Olympia CDP 24201 Cordless Phone "coming line hand held" Questions

...hand held Panasonic phone keeps saying move closer to base and try again. When I do that, it still doesnt work. When I hang it up, the screen says line in use. Any ideas. I have tried to re-register ...

...Line Cordless Phone model # CDP 24201. Our setup includes the base unit that holds one phone and a separate speaker phone and two additional handheld phones. Recently we have experienced where we can ...