Patent ID: 7567804

Claim:
A method comprising: wirelessly receiving into a radio access network (RAN) from a wireless communication device (WCD) a radio access registration message seeking to register the WCD for wireless communication service in the RAN; thereafter assigning a network address to the WCD, for use by the WCD to engage in communications on a packet-switched network; wirelessly transmitting to the WCD from the RAN, in response to the radio access registration message, a radio access registration response message, wherein the radio access registration response message acknowledges registration of the WCD for wireless communication service in the RAN and specifies the assigned network address for use by the WCD; and after transmitting the radio access registration response message, with the assigned network address, to the WCD, (i) receiving into a call controller from the WCD a call origination request seeking to establish a call to a called party, and responsively sending to the WCD a network address of a remote endpoint serving the called party, and (ii) transporting call setup signaling that is being communicated between the assigned network address of the WCD and the network address of the remote endpoint, for setting up the call as a packet-based real-time media session between the WCD and the remote endpoint, wherein the origination request carries a service option code, and wherein sending the network address of the remote endpoint to the WCD comprises sending the network address of the remote endpoint in response to detection of the service option code in the origination message.