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Push-to-talk wireless telecommunications system utilizing a voice-over-IP network

  • US 8,428,237 B1
  • Filed: 10/01/2010
  • Issued: 04/23/2013
  • Est. Priority Date: 02/12/2001
  • Status: Expired due to Term
First Claim
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1. A method for push-to-talk (PTT) private calls for users in a wireless communications network, comprising:

  • receiving a selection of a called party for a private call, the selection being made by a calling party on a mobile device;

    determining a first private identification for the called party;

    determining a second private identification for the calling party;

    transmitting a first SIP SUBSCRIBE including the first and second private identifications to request a speech token associated with the private call;

    redirecting the first SIP SUBSCRIBE to a PTT Server for purposes of removing the calling party and the called party from a multicast group;

    receiving an acknowledge message that includes the speech token;

    transmitting calling party information from the PTT Server to the called party;

    communicating speech packets from the calling party to the called party in a half-duplex manner;

    determining a PTT release command made on the mobile device;

    transmitting a second SIP SUBSCRIBE to release the speech token; and

    notifying the calling and called parties that the speech token is available.

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