You haven’t understood the callsign, ask the pilot to say it again. Begin with the words ‘Station calling’. Practise the exercise several times.
Example: ACFT: Newtown Control, Air India 116.
ACC: Station calling Newtown Control, say again your callsign.
ACFT: Newtown Control, Air India 116.
ACC: Air India 116, Newtown Control, go ahead.
1) ACFT: Newtown Control, Air France 503.
ACC: . . . . . . . . . . . . . . . .
ACFT: Newtown Control, Air France 503.
ACC: . . . . . . . . . . . . . . . .
2) ACFT: Newtown Approach, Alitalia 548.
APP: . . . . . . . . . . . . . . . .
ACFT: Newtown Approach, Alitalia 548.
APP: . . . . . . . . . . . . . . . .
3) ACFT: Newtown Radar, Cubana 1472.
RADAR: . . . . . . . . . . . . . . . .
ACFT: Newtown Radar, Cubana 1472.
RADAR: . . . . . . . . . . . . . . . .
4) ACFT: Newtown Radar, Delta 774.
RADAR: . . . . . . . . . . . . . . . .
ACFT: Newtown Radar, Delta 774.
RADAR: . . . . . . . . . . . . . . . .
5) ACFT: Newtown Tower, Thainter 914.
GROUND: . . . . . . . . . . . . . . . .
ACFT: Newtown Tower, Thainter 914.
GROUND: . . . . . . . . . . . . . . . .