  During last years a few massive binary systems have been detected in the TeV
gamma-rays. This gamma-ray emission is clearly modulated with the orbital
periods of these binaries suggesting its origin inside the binary system. In
this paper we summarize the anisotropic IC e-p pair cascade model as likely
explanation of these observations. We consider scenarios in which particles are
accelerated to relativistic energies, either due to the presence of an
energetic pulsar inside the binary, or as a result of accretion process onto
the compact object during which the jet is launched from the inner part of the
accretion disk, or in collisions of stellar winds from the massive companions.
