diff --git a/openbsc/src/mgcp/mgcp_network.c b/openbsc/src/mgcp/mgcp_network.c
index c864723..d38542c 100644
--- a/openbsc/src/mgcp/mgcp_network.c
+++ b/openbsc/src/mgcp/mgcp_network.c
@@ -281,7 +281,7 @@
 	if (rc <= 0)
 		return -1;
 
-	proto = &endp->bts_end.rtp ? PROTO_RTP : PROTO_RTCP;
+	proto = fd == &endp->bts_end.rtp ? PROTO_RTP : PROTO_RTCP;
 
 	/* We have no idea who called us, maybe it is the BTS. */
 	/* it was the BTS... */