Flow & Variables
A flow is a predefined set of destinations that can be used in other Configuration directive. It is like a Macro, allowing to use the same steps of destinations in several place and maintain in a single location.
A flow can have a number associated, so dialing that number, will make the action assigned.
Assigned to each flow there is a variable that can be used to track a PBX status, like day/night or even something more fancy. The variable name can be referenced in the destinations, when allowed and several values can be assigned to each of the states, so the change in value will change also the status of the BLF for the flow number.