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We report on the identification of a new soft gamma-ray source, IGRJ12319-0749, detected with the IBIS imager on board the INTEGRAL satellite. Thesource, which has an observed 20-100 keV flux of ~8.3 x 10^{-12} erg cm^{-2}s^{-1}, is spatially coincident with an AGN at redshift z=3.12. The broad-bandcontinuum, obtained by combining XRT and IBIS data, is flat (Gamma ~ 1.3) withevidence for a spectral break around 25 keV (100 keV in the source rest frame).X-ray observations indicate flux variability which is further supported by acomparison with a previous ROSAT measurement. IGR J12319-0749 is also a radioemitting object likely characterized by a flat spectrum and high radioloudness; optically it is a broad-line emitting object with a massive blackhole (2.8 x 10^{9}$ solar masses) at its center. The source Spectral EnergyDistribution is similar to another high redshift blazar, 225155+2217 atz=3.668: both objects are bright, with a large accretion disk luminosity and aCompton peak located in the hard X-ray/soft gamma-ray band. IGR J12319-0749 islikely the second most distant blazar detected so far by INTEGRAL.

IGR J12319-0749: evidence for another extreme blazar found with INTEGRAL