  On March 2003, IBIS, the gamma-ray imager on board the INTEGRAL satellite,
detected an outburst from a new source, IGR J17464-3213, that turned out to be
a HEAO-1 transient, H1743-322. In this paper we report on the high energy
behaviour of this BHC studied with the three main instruments onboard INTEGRAL.
The data, collected with unprecedented sensitivity in the hard X-Ray range,
show a quite hard Comptonised emission from 3 keV up to 150 keV during the
rising part of the source outburst, with no thermal emission detectable. A few
days later, a prominent soft disk multicolour component appears, with the hard
tail luminosity almost unchanged: 10-9 erg*cm-2*s-1. Two months later, during a
second monitoring campaign near the end of the outburst, the observed disk
component was unchanged. Conversely, the Comptonised emission from the
central-hot part of the disk reduced by a factor of 10. We present here its
long term behaviour in different energy ranges and the combined JEM-X, SPI and
IBIS wide band spectral evolution of this source.
