Crossed Wires(1923)

Marcel Murphy, a telephone operator with society aspirations, overhears Mrs. Benson's conversation describing a party she is planning for her son, Ralph, and wangles an invitation by imitating Mrs. Benson's voice. At the party a maid accuses Marcel of the theft of another guest's jewelry, but she appeals to Mr. Benson, who covers up for her by describing Marcel as the daughter of an old friend and by secretly installing her in a hotel suite.