System and method for providing least-cost routing of voice connections between home and foreign networks using voice-over-IP infrastructure

A method for providing least-cost routing of calls for a roaming mobile wireless device having a home phone number associated therewith, the method comprising:

• obtaining local wireless service for the mobile wireless device, including associating a local phone number with the mobile wireless device;
• detecting the association of the local phone number with the mobile wireless device using an agent on the mobile wireless device;
• establishing a wireless connection between the mobile wireless device and an enterprise network;
• registering the mobile wireless device with a common registrar coupled to the enterprise network, including providing an indication of a current location of the mobile wireless device;
• sending an acknowledgement from the common registrar to a local voice over internet protocol (VoIP) gateway coupled to the enterprise network;
• sending information from the common registrar to a home VoIP gateway coupled to the enterprise network, the information including the indication of the current location of the mobile wireless device;
• routing an inbound call to the home number associated with the mobile wireless device from the home VoIP gateway to the local VoIP gateway;
• originating an outbound call from the mobile wireless device;
• selecting, using the agent, the enterprise network for handling the outbound call, wherein the agent chooses a least cost route for the outbound call in accordance with routing rules for where the mobile wireless device is currently attached;
• providing the outbound call from the mobile wireless device to the local VoIP gateway;
• routing the outbound call from the local VoIP gateway to the home VoIP gateway;
• and
• forwarding the outbound call from the home VoIP gateway to a destination of the outbound call.