Contract labour supply

There is a person who is a labour supplier who supply casual labour to Builders, those labour are not on payroll of labour supplier or the builder.

The builder gives the requirement for labour and the Labour Supplier arranges that for builder. Builder makes payment to Labour supplier and he gives payment to labour and in between he gets his commission. Bill is raised for mandays.

The question is : Is it a taxable service as Manpower supplier or Business Auxiliary Services. Why?