He doesn't recognize your voice over the wire—that would be luck.
"I'm afraid I foul-brooded you just now," said a voice over her shoulder.
The little maid with the key found her voice over this suddenly.
Then there was a voice over the banister says, 'Don't want any thing: send him away.'
"Allow me," said a voice over her shoulder, in French; it was the man of the newspaper.