Can you have an alarm system that has a panel and no call points ,it’s block of flats and each flat has its on hyfire detector there are detector heads and smoke vents.

Most purpose built flats just need detectors to corridors and stairs to open smoke vents with no call points or sounders. Where the fire strategy leans more to evacuation you would expect sounders & detection in addition, both in the common areas and also extending into the flats (usually the hallway) and there are often call points too, although if a risk of vandalism they may have been omitted as a variation.