Pena appeared in US District Court in New Jersey on Wednesday and pleaded guilty to wire fraud and conspiracy to commit wire fraud and unauthorized access to a protected computer. He faces a maximum of 25 years in federal prison and fines of at least $500,000 at sentencing, which is scheduled for May 14.

Pena and cohort Robert Moore were arrested in June 2006 and accused of carrying out an elaborate scheme that routed more than 10 million minutes of VoIP calls over the networks of a dozen or so telecommunications providers without their permission. They breached the networks by using brute-force attacks that deduced the security telephone prefixes needed to gain access.

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