Patent ID: 7496346

Claim:
A method for authorizing a mobile node for a service, comprising: receiving at an enforcement point a session initiation invitation from a mobile node located at a first cell site, the mobile node pre-authorized to access a plurality of wireless communication services without re-authorization even if the mobile node moves to a different cell site, the session initiation invitation comprising an authorization token and a session initiation object, the authorization token comprising a description of the plurality of wireless communication services the mobile node is pre-authorized to access without re-authorization even if the mobile node moves to a different cell site; determining whether the mobile node is authorized to access a service in accordance with the description of the plurality of wireless communication services the mobile node is pre-authorized to access; if the mobile node is authorized to access the service: sending the authorization token to an authorization server; sending the session initiation object to a server to initiate the service; and continuing the service without re-authorization when the mobile node moves from the first cell site to a second cell site.