Designing a performant second generation spectro-imaging instrument for the VLTI is challenging and several concepts have been proposed. During the past 10 years, the potential of integrated optics (IO) technology has been tested to replace the heart of an interferometric beam combiner. Studies of optimized IO optical schemes and complete characterizations of IO combiners have been made. It has been proved that it improves the quality of the interferometric measurements, by providing high stability and spatial filtering and that it highly simplifies a multi beam combination instrument. We report new interferometric measurements obtained with four-telescope IO combiners in the near infrared H band. We describe the combiners and their complete characterization through the analysis of polarisation properties, instrumental visibilities and sources of losses. These results demonstrate one more time that the IO technology is particularly well suited for interferometric combination of multiple beams.