I have several remote sites where i'm trying to setup the SIP Proxy Manager to tunnel calls to/from remote extensions. On one of the sites the installer failed when trying to start the service: Service '3CX SIP Proxy Tunnel' (3CXSIPProxy) failed to start. Verify that you have sufficient privileges to start system services. This is a Windows XP SP2 machine logged in as local Administrator. Has anyone encountered this error? Other applications/service behave normally, are there any special requirements for SIP Proxy Manager?