Hi Manik,
As mentioned by other members, any establishment employing more that 20 employees, must get itself registered with RPFC.
It is a statutory requirement for every employer, which has been made mandatory with an objective to extend this benefit of EPF and EPS to all classes of workers. It gets deducted @ 12% (monthly) on sum of Basic, DA and Food allowanace, if any. An equal amount of contribution is also made by the employer towards it.
Any employee not getting this benefit (subject to headcount of 20 employees in the orgnanization) may go to the labour court and claim it from the employer. It is the right of an employee. Employers not abiding by the same are in for some serious trouble.