Fox and the producers of American Idol are monitoring the "phone slammers" trying to sway the outcome of the show -- and will take action if the callers have an impact on the show.

Sources say the network is keeping track of the slammers, and will "get involved" in trying to stop them if they're affecting the voting. 

"They've been monitoring it and obviously they will get involved if it's somehow affecting the vote," said one insider. 

"The most important thing is the integrity and validity of the phone vote -- and at this point, [the phone slamming] hasn't corrupted the system." 

It has come to light that about 100 "power dialers" with access to high-tech equipment are jamming phone lines to vote for their American Idol favorites. 

These people can cast as many as 10,000 votes a night from a single phone. 

Although American Idol producers say the votes have been "insignificant," producers are worried more and more people will start the "phone slamming" in an attempt to dictate who stays and who goes on the reality show. 

Fox has been logging upwards of 10 million viewer phone votes a week on American Idol, one of the summer's biggest hits.

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