Packet-switched core network architecture for voice services on second- and third-generation wireless access networks

A mobile device for charging for a voice call via a communications system, the mobile device comprising:

• a memory storing computer executable instructions of:
• transmitting on a Session Initiation Protocol (SIP) voice control network, packets related to signaling for a voice call on the mobile device,
• wherein the mobile device is associated with a subscriber of a mobile communications service provider,
• wherein the transmitted packets contain information that forms the basis for the mobile communications service provider to charge the subscriber for the voice call, and
• wherein, during the voice call, the mobile device uses circuit-switched protocols to send and receive voice data and signaling for the call over an air interface to the communication system;
• and
• receiving a charging data record for the voice call wherein the received charging data record is generated using the information contained in the transmitted packets.

At least one computer-readable medium, excluding transitory signals and containing instructions, that when executed by a processor, perform a method in a mobile device of charging for a voice call via a communications system, the method comprising:

• transmitting, on a Session Initiation Protocol (SIP) voice control network, packets related to signaling for a voice call on the mobile device,
• wherein the mobile device is associated with a subscriber of a mobile communications service provider,
• wherein the transmitted packets contain information that forms the basis for the mobile communications service provider to charge the subscriber for the voice call, and
• wherein, during the voice call, the mobile device uses circuit-switched protocols to send and receive voice data and signaling for the call over an air interface to the communication system, and
• receiving a charging data record for the voice call wherein the received charging data record is generated using the information contained in the transmitted packets.