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

  • US 8,447,341 B2
  • Filed: 06/09/2010
  • Issued: 05/21/2013
  • Est. Priority Date: 02/12/2001
  • Status: Active Grant
First Claim
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1. A method for enabling a PTT private call between users in a wireless communications network, the method comprising:

  • receiving an SIP SUBSCRIBE to request a speech token of a multicast group, the SIP SUBSCRIBE including private identifications for a called party and a calling party;

    responsive to receipt of the SIP SUBSCRIBE, removing the calling party and the called party from the multicast group; and

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

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