The Witness and Victim Protection Agency has urged former top cop Susno Duadji to turn himself over to authorities after the Supreme Court upheld a graft conviction and three-and-a-half year sentence handed down to him last year.

Abdul Haris Semendawai, the head of the agency known as the LPSK, said on Sunday that his office had done all it could to try to minimize Susno's jail time by citing his importance as a whistle-blower shining a light on graft in the police force.

"The prosecutors wanted him to get seven years, but the Supreme Court has upheld the lower court's ruling of just half that time. The judges at both the district court and Supreme Court noted that Susno was a whistle-blower," Abdul said.

Susno, the former National Police chief of detectives, was convicted by the South Jakarta District Court in March 2011 of taking a Rp 500 million ($57,500) bribe to settle a legal dispute over the ownership of a fish farm in 2009.

The Jakarta High Court upheld the conviction and the three-and-a-half year sentence in November last year, and now the Supreme Court has also weighed in.

Despite the rulings, however, Susno remains free, having spent just 120 days in jail between his arrest and trial.

Untung Sunaryo, a lawyer for the former three-star police general, said his side had not received a copy of the Supreme Court verdict, which was handed down on Nov. 22, but added it appeared that the LPSK had not advocated strongly enough on behalf of his client.

"If there had been an official letter from the LPSK, it would have been taken into consideration by the court. But the fact remains that the sentence was not reduced," he said.