I do not have a cisco contract or license, but I did order the Cisco CP-8851 IP Phone from Amazon, and was hoping that I could configure it to work with my VoIP SIP PBX. But I can't seem to log into the Web GUI to configure anything, it seems pretty locked down. When I go to try to download anything from Cisco, it seems that the Cisco site will not let me because I don't have an active contract. 

How else could I configure my device to run on my VoIP PBX? I have the Cisco 525G2a and was able to configure it from the Web GUI just fine, but I wanted a nicer phone.