Dean Stewart Poot, 30, appeared in the County Court on Thursday for the second day of his plea hearing.

He has admitted to several charges including using a carriage service to menace and obtaining property by deception.

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On Wednesday, the court heard Poot conducted a coordinated attack on Victoria Police's phone system, with 10,984 abusive calls being diverted to stations across the state.

Prosecutor Daniel Holding on Thursday told the court Poot also targeted random people through a similar electronic telephone system.

Between January 18, 2019, and February 28, 2019, Poot set up a virtual machine, which placed about 127,000 calls to random phone numbers.

The system also sent 23,400 text messages to people. The messages detailed pleas for help.

Some of the call recordings were played to the County Court on Thursday.

They started with abusive messages from automated voices, before the call recipients became confused or distressed at the abuse.

One of the recordings showed a recipient calling the number that had sent the first text message. The call was instantly diverted to another unsuspecting person.

In that call, the two random citizens became aggressive towards each other because they each thought the other person was issuing the automated abuse.

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The court heard between November 18, 2017, and June 14, 2019, Poot also created multiple phishing websites to obtain credit card details of unsuspecting people.

About 2500 people's personal information was stolen through the sites.

Poot used some of the stolen credit card details to purchase a 3DTEK Heavymill, valued at $6810, and CNC router valued at $4125.

In June 2019, Poot also deceptively obtained the credit history of at least six people.

Poot was arrested on June 14, 2019, and provided a no-comment interview to police.

He was remanded in custody before he was released on bail in April last year. He has served 307 days in pre-sentence detention.

Mr Holding described the offending as "very unusual". He said it appeared Poot caused distress to random members of the public for his own gratification.

The prosecution and defence counsels' submissions about sentence were adjourned to a further plea hearing in November.

Poot's bail was extended to his next County Court date.

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