diff --git a/openbsc/include/openbsc/gsm_subscriber.h b/openbsc/include/openbsc/gsm_subscriber.h
index 3efb20c..0abf17a 100644
--- a/openbsc/include/openbsc/gsm_subscriber.h
+++ b/openbsc/include/openbsc/gsm_subscriber.h
@@ -11,6 +11,8 @@
 #define GSM_NAME_LENGTH 128
 #define GSM_EXTENSION_LENGTH 128
 
+#define GSM_SUBSCRIBER_FIRST_CONTACT	0x00000001
+
 struct gsm_equipment {
 	long long unsigned int id;
 	char imei[GSM_IMEI_LENGTH];
@@ -33,6 +35,9 @@
 	char extension[GSM_EXTENSION_LENGTH];
 	int authorized;
 
+	/* Temporary field which is not stored in the DB/HLR */
+	u_int32_t flags;
+
 	/* Every user can only have one equipment in use at any given
 	 * point in time */
 	struct gsm_equipment equipment;
diff --git a/openbsc/include/openbsc/signal.h b/openbsc/include/openbsc/signal.h
index 1af8496..0dc1772 100644
--- a/openbsc/include/openbsc/signal.h
+++ b/openbsc/include/openbsc/signal.h
@@ -83,6 +83,7 @@
 enum signal_subscr {
 	S_SUBSCR_ATTACHED,
 	S_SUBSCR_DETACHED,
+	S_SUBSCR_FIRST_CONTACT,
 };
 
 typedef int signal_cbfn(unsigned int subsys, unsigned int signal,
diff --git a/openbsc/src/db.c b/openbsc/src/db.c
index 9ad39d3..e24b619 100644
--- a/openbsc/src/db.c
+++ b/openbsc/src/db.c
@@ -224,6 +224,7 @@
 	}
 
 	subscr = subscr_alloc();
+	subscr->flags |= GSM_SUBSCRIBER_FIRST_CONTACT;
 	if (!subscr)
 		return NULL;
 	result = dbi_conn_queryf(conn,
diff --git a/openbsc/src/gsm_04_08.c b/openbsc/src/gsm_04_08.c
index ec7b4d3..5c4465e 100644
--- a/openbsc/src/gsm_04_08.c
+++ b/openbsc/src/gsm_04_08.c
@@ -1151,8 +1151,12 @@
 
 	switch (mi_type) {
 	case GSM_MI_TYPE_IMSI:
-		if (!lchan->subscr)
+		if (!lchan->subscr) {
 			lchan->subscr = db_create_subscriber(net, mi_string);
+			if (lchan->subscr->flags & GSM_SUBSCRIBER_FIRST_CONTACT) {
+				dispatch_signal(SS_SUBSCR, S_SUBSCR_FIRST_CONTACT, &lchan->subscr);
+			}
+		}
 		if (lchan->loc_operation)
 			lchan->loc_operation->waiting_for_imsi = 0;
 		break;
@@ -1245,6 +1249,9 @@
 
 		/* look up subscriber based on IMSI */
 		subscr = db_create_subscriber(bts->network, mi_string);
+		if (subscr->flags & GSM_SUBSCRIBER_FIRST_CONTACT) {
+			dispatch_signal(SS_SUBSCR, S_SUBSCR_FIRST_CONTACT, &subscr);
+		}
 		break;
 	case GSM_MI_TYPE_TMSI:
 		DEBUGPC(DMM, "\n");