how do I use the radio in missions?

[vassili]

Is it possible to put in a radio callsign, so that when raioed, it activates the waypoints for units. eg, radioing for reinforcements.

[Messiah]

make a waypoint for the group you want as reinforcements where they wait.... then create a waypoint where the move.

create a trigger with condition 'radio alpha' and syncronize it with the first waypoint...

when u press radio alpha, the men will move to their next waypoint,.