[within call] or [within hail] {adv. phr.}
1. Near enough to hear each other's voices.
* /When the two ships were within hail, their officers exchanged messages./* /Billy's mother told him to stay within call because supper was nearly ready./
2. In a place where you can be reached by phone, radio, or TV and be called.
* /The sick man was very low and the doctor stayed within call./* /The soldiers were allowed to leave the base by day, but had to stay within call./