I was asked by my supervisor to make these 8811 phones able to transfer calls and have forwarding functions. The only progress I am able to make are with the XML files. By adding <callForwardURI>x-serviceuri-cfwdall</callForwardURI> I can actually make the "Forward All" button work, but after typing in a number, nothing happens. Is there some sort of configuration preventing specifically these phones from performing these functions?