diff --git a/TODO-RELEASE b/TODO-RELEASE
index 746808e53..e8029f947 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -24,4 +24,4 @@
 # If any interfaces have been removed or changed since the last public release, a=0.
 #
 #library		what		description / commit summary line
-libosmo-netif           >1.2.0          OSMUX_DEFAULT_PORT
+libosmo-netif           >1.2.0          OSMUX_DEFAULT_PORT, osmux_xfrm_output_alloc, osmux_xfrm_output_set_rtp_*
diff --git a/include/osmocom/mgcp/mgcp_conn.h b/include/osmocom/mgcp/mgcp_conn.h
index 7338027ec..a08c0897d 100644
--- a/include/osmocom/mgcp/mgcp_conn.h
+++ b/include/osmocom/mgcp/mgcp_conn.h
@@ -84,10 +84,10 @@ struct mgcp_conn_rtp {
 		bool cid_allocated;
 		/* Allocated Osmux circuit ID for this conn */
 		uint8_t cid;
-		/* handle to batch messages */
+		/* handle to batch messages, shared (refcounted) among several conns */
 		struct osmux_in_handle *in;
-		/* handle to unbatch messages */
-		struct osmux_out_handle out;
+		/* handle to unbatch messages, one allocated and owned per conn */
+		struct osmux_out_handle *out;
 		/* statistics */
 		struct {
 			uint32_t chunks;
diff --git a/src/libosmo-mgcp/mgcp_osmux.c b/src/libosmo-mgcp/mgcp_osmux.c
index abc3f0eb4..5ce850da7 100644
--- a/src/libosmo-mgcp/mgcp_osmux.c
+++ b/src/libosmo-mgcp/mgcp_osmux.c
@@ -403,7 +403,7 @@ static int osmux_read_fd_cb(struct osmo_fd *ofd, unsigned int what)
 		if (endp_osmux_state_check(conn_src->conn->endp, conn_src, false) == 0) {
 			conn_src->osmux.stats.octets += osmux_chunk_length(msg, rem);
 			conn_src->osmux.stats.chunks++;
-			osmux_xfrm_output_sched(&conn_src->osmux.out, osmuxh);
+			osmux_xfrm_output_sched(conn_src->osmux.out, osmuxh);
 		}
 		rem = msg->len;
 	}
@@ -494,12 +494,12 @@ int osmux_enable_conn(struct mgcp_endpoint *endp, struct mgcp_conn_rtp *conn,
 		return -1;
 	}
 
-	osmux_xfrm_output_init2(&conn->osmux.out,
-			       (conn->osmux.cid * rtp_ssrc_winlen) +
-			        (random() % rtp_ssrc_winlen),
-			       conn->end.codec->payload_type);
-
-	osmux_xfrm_output_set_tx_cb(&conn->osmux.out,
+	conn->osmux.out = osmux_xfrm_output_alloc(osmux);
+	osmux_xfrm_output_set_rtp_ssrc(conn->osmux.out,
+				       (conn->osmux.cid * rtp_ssrc_winlen) +
+				       (random() % rtp_ssrc_winlen));
+	osmux_xfrm_output_set_rtp_pl_type(conn->osmux.out, conn->end.codec->payload_type);
+	osmux_xfrm_output_set_tx_cb(conn->osmux.out,
 				    scheduled_from_osmux_tx_rtp_cb, conn);
 
 	conn->osmux.state = OSMUX_STATE_ENABLED;
@@ -519,8 +519,8 @@ void conn_osmux_disable(struct mgcp_conn_rtp *conn)
 
 	if (conn->osmux.state == OSMUX_STATE_ENABLED) {
 		/* We are closing, we don't need pending RTP packets to be transmitted */
-		osmux_xfrm_output_set_tx_cb(&conn->osmux.out, NULL, NULL);
-		osmux_xfrm_output_flush(&conn->osmux.out);
+		osmux_xfrm_output_set_tx_cb(conn->osmux.out, NULL, NULL);
+		TALLOC_FREE(conn->osmux.out);
 
 		osmux_xfrm_input_close_circuit(conn->osmux.in, conn->osmux.cid);
 		conn->osmux.state = OSMUX_STATE_DISABLED;