extension **
telephone extension
extension phone

He pointed to the floor below the telephone extension in the barn.

There was a telephone extension on the organ, but Flynn had not used it.

If they ask me what I want it for, I'll tell them I'm putting in a telephone extension.

Regular restaurant customers are sometimes given a telephone extension to call to reach a manager or owner directly.

"Put him through," James told her and walked over to the side table on which stood the telephone extension.

There was a telephone extension on his bedside table.

He leaned back in his chair and looked out into the kitchen at the telephone extension there.

A roster of telephone extensions had been made into a poster, large enough to be read from any point in the room.

She could hear Bill speaking in a low voice on the telephone extension in his bedroom along the landing.

His stomach was turning and he needed the lavatory, but the bathroom contained no telephone extension.