diff --git a/TODO-RELEASE b/TODO-RELEASE
index 3af993e..128778a 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -1,3 +1,4 @@
 #library	what		description / commit summary line
 libosmo-abis	API change	major: add parameter to rx_cb() callack in osmo_ortp.h
 libosmo-abis	API change	major: add parameter to struct input_signal_data
+libosmo-abis	API change	major: add parameters 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 1c0b223..9eb176f 100644
--- a/include/osmocom/trau/osmo_ortp.h
+++ b/include/osmocom/trau/osmo_ortp.h
@@ -55,7 +55,8 @@
 
 	/*! \brief callback for incoming data */
 	void (*rx_cb)(struct osmo_rtp_socket *rs, const uint8_t *payload,
-		      unsigned int payload_len, bool marker);
+		      unsigned int payload_len, uint16_t seq_number,
+		      uint32_t timestamp, 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 e3c6234..e990487 100644
--- a/src/trau/osmo_ortp.c
+++ b/src/trau/osmo_ortp.c
@@ -161,6 +161,8 @@
 		if (rs->rx_cb)
 			rs->rx_cb(rs, mblk->b_rptr,
 				  mblk->b_wptr - mblk->b_rptr,
+				  rtp_get_seqnumber(mblk),
+				  rtp_get_timestamp(mblk),
 				  rtp_get_markbit(mblk));
 		//rs->rx_user_ts += 160;
 		freemsg(mblk);
@@ -192,6 +194,8 @@
 			if (rs->rx_cb)
 				rs->rx_cb(rs, mblk->b_rptr,
 					  mblk->b_wptr - mblk->b_rptr,
+					  rtp_get_seqnumber(mblk),
+					  rtp_get_timestamp(mblk),
 					  rtp_get_markbit(mblk));
 			freemsg(mblk);
 		} else