap_encode_with_routing(char **out, const uint8_t *routing, size_t routing_
 	return ret;
 }
 
-TCMessage_t *tcap_decode(const char *buf, size_t len) {
+static TCMessage_t *tcap_decode(const char *buf, size_t len) {
 	TCMessage_t *ret = NULL;
 	asn_dec_rval_t rv;
 
@@ -131,7 +131,7 @@ TCMessage_t *tcap_decode(const char *buf, size_t len) {
 	return NULL;
 }
 
-void *inap_decode(Invoke_t *invoke, asn_TYPE_descriptor_t **type) {
+static void *inap_decode(Invoke_t *invoke, asn_TYPE_descriptor_t **type) {
 	long opcode;
 	int rv;
 	void *arg = 0;