Odisei S.A. was a French company based in Sophia-Antipolis, France that developed the first Internet protocol private branch exchange (IP-PBX) software solution hosted by carriers.

[2] It is likely the highest return on investment on a time-basis for a French-based technology company (50 to 1 ROI for seed investors).

IntraSwitch is to this date the sole complete implantation strictly following the Versit CTI ENcyclopedia specifications.

After acquisition by 8x8, Odisei changed its name to Netergy Networks Software Division then to Centile.

In 2003, Centile was bought out from 8x8 by Eurotel, a Nordic countries private investor group.