mgcp: Assume that on a MDCX all data is present...

Send a dummy packet on each MDCX message. This assumes
that the remote address is available by then and this
should fix not hearing the ringtone as the NAT didn't
know to which port to forward the data.
diff --git a/src/mgcp_ss7.c b/src/mgcp_ss7.c
index 015c14c..e0e61e3 100644
--- a/src/mgcp_ss7.c
+++ b/src/mgcp_ss7.c
@@ -433,12 +433,9 @@
 	mgcp_ss7_exec(ss7, MGCP_SS7_MUTE_STATUS, endp_no, mg_endp->conn_mode);
 
 	/*
-	 * this is a bad assumption of the network. We assume
-	 * to have the remote addr now.
+	 * Just assume that we have the data now.
 	 */
-	if (mg_endp->conn_mode == MGCP_CONN_SEND_ONLY ||
-	    mg_endp->conn_mode == MGCP_CONN_RECV_SEND)
-		mgcp_send_dummy(mg_endp);
+	mgcp_send_dummy(mg_endp);
 
 	/* update the remote end */
 	return MGCP_POLICY_CONT;