Starting PF contribution in-between the employment. Is it possible/allowed?

Positive Metering
After opting out of EPF contribution at the time of joining, an employee would like to contribute to EPF after a few months. Is this possible? Can the employer ignore the employee's non-contributory period and enrol him as a new joinee-cum-EPF member with a new date of joining? What are the repercussions? Please guide.
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