You should read the details and FAQ on PF site first.
Then you would have automatic had the answer.
PF scheme provides for 12% of salary of employee being deducted and deposited with the department with matching contribution from employer. Where salary is above ₹15000, the deductions are to be made Asif the salary is ₹15,000.
The act also allows voluntary contribution by the employee above the limit specified, subject to not exceeding total deduction from gross salary of 50% (payment of wages act). The employer is not required to match the contribution beyond ₹1800 per month. However, nothing in the law prevents the employer from giving more.