County Court Judge William Stuart on Tuesday dubbed Dean Stewart Poot a "serial pest" after the 30-year-old pleaded guilty to 11 offences including using a carriage service to menace and obtaining property by deception.

But Judge Stuart on Thursday sentenced Poot to time served and a lengthy community corrections order.

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The court heard between June 16, 2018, and October 15, 2018, Poot set up a device - a Gigabyte Brix - with telephony software so he could conduct automated virtual telephone calls.

Between October 16 and October 18, Poot conducted a coordinated attack on Victoria Police's phone system. Poot used the pre-programmed Gigabyte Brix software to call random numbers.

If the recipients of the calls answered, they heard abusive messages before the call was diverted to a police station. The court heard 10,984 calls were diverted to stations across the state.

Poot also targeted random people through a similar electronic telephone system.

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Between January 18, 2019, and February 28, 2019, Poot set-up a virtual machine, which placed 127,000 abusive calls to random phone numbers. The system also sent 23,400 text messages.

Poot also created multiple phishing websites to obtain credit card details of about 2500 unsuspecting people.

Judge Stuart sentenced Poot to 307 days of pre-sentence detention, which was reckoned as already served, and a recognisance release order.

Poot was also ordered to complete a three-year community corrections order with 300 hours of unpaid community work.

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