diff --git a/src/host/layer23/include/osmocom/gsm48_rr.h b/src/host/layer23/include/osmocom/gsm48_rr.h
index c2907030a..74ccb27ab 100644
--- a/src/host/layer23/include/osmocom/gsm48_rr.h
+++ b/src/host/layer23/include/osmocom/gsm48_rr.h
@@ -161,6 +161,7 @@ int gsm48_decode_lai(struct gsm48_loc_area_id *lai, uint16_t *mcc,
 int gsm48_rr_enc_cm2(struct osmocom_ms *ms, struct gsm48_classmark2 *cm);
 int gsm48_rr_tx_rand_acc(struct osmocom_ms *ms, struct msgb *msg);
 int gsm48_rr_los(struct osmocom_ms *ms);
+int gsm48_rr_rach_conf(struct osmocom_ms *ms, uint32_t fn);
 extern const char *gsm48_rr_state_names[];
 
 #endif /* _GSM48_RR_H */
diff --git a/src/host/layer23/include/osmocom/l1ctl.h b/src/host/layer23/include/osmocom/l1ctl.h
index 427f27e83..ad59b2d43 100644
--- a/src/host/layer23/include/osmocom/l1ctl.h
+++ b/src/host/layer23/include/osmocom/l1ctl.h
@@ -17,8 +17,12 @@ int tx_ph_data_req(struct osmocom_ms *ms, struct msgb *msg,
 int tx_ph_rach_req(struct osmocom_ms *ms);
 
 /* Transmit L1CTL_DM_EST_REQ */
-int tx_ph_dm_est_req(struct osmocom_ms *ms, uint16_t band_arfcn, uint8_t chan_nr,
-		     uint8_t tsc);
+int tx_ph_dm_est_req(struct osmocom_ms *ms, uint16_t band_arfcn,
+		     uint8_t chan_nr, uint8_t tsc);
+
+/* Transmit L1CTL_DM_REL_REQ */
+int tx_ph_dm_rel_req(struct osmocom_ms *ms);
+
 /* Transmit FBSB_REQ */
 int l1ctl_tx_fbsb_req(struct osmocom_ms *ms, uint16_t arfcn,
 		      uint8_t flags, uint16_t timeout, uint8_t sync_info_idx,
diff --git a/src/host/layer23/src/gsm322.c b/src/host/layer23/src/gsm322.c
index 11ff50642..8c51d0136 100644
--- a/src/host/layer23/src/gsm322.c
+++ b/src/host/layer23/src/gsm322.c
@@ -2309,8 +2309,8 @@ static int gsm322_cs_powerscan(struct osmocom_ms *ms)
 
 	/* start scan on radio interface */
 	cs->powerscan = 1;
-#warning TESTING!!!!
-usleep(300000);
+//#warning TESTING!!!!
+//usleep(300000);
 	return l1ctl_tx_pm_req_range(ms, s, e);
 }
 
@@ -2833,8 +2833,8 @@ static int gsm322_c_conn_mode_1(struct osmocom_ms *ms, struct msgb *msg)
 	hack = 5;
 	gsm322_sync_to_cell(ms, cs);
 	cs->si = cs->list[cs->arfcn].sysinfo;
-#warning TESTING: laforge must fix the sync error when sending fbsb request too close to each other. also we must get a response with arfcn or a confirm, so we know where the response belongs to.
-usleep(300000);
+//#warning TESTING!!!!
+//usleep(300000);
 
 	return 0;
 }
diff --git a/src/host/layer23/src/gsm48_rr.c b/src/host/layer23/src/gsm48_rr.c
index de087ced7..415adc425 100644
--- a/src/host/layer23/src/gsm48_rr.c
+++ b/src/host/layer23/src/gsm48_rr.c
@@ -58,6 +58,7 @@
 #include <osmocom/l1l2_interface.h>
 #include <osmocom/logging.h>
 #include <osmocom/networks.h>
+#include <osmocom/l1ctl.h>
 
 static int gsm48_rcv_rsl(struct osmocom_ms *ms, struct msgb *msg);
 static int gsm48_rr_dl_est(struct osmocom_ms *ms);
@@ -213,6 +214,8 @@ static void new_rr_state(struct gsm48_rrlayer *rr, int state)
 	if (state == GSM48_RR_ST_IDLE) {
 		struct msgb *msg, *nmsg;
 
+		/* release dedicated mode, if any */
+		tx_ph_dm_rel_req(rr->ms);
 		/* free establish message, if any */
 		rr->rr_est_req = 0;
 		if (rr->rr_est_msg) {
@@ -3003,9 +3006,15 @@ static int gsm48_rr_dl_est(struct osmocom_ms *ms)
 #ifdef TODO
 	RSL_MT_ to activate channel with all the cd_now informations
 #else
+	if (rr->cd_now.h) {
+		printf("FIXME: Channel hopping not supported, exitting.\n");
+		exit(-ENOTSUP);
+	}
 	rsl_dec_chan_nr(rr->cd_now.chan_nr, &ch_type, &ch_subch, &ch_ts);
-	if (ch_type != RSL_CHAN_SDCCH4_ACCH || ch_ts != 0) {
-		printf("Channel type not supported, exitting.\n");
+	if ((ch_type != RSL_CHAN_SDCCH8_ACCH
+	  && ch_type != RSL_CHAN_SDCCH4_ACCH) || ch_ts > 4) {
+		printf("Channel type %d, subch %d, ts %d not supported, "
+			"exitting.\n", ch_type, ch_subch, ch_ts);
 		exit(-ENOTSUP);
 	}
 	tx_ph_dm_est_req(ms, rr->cd_now.arfcn, rr->cd_now.chan_nr,
diff --git a/src/host/layer23/src/l1ctl.c b/src/host/layer23/src/l1ctl.c
index 5b86dfedd..6e5920440 100644
--- a/src/host/layer23/src/l1ctl.c
+++ b/src/host/layer23/src/l1ctl.c
@@ -343,6 +343,23 @@ int tx_ph_dm_est_req(struct osmocom_ms *ms, uint16_t band_arfcn, uint8_t chan_nr
 	return osmo_send_l1(ms, msg);
 }
 
+/* Transmit L1CTL_DM_REL_REQ */
+int tx_ph_dm_rel_req(struct osmocom_ms *ms)
+{
+	struct msgb *msg;
+	struct l1ctl_info_ul *ul;
+
+	msg = osmo_l1_alloc(L1CTL_DM_REL_REQ);
+	if (!msg)
+		return -1;
+
+	DEBUGP(DL1C, "Tx Dedic.Mode Rel Req\n");
+
+	ul = (struct l1ctl_info_ul *) msgb_put(msg, sizeof(*ul));
+
+	return osmo_send_l1(ms, msg);
+}
+
 int l1ctl_tx_echo_req(struct osmocom_ms *ms, unsigned int len)
 {
 	struct msgb *msg;
diff --git a/src/target/firmware/layer1/l23_api.c b/src/target/firmware/layer1/l23_api.c
index 16f896947..70776fcc7 100644
--- a/src/target/firmware/layer1/l23_api.c
+++ b/src/target/firmware/layer1/l23_api.c
@@ -171,9 +171,9 @@ static void l1ctl_rx_dm_est_req(struct msgb *msg)
 		puts("We don't support ARFCN switches yet\n");
 		return;
 	}
-	if (ul->chan_nr & 0x7) {
+	if ((ul->chan_nr & 0x7) > 4) {
 		/* FIXME: Timeslot */
-		puts("We don't support non-0 TS yet\n");
+		puts("We don't support TS > 4 yet\n");
 		return;
 	}
 	if (est_req->h) {