Who can help me with the following problem. I want to make calls from a remote location using 3CXPhone or SIP Proxy Manager. This site is secure. Computers whose MAC or IP addresses are not known by the site admin (remote party) are not connected to the Internet. Pinging http://www.google.com is not possible. In IE, the IP address of a proxy server must be specified, otherwise it is not possible to browse the Internet. On a computer that is released by the site admin, I installed the 3CXPhone, but the tunnel to the 3CX server is not created. Also after installing 3CX SIP Proxy Manager the tunnel to the 3CX server is not created. On the 3CX server end everything is setup correctly, because I can successfully create a tunnel using 3CXPhone or SIP Proxy Manager from another remote site. What should I do to adjust 3CXPhone or SIP Proxy Manager to create a tunnel via this secure by proxy site to the 3CX server? Thank you very much.