diff --git a/openbsc/include/openbsc/abis_rsl.h b/openbsc/include/openbsc/abis_rsl.h
index b280184..e6973ee 100644
--- a/openbsc/include/openbsc/abis_rsl.h
+++ b/openbsc/include/openbsc/abis_rsl.h
@@ -59,7 +59,7 @@
 int rsl_ipacc_mdcx(struct gsm_lchan *lchan, u_int32_t ip,
 		   u_int16_t port, u_int8_t rtp_payload2);
 int rsl_ipacc_mdcx_to_rtpsock(struct gsm_lchan *lchan);
-int rsl_ipacc_pdch_activate(struct gsm_lchan *lchan);
+int rsl_ipacc_pdch_activate(struct gsm_lchan *lchan, int act);
 
 int abis_rsl_rcvmsg(struct msgb *msg);
 
diff --git a/openbsc/include/openbsc/gsm_data.h b/openbsc/include/openbsc/gsm_data.h
index f352711..8dfa588 100644
--- a/openbsc/include/openbsc/gsm_data.h
+++ b/openbsc/include/openbsc/gsm_data.h
@@ -267,7 +267,7 @@
 	u_int8_t	e1_ts_ss;
 };
 
-#define BTS_TRX_F_ACTIVATED	0x0001
+#define TS_F_PDCH_MODE	0x1000
 /* One Timeslot in a TRX */
 struct gsm_bts_trx_ts {
 	struct gsm_bts_trx *trx;
diff --git a/openbsc/src/abis_rsl.c b/openbsc/src/abis_rsl.c
index 3e0c014..0db2fab 100644
--- a/openbsc/src/abis_rsl.c
+++ b/openbsc/src/abis_rsl.c
@@ -992,12 +992,14 @@
 		break;
 	case RSL_MT_IPAC_PDCH_ACT_ACK:
 		DEBUGPC(DRSL, "%s IPAC PDCH ACT ACK\n", ts_name);
+		msg->lchan->ts->flags |= TS_F_PDCH_MODE;
 		break;
 	case RSL_MT_IPAC_PDCH_ACT_NACK:
 		LOGP(DRSL, LOGL_ERROR, "%s IPAC PDCH ACT NACK\n", ts_name);
 		break;
 	case RSL_MT_IPAC_PDCH_DEACT_ACK:
 		DEBUGP(DRSL, "%s IPAC PDCH DEACT ACK\n", ts_name);
+		msg->lchan->ts->flags &= ~TS_F_PDCH_MODE;
 		break;
 	case RSL_MT_IPAC_PDCH_DEACT_NACK:
 		LOGP(DRSL, LOGL_ERROR, "%s IPAC PDCH DEACT NACK\n", ts_name);
@@ -1491,17 +1493,24 @@
 	return rc;
 }
 
-int rsl_ipacc_pdch_activate(struct gsm_lchan *lchan)
+int rsl_ipacc_pdch_activate(struct gsm_lchan *lchan, int act)
 {
 	struct msgb *msg = rsl_msgb_alloc();
 	struct abis_rsl_dchan_hdr *dh;
+	u_int8_t msg_type;
+
+	if (act)
+		msg_type = RSL_MT_IPAC_PDCH_ACT;
+	else
+		msg_type = RSL_MT_IPAC_PDCH_DEACT;
 
 	dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh));
-	init_dchan_hdr(dh, RSL_MT_IPAC_PDCH_ACT);
+	init_dchan_hdr(dh, msg_type);
 	dh->c.msg_discr = ABIS_RSL_MDISC_DED_CHAN;
 	dh->chan_nr = lchan2chan_nr(lchan);
 
-	DEBUGP(DRSL, "%s IPAC_PDCH_ACT\n", gsm_lchan_name(lchan));
+	DEBUGP(DRSL, "%s IPAC_PDCH_%sACT\n", gsm_lchan_name(lchan),
+		act ? "" : "DE");
 
 	msg->trx = lchan->ts->trx;