Two years after mid air collision there is no ICAO stipulated procedure for "automatic" notifications of RAs. Leaving those notifications at the expense of many circumstances, as happened in this tragedy.
It will be advisable to establish a procedure that unerringly notifies to ATCOs the fact that tCAS is issuing RA command to the crew.The quickest way would be to send a predetermined sqwack on the transponder.
Any delay on RA notification could have fatal consecuences.