  SmB6 was recently proposed to be both a strong topological insulator and a
topological crystalline insulator. For this and related cubic topological Kondo
insulators, we prove the existence of four different topological phases,
distinguished by the sign of mirror Chern numbers. We characterize these phases
in terms of simple observables, and we provide concrete tight-binding models
for each phase. Based on theoretical and experimental results for SmB6 we
conclude that it realizes the phase with C^+_{k_z=0}=+2, C^+_{k_z=pi}=+1,
C^+_{k_x=k_y}=-1, and we propose a corresponding minimal model.
