diff --git a/lib/decoding/GSM690Tables.h b/lib/decoding/GSM690Tables.h
new file mode 100644
index 0000000..6b9bb36
--- /dev/null
+++ b/lib/decoding/GSM690Tables.h
@@ -0,0 +1,31 @@
+/* AMR (GSM 06.90) importance bit ordering */
+
+/*
+ * Copyright 2010  Sylvain Munaut <tnt@246tNt.com>
+ * All Rights Reserved
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GSM690TABLES_H
+#define GSM690TABLES_H
+
+namespace GSM {
+
+/** Table #7 from GSM 05.03 */
+extern unsigned int g690_12_2_BitOrder[244];
+
+}
+
+#endif /* GSM690TABLES_H */