diff --git a/openbsc/include/openbsc/Makefile.am b/openbsc/include/openbsc/Makefile.am
index 325d66d..f87eca1 100644
--- a/openbsc/include/openbsc/Makefile.am
+++ b/openbsc/include/openbsc/Makefile.am
@@ -11,7 +11,8 @@
 		gb_proxy.h gprs_sgsn.h gsm_04_08_gprs.h sgsn.h \
 		gprs_ns_frgre.h auth.h osmo_msc.h bsc_msc.h bsc_nat.h \
 		osmo_bsc_rf.h osmo_bsc.h network_listen.h bsc_nat_sccp.h \
-		osmo_msc_data.h osmo_bsc_grace.h sms_queue.h abis_om2000.h
+		osmo_msc_data.h osmo_bsc_grace.h sms_queue.h abis_om2000.h \
+		bss.h
 
 openbsc_HEADERS = gsm_04_08.h meas_rep.h bsc_api.h
 openbscdir = $(includedir)/openbsc
diff --git a/openbsc/include/openbsc/bss.h b/openbsc/include/openbsc/bss.h
new file mode 100644
index 0000000..05495dd
--- /dev/null
+++ b/openbsc/include/openbsc/bss.h
@@ -0,0 +1,17 @@
+#ifndef _BSS_H_
+#define _BSS_H_
+
+struct gsm_network;
+struct msgb;
+
+/* start and stop network */
+extern int bsc_bootstrap_network(int (*mncc_recv)(struct gsm_network *, struct msgb *), const char *cfg_file);
+extern int bsc_shutdown_net(struct gsm_network *net);
+
+/* register all supported BTS */
+extern int bts_init(void);
+extern int bts_model_bs11_init(void);
+extern int bts_model_rbs2k_init(void);
+extern int bts_model_nanobts_init(void);
+extern int bts_model_hslfemto_init(void);
+#endif
diff --git a/openbsc/include/openbsc/e1_input.h b/openbsc/include/openbsc/e1_input.h
index 0eae5d9..0d79c7d 100644
--- a/openbsc/include/openbsc/e1_input.h
+++ b/openbsc/include/openbsc/e1_input.h
@@ -175,6 +175,7 @@
 
 int ia_config_connect(struct gsm_bts *bts, struct sockaddr_in *sin);
 int ipaccess_setup(struct gsm_network *gsmnet);
+int hsl_setup(struct gsm_network *gsmnet);
 
 extern struct llist_head e1inp_driver_list;
 extern struct llist_head e1inp_line_list;
diff --git a/openbsc/include/openbsc/gsm_data.h b/openbsc/include/openbsc/gsm_data.h
index bc276d1..c3cf104 100644
--- a/openbsc/include/openbsc/gsm_data.h
+++ b/openbsc/include/openbsc/gsm_data.h
@@ -1,6 +1,7 @@
 #ifndef _GSM_DATA_H
 #define _GSM_DATA_H
 
+#include <stdbool.h>
 
 struct osmo_msc_data;
 struct osmo_bsc_sccp_con;
@@ -434,6 +435,8 @@
 	enum gsm_bts_type type;
 	const char *name;
 
+	bool started;
+	int (*start)(struct gsm_network *net);
 	int (*oml_rcvmsg)(struct msgb *msg);
 
 	void (*config_write_bts)(struct vty *vty, struct gsm_bts *bts);
diff --git a/openbsc/src/libbsc/Makefile.am b/openbsc/src/libbsc/Makefile.am
index 70f6c1c..3af4a2a 100644
--- a/openbsc/src/libbsc/Makefile.am
+++ b/openbsc/src/libbsc/Makefile.am
@@ -20,5 +20,5 @@
 			e1_config.c \
 			bsc_api.c bsc_msc.c bsc_vty.c \
 			gsm_04_08_utils.c \
-			bsc_init.c
+			bsc_init.c bts_init.c
 
diff --git a/openbsc/src/libbsc/bsc_init.c b/openbsc/src/libbsc/bsc_init.c
index ecb4e44..19453f7 100644
--- a/openbsc/src/libbsc/bsc_init.c
+++ b/openbsc/src/libbsc/bsc_init.c
@@ -315,6 +315,14 @@
 {
 	int i, n;
 
+	if (bts->model->start && !bts->model->started) {
+		int ret = bts->model->start(bts->network);
+		if (ret < 0)
+			return ret;
+
+		bts->model->started = true;
+	}
+
 	/* FIXME: What about secondary TRX of a BTS?  What about a BTS that has TRX
 	 * in different bands? Why is 'band' a parameter of the BTS and not of the TRX? */
 	switch (bts->band) {
@@ -456,10 +464,5 @@
 			return rc;
 		}
 	}
-
-	/* initialize nanoBTS support omce */
-	rc = ipaccess_setup(bsc_gsmnet);
-	rc = hsl_setup(bsc_gsmnet);
-
 	return 0;
 }
diff --git a/openbsc/src/libbsc/bts_ericsson_rbs2000.c b/openbsc/src/libbsc/bts_ericsson_rbs2000.c
index c2ae0e7..9c98a9f 100644
--- a/openbsc/src/libbsc/bts_ericsson_rbs2000.c
+++ b/openbsc/src/libbsc/bts_ericsson_rbs2000.c
@@ -242,14 +242,17 @@
 	abis_om2k_config_write_bts(vty, bts);
 }
 
+static int bts_model_rbs2k_start(struct gsm_network *net);
+
 static struct gsm_bts_model model_rbs2k = {
 	.type = GSM_BTS_TYPE_RBS2000,
 	.name = "rbs2000",
+	.start = bts_model_rbs2k_start,
 	.oml_rcvmsg = &abis_om2k_rcvmsg,
 	.config_write_bts = &config_write_bts,
 };
 
-int bts_model_rbs2k_init(void)
+static int bts_model_rbs2k_start(struct gsm_network *net)
 {
 	model_rbs2k.features.data = &model_rbs2k._features_data[0];
 	model_rbs2k.features.data_len = sizeof(model_rbs2k._features_data);
@@ -261,5 +264,10 @@
 	osmo_signal_register_handler(SS_GLOBAL, gbl_sig_cb, NULL);
 	osmo_signal_register_handler(SS_NM, nm_sig_cb, NULL);
 
+	return 0;
+}
+
+int bts_model_rbs2k_init(void)
+{
 	return gsm_bts_model_register(&model_rbs2k);
 }
diff --git a/openbsc/src/libbsc/bts_hsl_femtocell.c b/openbsc/src/libbsc/bts_hsl_femtocell.c
index 7264a21..f943693 100644
--- a/openbsc/src/libbsc/bts_hsl_femtocell.c
+++ b/openbsc/src/libbsc/bts_hsl_femtocell.c
@@ -30,8 +30,11 @@
 #include <openbsc/signal.h>
 #include <openbsc/e1_input.h>
 
+static int bts_model_hslfemto_start(struct gsm_network *net);
+
 static struct gsm_bts_model model_hslfemto = {
 	.type = GSM_BTS_TYPE_HSL_FEMTO,
+	.start = bts_model_hslfemto_start,
 	.nm_att_tlvdef = {
 		.def = {
 			/* no HSL specific OML attributes that we know of */
@@ -148,7 +151,7 @@
 	return 0;
 }
 
-int bts_model_hslfemto_init(void)
+static int bts_model_hslfemto_start(struct gsm_network *net)
 {
 	model_hslfemto.features.data = &model_hslfemto._features_data[0];
 	model_hslfemto.features.data_len = sizeof(model_hslfemto._features_data);
@@ -158,5 +161,11 @@
 
 	osmo_signal_register_handler(SS_INPUT, inp_sig_cb, NULL);
 
+	/* Call A-bis input driver, start socket for OML and RSL. */
+	return hsl_setup(net);
+}
+
+int bts_model_hslfemto_init(void)
+{
 	return gsm_bts_model_register(&model_hslfemto);
 }
diff --git a/openbsc/src/libbsc/bts_init.c b/openbsc/src/libbsc/bts_init.c
new file mode 100644
index 0000000..87bdde0
--- /dev/null
+++ b/openbsc/src/libbsc/bts_init.c
@@ -0,0 +1,29 @@
+/* (C) 2011 by Harald Welte <laforge@gnumonks.org>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#include <openbsc/bss.h>
+
+int bts_init(void)
+{
+	bts_model_bs11_init();
+	bts_model_rbs2k_init();
+	bts_model_nanobts_init();
+	bts_model_hslfemto_init();
+	/* Your new BTS here. */
+	return 0;
+}
diff --git a/openbsc/src/libbsc/bts_ipaccess_nanobts.c b/openbsc/src/libbsc/bts_ipaccess_nanobts.c
index 13bed22..706712e 100644
--- a/openbsc/src/libbsc/bts_ipaccess_nanobts.c
+++ b/openbsc/src/libbsc/bts_ipaccess_nanobts.c
@@ -26,10 +26,14 @@
 #include <openbsc/gsm_data.h>
 #include <openbsc/signal.h>
 #include <openbsc/abis_nm.h>
+#include <openbsc/e1_input.h> /* for ipaccess_setup() */
+
+static int bts_model_nanobts_start(struct gsm_network *net);
 
 static struct gsm_bts_model model_nanobts = {
 	.type = GSM_BTS_TYPE_NANOBTS,
 	.name = "nanobts",
+	.start = bts_model_nanobts_start,
 	.oml_rcvmsg = &abis_nm_rcvmsg,
 	.nm_att_tlvdef = {
 		.def = {
@@ -435,7 +439,7 @@
 	return 0;
 }
 
-int bts_model_nanobts_init(void)
+static int bts_model_nanobts_start(struct gsm_network *net)
 {
 	model_nanobts.features.data = &model_nanobts._features_data[0];
 	model_nanobts.features.data_len = sizeof(model_nanobts._features_data);
@@ -445,5 +449,11 @@
 
 	osmo_signal_register_handler(SS_NM, nm_sig_cb, NULL);
 
+	/* Call A-bis input driver, start server sockets for OML and RSL. */
+	return ipaccess_setup(net);
+}
+
+int bts_model_nanobts_init(void)
+{
 	return gsm_bts_model_register(&model_nanobts);
 }
diff --git a/openbsc/src/libbsc/bts_siemens_bs11.c b/openbsc/src/libbsc/bts_siemens_bs11.c
index 44f9358..df4a1dc 100644
--- a/openbsc/src/libbsc/bts_siemens_bs11.c
+++ b/openbsc/src/libbsc/bts_siemens_bs11.c
@@ -28,9 +28,12 @@
 #include <openbsc/e1_input.h>
 #include <openbsc/signal.h>
 
+static int bts_model_bs11_start(struct gsm_network *net);
+
 static struct gsm_bts_model model_bs11 = {
 	.type = GSM_BTS_TYPE_BS11,
 	.name = "bs11",
+	.start = bts_model_bs11_start,
 	.oml_rcvmsg = &abis_nm_rcvmsg,
 	.nm_att_tlvdef = {
 		.def = {
@@ -575,7 +578,7 @@
 	return 0;
 }
 
-int bts_model_bs11_init(void)
+static int bts_model_bs11_start(struct gsm_network *net)
 {
 	model_bs11.features.data = &model_bs11._features_data[0];
 	model_bs11.features.data_len = sizeof(model_bs11._features_data);
@@ -586,5 +589,10 @@
 	osmo_signal_register_handler(SS_INPUT, inp_sig_cb, NULL);
 	osmo_signal_register_handler(SS_GLOBAL, gbl_sig_cb, NULL);
 
+	return 0;
+}
+
+int bts_model_bs11_init(void)
+{
 	return gsm_bts_model_register(&model_bs11);
 }
diff --git a/openbsc/src/libcommon/gsm_data.c b/openbsc/src/libcommon/gsm_data.c
index 45e56af..480eb80 100644
--- a/openbsc/src/libcommon/gsm_data.c
+++ b/openbsc/src/libcommon/gsm_data.c
@@ -573,6 +573,14 @@
 	bts->type = type;
 	bts->model = model;
 
+	if (model->start && !model->started) {
+		int ret = model->start(bts->network);
+		if (ret < 0)
+			return ret;
+
+		model->started = true;
+	}
+
 	switch (bts->type) {
 	case GSM_BTS_TYPE_HSL_FEMTO:
 		bts->c0->rsl_tei = 0;
diff --git a/openbsc/src/osmo-bsc/osmo_bsc_main.c b/openbsc/src/osmo-bsc/osmo_bsc_main.c
index 16495d8..42c74cc 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_main.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_main.c
@@ -50,8 +50,6 @@
 extern const char *openbsc_copyright;
 static int daemonize = 0;
 
-extern int bsc_bootstrap_network(int (*layer4)(struct gsm_network *, struct msgb *), const char *cfg_file);
-
 static void print_usage()
 {
 	printf("Usage: osmo-bsc\n");
@@ -128,10 +126,6 @@
 	}
 }
 
-extern int bts_model_unknown_init(void);
-extern int bts_model_bs11_init(void);
-extern int bts_model_nanobts_init(void);
-
 extern enum node_type bsc_vty_go_parent(struct vty *vty);
 
 static struct vty_app_info vty_info = {
@@ -183,9 +177,8 @@
 
 	osmo_init_logging(&log_info);
 
-	bts_model_unknown_init();
-	bts_model_bs11_init();
-	bts_model_nanobts_init();
+	bts_init();
+	e1inp_init();
 
 	/* enable filters */
 
diff --git a/openbsc/src/osmo-nitb/bsc_hack.c b/openbsc/src/osmo-nitb/bsc_hack.c
index 1fa039b..2406873 100644
--- a/openbsc/src/osmo-nitb/bsc_hack.c
+++ b/openbsc/src/osmo-nitb/bsc_hack.c
@@ -40,6 +40,7 @@
 #include <openbsc/osmo_msc.h>
 #include <openbsc/sms_queue.h>
 #include <openbsc/vty.h>
+#include <openbsc/bss.h>
 
 #include "../../bscconfig.h"
 
@@ -55,10 +56,6 @@
 #define DB_SYNC_INTERVAL	60, 0
 static struct osmo_timer_list db_sync_timer;
 
-extern int bsc_bootstrap_network(int (*mncc_recv)(struct gsm_network *, struct msgb *),
-				 const char *cfg_file);
-extern int bsc_shutdown_net(struct gsm_network *net);
-
 static void create_pcap_file(char *file)
 {
 	mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
@@ -207,11 +204,6 @@
 	osmo_timer_schedule(&db_sync_timer, DB_SYNC_INTERVAL);
 }
 
-extern int bts_model_unknown_init(void);
-extern int bts_model_bs11_init(void);
-extern int bts_model_nanobts_init(void);
-extern int bts_model_rbs2k_init(void);
-extern int bts_model_hslfemto_init(void);
 void talloc_ctx_init(void);
 
 extern enum node_type bsc_vty_go_parent(struct vty *vty);
@@ -237,12 +229,7 @@
 
 	osmo_init_logging(&log_info);
 
-	bts_model_unknown_init();
-	bts_model_bs11_init();
-	bts_model_nanobts_init();
-	bts_model_rbs2k_init();
-	bts_model_hslfemto_init();
-
+	bts_init();
 	e1inp_init();
 
 	/* This needs to precede handle_options() */