I want to make a service that identifies the device to generate the right content. I know how to get the device's IP (given with the request) and MAC-adres. But this is not good enough, I want to get the phone-number. So that when I move to an other location and log into the IP Phone over there (other IP and Other MAC-adres, but same phone-number), i still recieve the content related to my phone-number.
How will I do this? If there is an other (better) way, i'm listening ;)