  GX 339--4 is a well-known microquasar. In this contribution we show the
obtained results with the INTEGRAL and XMM-Newton observatories of the outburst
undertaken on 2007. The observations cover spectral evolution from the hard,
soft intermediate states to the high/soft state. Spectral hardening correlated
with the appearance of an skewed Fe line is detected during one of the
observations during the soft intermediate state. In all spectral states joint
XMM/EPIC-pn, JEM-X, ISGRI and SPI data were fit with the hybrid
thermal/non-thermal Comptonization model (EQPAIR). With this model a
non-thermal component seems to be required by the data in all the observations.
Our results imply evolution in the coronal properties, the most important one
being the transition from a compact corona in the first observation to the
disappearance of coronal material in the second and re-appearance in the third.
We discuss the results obtained in the context of possible physical scenarios
for the origin and geometry of the corona and its relation to black hole
states.
