diff --git a/src/s1ap/asn1c/asnGenFiles/asn_internal.h b/src/s1ap/asn1c/asnGenFiles/asn_internal.h
new file mode 100644
index 0000000..77b270c
--- /dev/null
+++ b/src/s1ap/asn1c/asnGenFiles/asn_internal.h
@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 2003-2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+/*
+ * Declarations internally useful for the ASN.1 support code.
+ */
+#ifndef	ASN_INTERNAL_H
+#define	ASN_INTERNAL_H
+#ifndef __EXTENSIONS__
+#define __EXTENSIONS__          /* for Sun */
+#endif
+
+#include "asn_application.h"	/* Application-visible API */
+
+#ifndef	__NO_ASSERT_H__		/* Include assert.h only for internal use. */
+#include <assert.h>		/* for assert() macro */
+#endif
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/* Environment version might be used to avoid running with the old library */
+#define	ASN1C_ENVIRONMENT_VERSION	923	/* Compile-time version */
+int get_asn1c_environment_version(void);	/* Run-time version */
+
+#define	CALLOC(nmemb, size)	calloc(nmemb, size)
+#define	MALLOC(size)		malloc(size)
+#define	REALLOC(oldptr, size)	realloc(oldptr, size)
+#define	FREEMEM(ptr)		free(ptr)
+
+#define	asn_debug_indent	0
+#define ASN_DEBUG_INDENT_ADD(i) do{}while(0)
+
+#ifdef  EMIT_ASN_DEBUG
+#warning "Use ASN_EMIT_DEBUG instead of EMIT_ASN_DEBUG"
+#define ASN_EMIT_DEBUG  EMIT_ASN_DEBUG
+#endif
+
+/*
+ * A macro for debugging the ASN.1 internals.
+ * You may enable or override it.
+ */
+#ifndef	ASN_DEBUG	/* If debugging code is not defined elsewhere... */
+#if	ASN_EMIT_DEBUG == 1	/* And it was asked to emit this code... */
+#if __STDC_VERSION__ >= 199901L
+#ifdef	ASN_THREAD_SAFE
+/* Thread safety requires sacrifice in output indentation:
+ * Retain empty definition of ASN_DEBUG_INDENT_ADD. */
+#else	/* !ASN_THREAD_SAFE */
+#undef  ASN_DEBUG_INDENT_ADD
+#undef  asn_debug_indent
+int asn_debug_indent;
+#define ASN_DEBUG_INDENT_ADD(i) do { asn_debug_indent += i; } while(0)
+#endif	/* ASN_THREAD_SAFE */
+#define	ASN_DEBUG(fmt, args...)	do {			\
+		int adi = asn_debug_indent;		\
+		while(adi--) fprintf(stderr, " ");	\
+		fprintf(stderr, fmt, ##args);		\
+		fprintf(stderr, " (%s:%d)\n",		\
+			__FILE__, __LINE__);		\
+	} while(0)
+#else	/* !C99 */
+void CC_PRINTFLIKE(1, 2) ASN_DEBUG_f(const char *fmt, ...);
+#define	ASN_DEBUG	ASN_DEBUG_f
+#endif	/* C99 */
+#else	/* ASN_EMIT_DEBUG != 1 */
+#if __STDC_VERSION__ >= 199901L
+#define ASN_DEBUG(...) do{}while(0)
+#else   /* not C99 */
+static void CC_PRINTFLIKE(1, 2) ASN_DEBUG(const char *fmt, ...) { (void)fmt; }
+#endif  /* C99 or better */
+#endif	/* ASN_EMIT_DEBUG */
+#endif	/* ASN_DEBUG */
+
+/*
+ * Print to a callback.
+ * The callback is expected to return negative values on error.
+ * 0 and positive values are treated as success.
+ * RETURN VALUES:
+ *  -1: Failed to format or invoke the callback.
+ *  >0: Size of the data that got delivered to the callback.
+ */
+ssize_t CC_PRINTFLIKE(3, 4)
+asn__format_to_callback(
+    int (*callback)(const void *, size_t, void *key), void *key,
+    const char *fmt, ...);
+
+/*
+ * Invoke the application-supplied callback and fail, if something is wrong.
+ */
+#define ASN__E_cbc(buf, size) (cb((buf), (size), app_key) < 0)
+#define ASN__E_CALLBACK(size, foo) \
+    do {                           \
+        if(foo) goto cb_failed;    \
+        er.encoded += (size);      \
+    } while(0)
+#define ASN__CALLBACK(buf, size) ASN__E_CALLBACK(size, ASN__E_cbc(buf, size))
+#define ASN__CALLBACK2(buf1, size1, buf2, size2) \
+    ASN__E_CALLBACK((size1) + (size2),           \
+                    ASN__E_cbc(buf1, size1) || ASN__E_cbc(buf2, size2))
+#define ASN__CALLBACK3(buf1, size1, buf2, size2, buf3, size3)          \
+    ASN__E_CALLBACK((size1) + (size2) + (size3),                       \
+                    ASN__E_cbc(buf1, size1) || ASN__E_cbc(buf2, size2) \
+                        || ASN__E_cbc(buf3, size3))
+
+#define ASN__TEXT_INDENT(nl, level)                                          \
+    do {                                                                     \
+        int tmp_level = (level);                                             \
+        int tmp_nl = ((nl) != 0);                                            \
+        int tmp_i;                                                           \
+        if(tmp_nl) ASN__CALLBACK("\n", 1);                                   \
+        if(tmp_level < 0) tmp_level = 0;                                     \
+        for(tmp_i = 0; tmp_i < tmp_level; tmp_i++) ASN__CALLBACK("    ", 4); \
+    } while(0)
+
+#define	_i_INDENT(nl)	do {                        \
+        int tmp_i;                                  \
+        if((nl) && cb("\n", 1, app_key) < 0)        \
+            return -1;                              \
+        for(tmp_i = 0; tmp_i < ilevel; tmp_i++)     \
+            if(cb("    ", 4, app_key) < 0)          \
+                return -1;                          \
+    } while(0)
+
+/*
+ * Check stack against overflow, if limit is set.
+ */
+#define	ASN__DEFAULT_STACK_MAX	(30000)
+static int CC_NOTUSED
+ASN__STACK_OVERFLOW_CHECK(const asn_codec_ctx_t *ctx) {
+	if(ctx && ctx->max_stack_size) {
+
+		/* ctx MUST be allocated on the stack */
+		ptrdiff_t usedstack = ((const char *)ctx - (const char *)&ctx);
+		if(usedstack > 0) usedstack = -usedstack; /* grows up! */
+
+		/* double negative required to avoid int wrap-around */
+		if(usedstack < -(ptrdiff_t)ctx->max_stack_size) {
+			ASN_DEBUG("Stack limit %ld reached",
+				(long)ctx->max_stack_size);
+			return -1;
+		}
+	}
+	return 0;
+}
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* ASN_INTERNAL_H */