Handoff for Cellular and Internet Protocol Telephony
First Claim
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1. A method for handoff of telephone sessions comprising:
- maintaining an active telephone session between a mobile unit and a telephone system over the data communication system;
while maintaining the session over the data communication system, determining information associated with a radio system associated with the telephone system; and
handing off the active telephone session from the data communication system to the radio system according to the determined information.
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Accused Products
Abstract
A telephone system supports communication with user devices over both a cellular radio network as well as over an Internet Protocol (IP) network, and enables roaming and active call handoff between cellular and IP domains. Components of the system interact with conventional cellular telephone systems, for example, by emulating behavior of control components, providing proxy services for conventional components, transporting cellular telephone control communications over IP connections, or by simulating cellular operating characteristics of user devices operating in an IP domain.
256 Citations
19 Claims
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1. A method for handoff of telephone sessions comprising:
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maintaining an active telephone session between a mobile unit and a telephone system over the data communication system; while maintaining the session over the data communication system, determining information associated with a radio system associated with the telephone system; and handing off the active telephone session from the data communication system to the radio system according to the determined information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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communicating telephone system control information between a dual-mode device and the telephone system, including passing the telephone control information over a data network encapsulated in a data network communication protocol; and performing a handoff of the dual mode device between the telephone system and the data network using the encapsulated telephone control information. - View Dependent Claims (13, 14, 15, 16)
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17. A dual mode device for communicating over a telephone system and a data network comprising:
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a data network client, including components for establishing communication sessions over the data network; a telephone system client, including components for establishing communication sessions over the telephone system; and a service controller coupled to the data network client and to the telephone system client that enables a handoff of an active communication session between the data network client and the telephone system client. - View Dependent Claims (18, 19)
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Specification