Regarding my post, it is consistent with Doc 4444 Ch 8 ATS Surveillance Services. Note: ICAO changed the references from Radar to Surveillance some years ago.
Identification - 8.6 Surveillance System procedures -> 8.6.2.1.1 "Before providing an ATS surveillance service to an aircraft, identification shall be established and the pilot informed." So that means "ABC123 IDENTIFIED".
Yes - and no! ICAO states the phrases RADAR CONTACT as well as IDENTIFIED. Under Termination of Service, there is a sort of implication that the latter term is relevant to ADS-B, but that "radar" is still appropriate for the specific use of radar.
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