IP Phone, Brand Name : Cisco

We are offering cisco systems ip phone. cisco systems cp-7935-ch1 ip phone with user license: cisco 7935 unified ip conference station (spare)the cisco connected to my universitys vpn with phone & laptop via cisco anyconnect. But says ip is same if vpn or not. Why? cisco unified wireless ip phone 7921g - wireless voip phone - ieee 802.11b/g/a (wi-fi) - sccp