diff --git a/include/osmocom/mgcp/mgcp.h b/include/osmocom/mgcp/mgcp.h
index 5886a65..71d6342 100644
--- a/include/osmocom/mgcp/mgcp.h
+++ b/include/osmocom/mgcp/mgcp.h
@@ -81,10 +81,11 @@
 				     struct mgcp_conn_rtp *conn_dst,
 				     struct mgcp_conn_rtp *conn_src);
 
+struct mgcp_rtp_codec;
+
 typedef void (*mgcp_get_format)(struct mgcp_endpoint *endp,
-				int *payload_type,
-				const char**subtype_name,
-				const char**fmtp_extra,
+				const struct mgcp_rtp_codec **codec,
+				const char **fmtp_extra,
 				struct mgcp_conn_rtp *conn);
 
 /**
diff --git a/include/osmocom/mgcp/mgcp_internal.h b/include/osmocom/mgcp/mgcp_internal.h
index a6239c2..35b535a 100644
--- a/include/osmocom/mgcp/mgcp_internal.h
+++ b/include/osmocom/mgcp/mgcp_internal.h
@@ -298,9 +298,8 @@
 				      struct mgcp_conn_rtp *conn_src);
 
 void mgcp_get_net_downlink_format_default(struct mgcp_endpoint *endp,
-					  int *payload_type,
-					  const char**audio_name,
-					  const char**fmtp_extra,
+					  const struct mgcp_rtp_codec **codec,
+					  const char **fmtp_extra,
 					  struct mgcp_conn_rtp *conn);
 
 /* internal RTP Annex A counting */