Patent ID: 7710931

Claim:
A method for transitioning between a first wireless protocol having geographically dependent addressing and a second wireless protocol having non-geographically dependent addressing, the method comprising: a wireless device detecting a new system requiring reconnect of a packet data service while in a state during which link layer connectivity for a packet data service is maintained; the wireless device determining whether the new system has been previously visited by the wireless device; if the wireless device has not previously visited the new system, the wireless device attempting to establish a session using the second wireless protocol with the new system; and if the wireless device has previously visited the new system: a) the wireless device determining whether the new system previously allowed a session using the second wireless protocol; and b) if the new system previously allowed a session using the second wireless protocol, the wireless device attempting to establish a session using the second wireless protocol with the new system; wherein the first wireless protocol comprises SIP (simple IP) and the second wireless protocol comprises MIP (mobile IP).