Provided are compounds, processes and synthetic intermediates useful for the preparation of compounds of the formula I and IX . The clamping plate is projected on all sides across the hollow body, thereby forming a fastening flange. Through voice and data gateways the system can transfer both voice and data streams through WiFi; Phone devices with both wired and WiFi wireless interfaces can automatically switches between wired network and wireless network through WiFi access points. In addition, another aspect of the present invention provides for recognizing a failure occurrence in the active switching element, and thereafter switching to the redundant switching element with the potential for minimal frame loss.