Citrix makes remote access ("Desktop Virtualization") software with titles like GoToMeeting, GoToAssist, GoToMyPC, GoToWebinar, as well as many others. Citrix uses proprietary network protocols to connect to clients and provide access to the desktops of remote computers, e.g. to support customers remotely (GoToAssist).
This SonicWALL signature identifies legitimate Citrix JEDI protocol replies over TCP/443.