Inter, who were handed the 2006 title by default after table-toppers Juventus were demoted and second-placed AC Milan docked points for influencing the selection of referees, had been under investigation since last year after new evidence emerged in the criminal case into the match-fixing scandal.
Lawyers said phonetaps also implicated Inter in the affair for the first time but the club denied wrongdoing.
Despite the presentation of a report by FIGC prosecutors accusing Inter of sporting fraud, the FIGC's executive committee voted by a majority decision in Rome on Monday that a ruling to revoke the 2005/6 scudetto was beyond its jurisdiction, reports said.
The federation was not available for comment.
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