diff --git a/openbsc/include/openbsc/gsm_data_shared.h b/openbsc/include/openbsc/gsm_data_shared.h
index 63978e6..5e5e389 100644
--- a/openbsc/include/openbsc/gsm_data_shared.h
+++ b/openbsc/include/openbsc/gsm_data_shared.h
@@ -135,6 +135,17 @@
 	/* RSSI in dBm * -1 */
 	uint8_t inv_rssi;
 };
+
+struct amr_mode {
+	uint8_t mode;
+	uint8_t threshold;
+	uint8_t hysteresis;
+};
+struct amr_multirate_conf {
+	uint8_t gsm48_ie[2];
+	struct amr_mode mode[4];
+	uint8_t num_modes;
+};
 /* /BTS ONLY */
 
 struct gsm_lchan {
@@ -231,6 +242,9 @@
 			uint8_t rxqual_sub;
 		} res;
 	} meas;
+	struct {
+		struct amr_multirate_conf amr_mr;
+	} tch;
 #endif
 };