Prosecutors in Indonesia say they believe a life sentence is still appropriate for convicted Australian drug smuggler Schapelle Corby.

The prosecutors could decide to appeal against a decision to reduce Corby's prison sentence from 20 years to 15 years.

The 28-year-old's lawyers say they have already begun the process of appealing against the decision.

They are still convinced the Gold Coast woman has been treated too harshly.

Irwin Sirigar confirmed the news with Corby in her jail cell this morning.

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