"In the case registered yesterday evening, these people have been charged with making blank calls, using obscene and abusive language with women operators at the control room and hindering government work," station officer of Kotwali police station JN Sharma said, adding that they will be arrested soon.
On December 14, 100 people were arrested and 400 were charged with the same crime.
The hi-tech police control room with helpline number 100 was inaugurated by Chief Minister Akhilesh Yadav on October 18, 2013.
Cases have been registered against nearly 2000 people in the month of December alone, he said.