add a equipment table
diff --git a/include/openbsc/gsm_subscriber.h b/include/openbsc/gsm_subscriber.h
index 03333d4..0eb3654 100644
--- a/include/openbsc/gsm_subscriber.h
+++ b/include/openbsc/gsm_subscriber.h
@@ -4,11 +4,13 @@
 #include <sys/types.h>
 #include "gsm_data.h"
 
+#define GSM_IMEI_LENGTH 17
 #define GSM_IMSI_LENGTH 17
 #define GSM_TMSI_LENGTH 17
 #define GSM_NAME_LENGTH 128
 
 struct gsm_subscriber {
+	u_int64_t id;
 	char imsi[GSM_IMSI_LENGTH];
 	char tmsi[GSM_TMSI_LENGTH];
 	u_int16_t lac;