Answer:
dispatch a police unit to check on the caller.
Explanation:
In such a scenario the usual response would be to dispatch a police unit to check on the caller. This is because many times individual may be in serious danger and cannot remain on the call, and not for a lack of trying. Such a scenario may be that the individual is having a heart attack, or is loosing a lot of blood and passes out, or even the individual is in a hostile situation and simply cannot talk. By sending the dispatcher they can quickly check to make sure the individual that called is fine and act accordingly if they are not.
