Patent ID: 8428237
Filing Date: 2013-04-23
Classification: H04L,H04W

Abstract:
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.