diff --git a/TODO-RELEASE b/TODO-RELEASE
index 43b1e8e..7ea65b6 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -1 +1,2 @@
 #library	what		description / commit summary line
+libosmo-abis	API change	major: add parameter to rx_cb() callack in osmo_ortp.h
diff --git a/include/osmocom/trau/osmo_ortp.h b/include/osmocom/trau/osmo_ortp.h
index 7c2a5cb..1c0b223 100644
--- a/include/osmocom/trau/osmo_ortp.h
+++ b/include/osmocom/trau/osmo_ortp.h
@@ -55,7 +55,7 @@
 
 	/*! \brief callback for incoming data */
 	void (*rx_cb)(struct osmo_rtp_socket *rs, const uint8_t *payload,
-		      unsigned int payload_len);
+		      unsigned int payload_len, bool marker);
 
 	/*! \brief Receive user timestamp, to be incremented by user */
 	uint32_t rx_user_ts;
diff --git a/src/trau/osmo_ortp.c b/src/trau/osmo_ortp.c
index cdcc1e7..cc1d748 100644
--- a/src/trau/osmo_ortp.c
+++ b/src/trau/osmo_ortp.c
@@ -159,7 +159,8 @@
 		/* hand into receiver */
 		if (rs->rx_cb)
 			rs->rx_cb(rs, mblk->b_rptr,
-				  mblk->b_wptr - mblk->b_rptr);
+				  mblk->b_wptr - mblk->b_rptr,
+				  rtp_get_markbit(mblk));
 		//rs->rx_user_ts += 160;
 		freemsg(mblk);
 		return 1;
@@ -189,7 +190,8 @@
 			/* hand into receiver */
 			if (rs->rx_cb)
 				rs->rx_cb(rs, mblk->b_rptr,
-					  mblk->b_wptr - mblk->b_rptr);
+					  mblk->b_wptr - mblk->b_rptr,
+					  rtp_get_markbit(mblk));
 			freemsg(mblk);
 		} else
 			LOGP(DLMIB, LOGL_INFO, "recvm_with_ts(%u): ERROR!\n",