As for TCAS the correct phraseology according to PANS-ATM (Procedures for Air Navigation Services, ICAO Doc. 4444 Fifteenth Edidtion 2007-ATM/501) states the following:
Circumstances:
... after a flight crew starts to deviate from any ATC clearance or instruction to comply with an ACAS resolution advisory (RA) (Pilot and controller interchange):
PILOT: [callsign] TCAS RA;
ATC: [callsign] ROGER;
... after the response to an ACAS RA is completed and a return to the ATC clearance or instruction is initiated (Pilot and controller interchange):
PILOT: [callsign] CLEAR OF CONFLICT, RETURNING TO (assigned clearance);
ATC: [callsign] ROGER (or alternative instructions);
… after the response to an ACAS RA is completed and the assigned ATC clearance or instruction has been resumed (Pilot and controller interchange):
PILOT: [callsign] CLEAR OF CONFLICT (assigned clearance) RESUMED;
ATC: [callsign] ROGER (or alternative instructions);
… after an ATC clearance or instruction contradictory to the ACAS RA is received, the flight crew will follow the RA and inform ATC directly (Pilot and controller interchange):
PILOT: [callsign] UNABLE, TCAS RA;
ATC: [callsign] ROGER;
That excerpt is copied from the
Eurocontrol ACAS Site.