diff --git a/src/libosmo-mgcp/mgcp_network.c b/src/libosmo-mgcp/mgcp_network.c
index 6edb4ae..3248cbd 100644
--- a/src/libosmo-mgcp/mgcp_network.c
+++ b/src/libosmo-mgcp/mgcp_network.c
@@ -1020,7 +1020,7 @@
 		LOGPENDP(endp, DRTP, LOGL_DEBUG,
 			 "endpoint type is MGCP_RTP_OSMUX, "
 			 "using osmux_xfrm_to_osmux() to forward data through OSMUX\n");
-		return osmux_xfrm_to_osmux((char*)msgb_data(msg), msgb_length(msg), conn_dst);
+		return conn_osmux_send_rtp(conn_dst, msg);
 	case MGCP_RTP_IUUP:
 		if (proto == MGCP_PROTO_RTP) {
 			LOGPENDP(endp, DRTP, LOGL_DEBUG,