diff --git a/openbsc/include/openbsc/signal.h b/openbsc/include/openbsc/signal.h
index d59bb9726..10fcddda3 100644
--- a/openbsc/include/openbsc/signal.h
+++ b/openbsc/include/openbsc/signal.h
@@ -91,6 +91,7 @@ enum signal_lchan {
 enum signal_subscr {
 	S_SUBSCR_ATTACHED,
 	S_SUBSCR_DETACHED,
+	S_SUBSCR_IDENTITY,		/* we've received some identity information */
 };
 
 /* SS_SCALL signals */
diff --git a/openbsc/src/gsm_04_08.c b/openbsc/src/gsm_04_08.c
index e1374c9ae..ce93f0130 100644
--- a/openbsc/src/gsm_04_08.c
+++ b/openbsc/src/gsm_04_08.c
@@ -954,6 +954,8 @@ static int mm_rx_id_resp(struct msgb *msg)
 	DEBUGP(DMM, "IDENTITY RESPONSE: mi_type=0x%02x MI(%s)\n",
 		mi_type, mi_string);
 
+	dispatch_signal(SS_SUBSCR, S_SUBSCR_IDENTITY, gh->data);
+
 	switch (mi_type) {
 	case GSM_MI_TYPE_IMSI:
 		/* look up subscriber based on IMSI, create if not found */
@@ -1034,6 +1036,8 @@ static int mm_rx_loc_upd_req(struct msgb *msg)
 	DEBUGPC(DMM, "mi_type=0x%02x MI(%s) type=%s ", mi_type, mi_string,
 		lupd_name(lu->type));
 
+	dispatch_signal(SS_SUBSCR, S_SUBSCR_IDENTITY, &lu->mi_len);
+
 	/*
 	 * Pseudo Spoof detection: Just drop a second/concurrent
 	 * location updating request.
@@ -1317,6 +1321,8 @@ static int gsm48_rx_mm_serv_req(struct msgb *msg)
 	DEBUGPC(DMM, "serv_type=0x%02x mi_type=0x%02x M(%s)\n",
 		req->cm_service_type, mi_type, mi_string);
 
+	dispatch_signal(SS_SUBSCR, S_SUBSCR_IDENTITY, (classmark2 + classmark2_len));
+
 	if (is_siemens_bts(bts))
 		send_siemens_mrpci(msg->lchan, classmark2-1);