diff --git a/include/osmocom/mgcp_client/mgcp_client.h b/include/osmocom/mgcp_client/mgcp_client.h
index 19abaf3..cf5e8c4 100644
--- a/include/osmocom/mgcp_client/mgcp_client.h
+++ b/include/osmocom/mgcp_client/mgcp_client.h
@@ -21,6 +21,7 @@
 	int remote_port;
 	uint16_t first_endpoint;
 	uint16_t last_endpoint;
+	uint16_t bts_base;
 };
 
 typedef unsigned int mgcp_trans_id_t;