New Caledonia's signatories of the 1998 Noumea Accord on greater autonomy are due to meet next month in Paris.
The French minister in charge of overseas territories, Brigitte Girardin, has invited the parties for regular follow-up talks.
But questions remain as to who is eligible to join the meeting.
The accord was signed by the anti-independence RPCR party but it lost power in the May election to a rival anti-independence party, the Future Together.
The other signatory, the pro-independence FLNKS movement, has been without a president for three years and rival factions within the umbrella group disagree on how the accord is being implemented.