within call
Close enough to clearly hear when someone is calling to or summoning one. I don't mind if you play outside, but stay within call, OK? Be sure you're within call the whole time—it's very easy to get lost in these mountains.
within call
Also, within hail. Near enough to hear a summons, as in Tommy's allowed to play outside but only within call of his mother, or We told them they could hike ahead of us but to stay within hail. The first term was first recorded in 1668, the variant in 1697.
within call
Close enough to come if summoned: The nurse is within call if you need him.