Fast Multipole BEM for acoustics is a very powerful method to solve ultra large problems, which exploits iterative solvers. However, for Helmholtz problem it may fail to converge in some cases. Whereas FM-BEM provides a unique offering for ultra large problems, many industrial problems are in fact can be solved with tens of thousands of Dofs and can be considered as medium to large size. For such problems, direct solvers are still viable and provides a good option in terms of stability and convenience of solving many right-hand sides. In this paper, we present a fast multiple accelerated indirect BEM for solving medium to large size acoustic problems. The assembly process of the indirect BEM is accelerated by an efficient direct multi-level fast multipole method. The hypersingular term of the indirect BEM formulation in the far-field is directly approximated with the multipole expansion, while the near field terms are regularized to accommodate this hybrid approach. A parallel direct solver is used for solving the linear system. The results show that the FM accelerated assembly coupled with modern direct solvers offers a robust approach, where medium to large size acoustic problems can be efficiently solved on a modern desktop computer.