diff --git a/include/openbsc/trau_mux.h b/include/openbsc/trau_mux.h
index f3d519f..90535ad 100644
--- a/include/openbsc/trau_mux.h
+++ b/include/openbsc/trau_mux.h
@@ -36,8 +36,14 @@
 			const struct gsm_lchan *dst);
 
 /* unmap a TRAU mux map entry */
-int trau_mux_unmap(const struct gsm_e1_subslot *ss);
+int trau_mux_unmap(const struct gsm_e1_subslot *ss, u_int32_t callref);
 
 /* we get called by subchan_demux */
 int trau_mux_input(struct gsm_e1_subslot *src_e1_ss,
 		   const u_int8_t *trau_bits, int num_bits);
+
+/* add a trau receiver */
+int trau_recv_lchan(struct gsm_lchan *lchan, u_int32_t callref);
+
+/* send trau from application */
+int trau_send_lchan(struct gsm_lchan *lchan, struct decoded_trau_frame *tf);