diff --git a/openbsc/include/openbsc/db.h b/openbsc/include/openbsc/db.h
index 61a3ac4..c9b7265 100644
--- a/openbsc/include/openbsc/db.h
+++ b/openbsc/include/openbsc/db.h
@@ -31,14 +31,17 @@
 int db_fini();
 
 /* subscriber management */
-struct gsm_subscriber* db_create_subscriber(char *imsi);
-struct gsm_subscriber* db_get_subscriber(enum gsm_subscriber_field field, const char *subscr);
+struct gsm_subscriber* db_create_subscriber(struct gsm_network *net,
+					    char *imsi);
+struct gsm_subscriber* db_get_subscriber(struct gsm_network *net,
+					 enum gsm_subscriber_field field,
+					 const char *subscr);
 int db_sync_subscriber(struct gsm_subscriber* subscriber);
 int db_subscriber_alloc_tmsi(struct gsm_subscriber* subscriber);
 int db_subscriber_assoc_imei(struct gsm_subscriber* subscriber, char *imei);
 
 /* SMS store-and-forward */
 int db_sms_store(struct gsm_sms *sms);
-struct gsm_sms *db_sms_get_unsent(int min_id);
+struct gsm_sms *db_sms_get_unsent(struct gsm_network *net, int min_id);
 int db_sms_mark_sent(struct gsm_sms *sms);
 #endif /* _DB_H */
diff --git a/openbsc/include/openbsc/gsm_subscriber.h b/openbsc/include/openbsc/gsm_subscriber.h
index 4a23115..00eeb32 100644
--- a/openbsc/include/openbsc/gsm_subscriber.h
+++ b/openbsc/include/openbsc/gsm_subscriber.h
@@ -60,9 +60,12 @@
 
 struct gsm_subscriber *subscr_get(struct gsm_subscriber *subscr);
 struct gsm_subscriber *subscr_put(struct gsm_subscriber *subscr);
-struct gsm_subscriber *subscr_get_by_tmsi(const char *tmsi);
-struct gsm_subscriber *subscr_get_by_imsi(const char *imsi);
-struct gsm_subscriber *subscr_get_by_extension(const char *ext);
+struct gsm_subscriber *subscr_get_by_tmsi(struct gsm_network *net,
+					  const char *tmsi);
+struct gsm_subscriber *subscr_get_by_imsi(struct gsm_network *net,
+					  const char *imsi);
+struct gsm_subscriber *subscr_get_by_extension(struct gsm_network *net,
+					       const char *ext);
 int subscr_update(struct gsm_subscriber *s, struct gsm_bts *bts, int reason);
 void subscr_put_channel(struct gsm_lchan *lchan);
 void subscr_get_channel(struct gsm_subscriber *subscr,
diff --git a/openbsc/src/db.c b/openbsc/src/db.c
index 543f44c..fc2950a 100644
--- a/openbsc/src/db.c
+++ b/openbsc/src/db.c
@@ -158,12 +158,13 @@
 	return 0;
 }
 
-struct gsm_subscriber* db_create_subscriber(char *imsi) {
+struct gsm_subscriber* db_create_subscriber(struct gsm_network *net, char *imsi)
+{
 	dbi_result result;
 	struct gsm_subscriber* subscr;
 
 	/* Is this subscriber known in the db? */
-	subscr = db_get_subscriber(GSM_SUBSCRIBER_IMSI, imsi); 
+	subscr = db_get_subscriber(net, GSM_SUBSCRIBER_IMSI, imsi); 
 	if (subscr) {
 		result = dbi_conn_queryf(conn,
                          "UPDATE Subscriber set updated = datetime('now') "
@@ -189,6 +190,7 @@
 	if (result==NULL) {
 		printf("DB: Failed to create Subscriber by IMSI.\n");
 	}
+	subscr->net = net;
 	subscr->id = dbi_conn_sequence_last(conn, NULL);
 	strncpy(subscr->imsi, imsi, GSM_IMSI_LENGTH-1);
 	dbi_result_free(result);
@@ -196,7 +198,10 @@
 	return subscr;
 }
 
-struct gsm_subscriber *db_get_subscriber(enum gsm_subscriber_field field, const char *id) {
+struct gsm_subscriber *db_get_subscriber(struct gsm_network *net,
+					 enum gsm_subscriber_field field,
+					 const char *id)
+{
 	dbi_result result;
 	const char *string;
 	char *quoted;
@@ -246,6 +251,7 @@
 	}
 
 	subscr = subscr_alloc();
+	subscr->net = net;
 	subscr->id = dbi_result_get_ulonglong(result, "id");
 	string = dbi_result_get_string(result, "imsi");
 	if (string)
@@ -459,7 +465,7 @@
 }
 
 /* retrieve the next unsent SMS with ID >= min_id */
-struct gsm_sms *db_sms_get_unsent(int min_id)
+struct gsm_sms *db_sms_get_unsent(struct gsm_network *net, int min_id)
 {
 	dbi_result result;
 	struct gsm_sms *sms = malloc(sizeof(*sms));
diff --git a/openbsc/src/gsm_04_08.c b/openbsc/src/gsm_04_08.c
index 4359f87..507daf9 100644
--- a/openbsc/src/gsm_04_08.c
+++ b/openbsc/src/gsm_04_08.c
@@ -1131,6 +1131,8 @@
 {
 	struct gsm48_hdr *gh = msgb_l3(msg);
 	struct gsm_lchan *lchan = msg->lchan;
+	struct gsm_bts *bts = lchan->ts->trx->bts;
+	struct gsm_network *net = bts->network;
 	u_int8_t mi_type = gh->data[1] & GSM_MI_TYPE_MASK;
 	char mi_string[MI_SIZE];
 
@@ -1141,7 +1143,7 @@
 	switch (mi_type) {
 	case GSM_MI_TYPE_IMSI:
 		if (!lchan->subscr)
-			lchan->subscr = db_create_subscriber(mi_string);
+			lchan->subscr = db_create_subscriber(net, mi_string);
 		if (lchan->loc_operation)
 			lchan->loc_operation->waiting_for_imsi = 0;
 		break;
@@ -1198,6 +1200,7 @@
 	struct gsm48_loc_upd_req *lu;
 	struct gsm_subscriber *subscr = NULL;
 	struct gsm_lchan *lchan = msg->lchan;
+	struct gsm_bts *bts = lchan->ts->trx->bts;
 	u_int8_t mi_type;
 	char mi_string[MI_SIZE];
 	int rc;
@@ -1232,7 +1235,7 @@
 		lchan->loc_operation->waiting_for_imei = 1;
 
 		/* look up subscriber based on IMSI */
-		subscr = db_create_subscriber(mi_string);
+		subscr = db_create_subscriber(bts->network, mi_string);
 		break;
 	case GSM_MI_TYPE_TMSI:
 		DEBUGPC(DMM, "\n");
@@ -1241,7 +1244,7 @@
 		lchan->loc_operation->waiting_for_imei = 1;
 
 		/* look up the subscriber based on TMSI, request IMSI if it fails */
-		subscr = subscr_get_by_tmsi(mi_string);
+		subscr = subscr_get_by_tmsi(bts->network, mi_string);
 		if (!subscr) {
 			/* send IDENTITY REQUEST message to get IMSI */
 			rc = mm_tx_identity_req(lchan, GSM_MI_TYPE_IMSI);
@@ -1423,6 +1426,7 @@
 	u_int8_t mi_type;
 	char mi_string[MI_SIZE];
 
+	struct gsm_bts *bts = msg->lchan->ts->trx->bts;
 	struct gsm_subscriber *subscr;
 	struct gsm48_hdr *gh = msgb_l3(msg);
 	struct gsm48_service_request *req =
@@ -1457,7 +1461,7 @@
 	DEBUGPC(DMM, "serv_type=0x%02x mi_type=0x%02x M(%s)\n",
 		req->cm_service_type, mi_type, mi_string);
 
-	subscr = subscr_get_by_tmsi(mi_string);
+	subscr = subscr_get_by_tmsi(bts->network, mi_string);
 
 	/* FIXME: if we don't know the TMSI, inquire abit IMSI and allocate new TMSI */
 	if (!subscr)
@@ -1480,6 +1484,7 @@
 
 static int gsm48_rx_mm_imsi_detach_ind(struct msgb *msg)
 {
+	struct gsm_bts *bts = msg->lchan->ts->trx->bts;
 	struct gsm48_hdr *gh = msgb_l3(msg);
 	struct gsm48_imsi_detach_ind *idi =
 				(struct gsm48_imsi_detach_ind *) gh->data;
@@ -1493,10 +1498,10 @@
 
 	switch (mi_type) {
 	case GSM_MI_TYPE_TMSI:
-		subscr = subscr_get_by_tmsi(mi_string);
+		subscr = subscr_get_by_tmsi(bts->network, mi_string);
 		break;
 	case GSM_MI_TYPE_IMSI:
-		subscr = subscr_get_by_imsi(mi_string);
+		subscr = subscr_get_by_imsi(bts->network, mi_string);
 		break;
 	case GSM_MI_TYPE_IMEI:
 	case GSM_MI_TYPE_IMEISV:
@@ -1576,6 +1581,7 @@
 /* Receive a PAGING RESPONSE message from the MS */
 static int gsm48_rr_rx_pag_resp(struct msgb *msg)
 {
+	struct gsm_bts *bts = msg->lchan->ts->trx->bts;
 	struct gsm48_hdr *gh = msgb_l3(msg);
 	u_int8_t *classmark2_lv = gh->data + 1;
 	u_int8_t *mi_lv = gh->data + 2 + *classmark2_lv;
@@ -1590,10 +1596,10 @@
 		mi_type, mi_string);
 	switch (mi_type) {
 	case GSM_MI_TYPE_TMSI:
-		subscr = subscr_get_by_tmsi(mi_string);
+		subscr = subscr_get_by_tmsi(bts->network, mi_string);
 		break;
 	case GSM_MI_TYPE_IMSI:
-		subscr = subscr_get_by_imsi(mi_string);
+		subscr = subscr_get_by_imsi(bts->network, mi_string);
 		break;
 	}
 
@@ -3381,9 +3387,10 @@
 		}
 		/* New transaction due to setup, find subscriber */
 		if (data->called.number[0])
-			subscr = subscr_get_by_extension(data->called.number);
+			subscr = subscr_get_by_extension(net,
+							data->called.number);
 		else
-			subscr = subscr_get_by_imsi(data->imsi);
+			subscr = subscr_get_by_imsi(net, data->imsi);
 		/* If subscriber is not found */
 		if (!subscr) {
 			DEBUGP(DCC, "(bts - trx - ts - ti -- sub %s) "
diff --git a/openbsc/src/gsm_04_11.c b/openbsc/src/gsm_04_11.c
index 1b622b1..8db402b 100644
--- a/openbsc/src/gsm_04_11.c
+++ b/openbsc/src/gsm_04_11.c
@@ -154,6 +154,7 @@
 /* process an incoming TPDU (called from RP-DATA) */
 static int gsm340_rx_tpdu(struct msgb *msg)
 {
+	struct gsm_bts *bts = msg->lchan->ts->trx->bts;
 	u_int8_t *smsp = msgb_sms(msg);
 	struct sms_submit *sms;
 	struct gsm_sms *gsms;
@@ -257,7 +258,7 @@
 	/* FIXME: sender refcount */
 
 	/* determine gsms->receiver based on dialled number */
-	gsms->receiver = subscr_get_by_extension(sms->dest_addr);
+	gsms->receiver = subscr_get_by_extension(bts->network, sms->dest_addr);
 	if (!gsms->receiver) {
 		rc = 1; /* cause 1: unknown subscriber */
 		goto out;
diff --git a/openbsc/src/gsm_subscriber.c b/openbsc/src/gsm_subscriber.c
index 56f1595..e892906 100644
--- a/openbsc/src/gsm_subscriber.c
+++ b/openbsc/src/gsm_subscriber.c
@@ -126,7 +126,8 @@
 	talloc_free(subscr);
 }
 
-struct gsm_subscriber *subscr_get_by_tmsi(const char *tmsi)
+struct gsm_subscriber *subscr_get_by_tmsi(struct gsm_network *net,
+					  const char *tmsi)
 {
 	struct gsm_subscriber *subscr;
 
@@ -136,10 +137,11 @@
 			return subscr_get(subscr);
 	}
 
-	return db_get_subscriber(GSM_SUBSCRIBER_TMSI, tmsi);
+	return db_get_subscriber(net, GSM_SUBSCRIBER_TMSI, tmsi);
 }
 
-struct gsm_subscriber *subscr_get_by_imsi(const char *imsi)
+struct gsm_subscriber *subscr_get_by_imsi(struct gsm_network *net,
+					  const char *imsi)
 {
 	struct gsm_subscriber *subscr;
 
@@ -148,10 +150,11 @@
 			return subscr_get(subscr);
 	}
 
-	return db_get_subscriber(GSM_SUBSCRIBER_IMSI, imsi);
+	return db_get_subscriber(net, GSM_SUBSCRIBER_IMSI, imsi);
 }
 
-struct gsm_subscriber *subscr_get_by_extension(const char *ext)
+struct gsm_subscriber *subscr_get_by_extension(struct gsm_network *net,
+					       const char *ext)
 {
 	struct gsm_subscriber *subscr;
 
@@ -160,7 +163,7 @@
 			return subscr_get(subscr);
 	}
 
-	return db_get_subscriber(GSM_SUBSCRIBER_EXTENSION, ext);
+	return db_get_subscriber(net, GSM_SUBSCRIBER_EXTENSION, ext);
 }
 
 int subscr_update(struct gsm_subscriber *s, struct gsm_bts *bts, int reason)
diff --git a/openbsc/src/vty_interface.c b/openbsc/src/vty_interface.c
index 4626890..11b2ff6 100644
--- a/openbsc/src/vty_interface.c
+++ b/openbsc/src/vty_interface.c
@@ -589,7 +589,7 @@
 	const char *imsi = argv[0];
 	struct gsm_subscriber *subscr;
 
-	subscr = subscr_get_by_imsi(imsi);
+	subscr = subscr_get_by_imsi(gsmnet, imsi);
 	if (!subscr) {
 		vty_out(vty, "%% No subscriber for IMSI %s%s",
 			imsi, VTY_NEWLINE);
@@ -855,7 +855,7 @@
 
 	if (argc >= 1) {
 		imsi = argv[0];
-		subscr = subscr_get_by_imsi(imsi);
+		subscr = subscr_get_by_imsi(gsmnet, imsi);
 		if (!subscr) {
 			vty_out(vty, "%% unknown subscriber%s",
 				VTY_NEWLINE);