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Call handling on dual-mode wireless handsets

  • US 10,117,134 B2
  • Filed: 07/25/2014
  • Issued: 10/30/2018
  • Est. Priority Date: 04/06/2005
  • Status: Active Grant
First Claim
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1. A telecommunication system for handling a call placed by a dual-model phone capable of operating in a cellular mode and in a Voice over Internet Protocol (“

  • VoIP”

    ) mode, the system comprising;

    a mobile switching center (“

    MSC”

    ) in a cellular system configured to;

    receive an outgoing call from the dual-mode phone to a destination telephone separate from the dual-mode phone, the outgoing call comprising call information originating from the dual-mode phone operating in the cellular mode in the cellular system, wherein the call information comprises a destination telephone number associated with the destination telephone that identifies a destination for the call and information identifying the dual-mode phone, wherein the destination telephone number is different from a telephone number of the dual-mode phone, and wherein the dual-mode phone is simultaneously registered with the cellular system and the VoIP system;

    obtain information for transferring the call to a VoIP system from the cellular system;

    transmit the destination telephone number to the VoIP system, wherein the destination telephone number is transferred to the VoIP system via at least one of in-band signaling or out-of-band signaling; and

    transfer the call to the VoIP system from the cellular system while the dual-mode phone is operating in the cellular mode, such that the VoIP system can route the call to the destination telephone number received from the MSC while the dual-mode phone is operating in the cellular mode and can thereafter transition the call away from the cellular system when the dual-mode phone begins operating in the VoIP mode.

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