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System and method for transitioning a communication session between networks that are not commonly controlled

  • US 9,648,051 B2
  • Filed: 09/18/2014
  • Issued: 05/09/2017
  • Est. Priority Date: 09/28/2007
  • Status: Expired due to Fees
First Claim
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1. A method comprising:

  • receiving, by a network transition gateway, a first message from a mobile device indicating that the mobile device is in a session initiation protocol (SIP) wireless hotspot, wherein the first message is received directly from the mobile device by the network transition gateway and does not pass through a cellular network;

    receiving, by the network transition gateway, a second message from the mobile device indicating that the mobile device is engaged in a communication session with a second device using a first call leg via the cellular network while in the SIP wireless hotspot, wherein the second message is received directly from the mobile device by the network transition gateway and does not pass through the cellular network, and wherein the network transition gateway has no control over the cellular network and wherein the network transition gateway is configured to send only requests for establishing, routing, and breaking down a call to the cellular network;

    requesting, by the network transition gateway, that a public switched telephone network (PSTN) gateway add the mobile device to the communication session using a second call leg via the SIP wireless hotspot and terminate the first call leg, wherein the PSTN gateway is separate from the cellular network;

    receiving, by the network transition gateway, an affirmative response from the PSTN gateway; and

    sending, by the network transition gateway, a third message to the mobile device to notify the mobile device of the affirmative response.

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