diff --git a/openbsc/include/openbsc/gsm_data.h b/openbsc/include/openbsc/gsm_data.h
index f90e60d..81de84f 100644
--- a/openbsc/include/openbsc/gsm_data.h
+++ b/openbsc/include/openbsc/gsm_data.h
@@ -428,4 +428,16 @@
 	return 0;
 }
 
+static inline int is_siemens_bts(struct gsm_bts *bts)
+{
+	switch (bts->type) {
+	case GSM_BTS_TYPE_BS11:
+		return 1;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
 #endif