{HEAD ~ The method} 1, wherein establishing a session between the first control unit and the proxy server includes coupling through a second firewall, {TAIL ~ the proxy server} being inside the second firewall 
{ HEAD ~ The method } 1 , wherein establishing a session between the first control unit and the proxy server includes coupling through a second firewall , { TAIL ~ the proxy server } being inside the second firewall
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH