diff --git a/lib/sch.h b/lib/sch.h
new file mode 100644
index 0000000..11a6d06
--- /dev/null
+++ b/lib/sch.h
@@ -0,0 +1,19 @@
+
+#ifndef __SCH_H__
+#define __SCH_H__ 1
+
+#include <gsm/api.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+  GSM_API int decode_sch(const unsigned char *buf, int * t1_o, int * t2_o, int * t3_o, int * ncc, int * bcc);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+