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

  • US 7,170,863 B1
  • Filed: 12/21/2001
  • Issued: 01/30/2007
  • Est. Priority Date: 02/12/2001
  • Status: Active Grant
First Claim
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1. A method for user activation of push-to-talk (PTT) service in a wireless communication network, comprising:

  • initiating a session with a PTT Server wherein a user joins a group;

    registering a contact for the user;

    wherein the contact for the user is the PTT Server;

    notifying members of the group of other members'"'"' presence wherein notifying members of the group of other members'"'"' presence includes;

    requesting notification from a SIP Registrar by a presence server of users registering or deregistering SIP URL of the group as a contact;

    notifying the presence server by the SIP Registrar of said registrations and deregistrations;

    requesting from the presence server by members of the group information related to the presence of other group members;

    notifying group members of said information related to the presence of other group members.

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