-He’s busy at the momant.
-She’s occupied at the moment.
-He’s on another line.
-I’m sorry that namber’s engaged.
-I’m afraid he’s not in at the moment.
-I’m sorry he’s not on another line.
-I’m sorry he’s out right now.
-I’m sorry he’s in a meeting on a holiday.
-I’m afraid hhe can’t speak to you.
-I’m afraid she can’t come to the phone.