Please see here for S360 versioning policy
ContactInteractionPublicService: 2_22. Active version. This version can be subject to minor retro-compatible changes without warnings.
ContactInteractionPublicService: 2_21. Latest frozen version. Base by default all your developments on this one.
ContactInteractionPublicService: 2_20. Deprecated. This version is frozen and still supported.
ContactInteractionPublicService: 2_19. Deprecated. This version is frozen and still supported.
ContactInteractionPublicService: 2_18. Deprecated. This version is frozen and still supported.
ContactInteractionPublicService: 2_17. Deprecated. This version is frozen and still supported.
ContactInteractionPublicService: 2_12. END OF LIFE. Please consider switching to the latest version of the webservices, because this version may be removed anytime from support.