diff --git a/openbsc/include/openbsc/signal.h b/openbsc/include/openbsc/signal.h
index 2ce812d..8f0f8cb 100644
--- a/openbsc/include/openbsc/signal.h
+++ b/openbsc/include/openbsc/signal.h
@@ -38,6 +38,7 @@
 	SS_ABISIP,
 	SS_NM,
 	SS_LCHAN,
+	SS_SUBSCR,
 };
 
 /* SS_PAGING signals */
@@ -69,6 +70,12 @@
 	S_LCHAN_UNEXPECTED_RELEASE,
 };
 
+/* SS_SUBSCR signals */
+enum signal_subscr {
+	S_SUBSCR_ATTACHED,
+	S_SUBSCR_DETACHED,
+};
+
 typedef int signal_cbfn(unsigned int subsys, unsigned int signal,
 			void *handler_data, void *signal_data);
 
diff --git a/openbsc/src/gsm_subscriber.c b/openbsc/src/gsm_subscriber.c
index 0bcbdf4..fe7bb6ac 100644
--- a/openbsc/src/gsm_subscriber.c
+++ b/openbsc/src/gsm_subscriber.c
@@ -32,6 +32,7 @@
 #include <openbsc/paging.h>
 #include <openbsc/debug.h>
 #include <openbsc/paging.h>
+#include <openbsc/signal.h>
 #include <openbsc/db.h>
 
 LLIST_HEAD(active_subscribers);
@@ -170,11 +171,13 @@
 		s->net = bts->network;
 		/* Indicate "attached to LAC" */
 		s->lac = bts->location_area_code;
+		dispatch_signal(SS_SUBSCR, S_SUBSCR_ATTACHED, s);
 		break;
 	case GSM_SUBSCRIBER_UPDATE_DETACHED:
 		/* Only detach if we are currently in this area */
 		if (bts->location_area_code == s->lac)
 			s->lac = 0;
+		dispatch_signal(SS_SUBSCR, S_SUBSCR_DETACHED, s);
 		break;
 	default:
 		fprintf(stderr, "subscr_update with unknown reason: %d\n",