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Call handling on dual-mode wireless handsets

  • US 8,825,108 B2
  • Filed: 07/19/2006
  • Issued: 09/02/2014
  • Est. Priority Date: 04/06/2005
  • Status: Active Grant
First Claim
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1. A telecommunication system for handling a call, the system comprising:

  • a cellular system comprising a mobile switching center (“

    MSC”

    ) configured to provide cellular service to the dual-mode phone that operates in a cellular mode and in a voice over Internet Protocol (“

    VoIP”

    ) mode; and

    a VoIP system in communication with the MSC, the VoIP system comprising a VoIP switch and configured to serve as an interface between the MSC and a public switched telephone network (“

    PSTN”

    ), such that when a call is received on a public VoIP telephone number for the dual mode phone, the VoIP system is configured to;

    route the call around the MSC and through the VoIP switch to the dual-mode phone when the dual-mode phone is registered with the VoIP system; and

    route the call through the MSC to a cellular telephone number associated with the dual-mode phone in the cellular system only if the dual-mode phone has unintentionally lost contact with the VoIP system and is thus not registered with the VoIP system, wherein the dual-mode phone, upon obtaining Internet Protocol (“

    IP”

    ) access, automatically registers with the VoIP system.

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