Judicial Magistrate Rajkumar Verma summoned Priyanka on May 19.
Mr Jaju lodged the case in June 2006 over a comment made by the actress last year. The two have a long-standing financial dispute and Priyanka has lodged a police complaint against Mr Jaju in Mumbai.
Mr Jaju, who resides in the Military Headquarters Of War (MHOW) area, complained to court over a telephonic threat issued to him.