  \integral and \sax observations of the neutron-star LMXB 4U~1705--44 have
been analysed to deeply investigate the spectral state transitions nature. Its
energy spectrum can be described as the sum of one or two blackbody, a 6.4-keV
Fe line and a component due to thermal Comptonization. For the first time in
this source, we find a strong signature of Compton reflection, presumably due
to illumination of the optically-thick accretion disk by the Comptonized
spectrum. Detection of two blackbody component in the soft states could
originate in the disk and the neutron-star surface, and the Comptonized
component arises from a hot inner flow with the seed photons coming from the
disk and/or the neutron-star surface. The spectral transitions are shown to be
associated with variations in the accretion rate, which changes in turn the
temperature of the Comptonizing electrons and the strength of Compton
reflection.
