diff --git a/openbsc/include/openbsc/abis_rsl.h b/openbsc/include/openbsc/abis_rsl.h
index 06f0a72..0f188ee 100644
--- a/openbsc/include/openbsc/abis_rsl.h
+++ b/openbsc/include/openbsc/abis_rsl.h
@@ -43,7 +43,7 @@
 		      uint8_t bs_power, uint8_t ms_power,
 		      uint8_t ta);
 int rsl_chan_activate_lchan(struct gsm_lchan *lchan, uint8_t act_type,
-			    uint8_t ta, uint8_t ho_ref);
+			    uint8_t ho_ref);
 int rsl_chan_mode_modify_req(struct gsm_lchan *ts);
 int rsl_encryption_cmd(struct msgb *msg);
 int rsl_paging_cmd(struct gsm_bts *bts, uint8_t paging_group, uint8_t len,
diff --git a/openbsc/src/libbsc/abis_rsl.c b/openbsc/src/libbsc/abis_rsl.c
index d193078..d9fe92c 100644
--- a/openbsc/src/libbsc/abis_rsl.c
+++ b/openbsc/src/libbsc/abis_rsl.c
@@ -476,12 +476,13 @@
 #endif
 
 int rsl_chan_activate_lchan(struct gsm_lchan *lchan, uint8_t act_type,
-			    uint8_t ta, uint8_t ho_ref)
+			    uint8_t ho_ref)
 {
 	struct abis_rsl_dchan_hdr *dh;
 	struct msgb *msg;
 	int rc;
 	uint8_t *len;
+	uint8_t ta;
 
 	uint8_t chan_nr = gsm_lchan2chan_nr(lchan);
 	struct rsl_ie_chan_mode cm;
@@ -491,6 +492,12 @@
 	if (rc < 0)
 		return rc;
 
+	ta = lchan->rqd_ta;
+
+	/* BS11 requires TA shifted by 2 bits */
+	if (lchan->ts->trx->bts->type == GSM_BTS_TYPE_BS11)
+		ta <<= 2;
+
 	memset(&cd, 0, sizeof(cd));
 	gsm48_lchan2chan_desc(&cd, lchan);
 
@@ -1469,10 +1476,7 @@
 		gsm_lchant_name(lchan->type), gsm_chreq_name(chreq_reason),
 		rqd_ref->ra, rqd_ta);
 
-	/* BS11 requires TA shifted by 2 bits */
-	if (bts->type == GSM_BTS_TYPE_BS11)
-		rqd_ta <<= 2;
-	rsl_chan_activate_lchan(lchan, 0x00, rqd_ta, 0);
+	rsl_chan_activate_lchan(lchan, 0x00, 0);
 
 	return 0;
 }
diff --git a/openbsc/src/libbsc/bsc_api.c b/openbsc/src/libbsc/bsc_api.c
index e567038..04a4619 100644
--- a/openbsc/src/libbsc/bsc_api.c
+++ b/openbsc/src/libbsc/bsc_api.c
@@ -200,6 +200,7 @@
 	memcpy(&new_lchan->encr, &conn->lchan->encr, sizeof(new_lchan->encr));
 	new_lchan->ms_power = conn->lchan->ms_power;
 	new_lchan->bs_power = conn->lchan->bs_power;
+	new_lchan->rqd_ta = conn->lchan->rqd_ta;
 
 	/* copy new data to it */
 	new_lchan->tch_mode = chan_mode;
@@ -209,7 +210,7 @@
 	if (chan_mode == GSM48_CMODE_SPEECH_AMR)
 		handle_mr_config(conn, new_lchan);
 
-	if (rsl_chan_activate_lchan(new_lchan, 0x1, 0, 0) < 0) {
+	if (rsl_chan_activate_lchan(new_lchan, 0x1, 0) < 0) {
 		LOGP(DHO, LOGL_ERROR, "could not activate channel\n");
 		lchan_free(new_lchan);
 		return -1;
diff --git a/openbsc/src/libbsc/handover_logic.c b/openbsc/src/libbsc/handover_logic.c
index 36a758b..22f9883 100644
--- a/openbsc/src/libbsc/handover_logic.c
+++ b/openbsc/src/libbsc/handover_logic.c
@@ -131,8 +131,7 @@
 	new_lchan->conn->ho_lchan = new_lchan;
 
 	/* FIXME: do we have a better idea of the timing advance? */
-	rc = rsl_chan_activate_lchan(new_lchan, RSL_ACT_INTER_ASYNC, 0,
-				     ho->ho_ref);
+	rc = rsl_chan_activate_lchan(new_lchan, RSL_ACT_INTER_ASYNC, ho->ho_ref);
 	if (rc < 0) {
 		LOGP(DHO, LOGL_ERROR, "could not activate channel\n");
 		new_lchan->conn->ho_lchan = NULL;