Push-to-talk-over-cellular (poc)

A system for providing advanced voice services in a wireless communications network, comprising:

• one or more servers that interface to the wireless communications network to perform advanced voice services, the advanced voice services including an instant two-way half-duplex voice call within a group of users of the wireless communications network comprising a Push-to-Talk-over-Cellular (PoC) call session;
• wherein both the servers and the handsets that use the advanced group services communicate with each other using Internet Protocol (IP) control messages within the wireless communications network, and at least one of the servers switches IP voice packets for the advanced group services between the handsets across the wireless communications network;
• and
• wherein a PoC Client executed by the handset detects when the user changes a subscriber identity module (SIM) on the handset being used for PoC service and re-activates in response thereto.

A system for providing advanced voice services in a wireless communications network, comprising:

• one or more servers that interface to the wireless communications network to perform advanced voice services, the advanced voice services including an instant two-way half-duplex voice call within a group of users of the wireless communications network comprising a Push-to-Talk-over-Cellular (PoC) call session;
• wherein both the servers and the handsets that use the advanced group services communicate with each other using Internet Protocol (IP) control messages within the wireless communications network, and at least one of the servers switches IP voice packets for the advanced group services between the handsets across the wireless communications network;
• and
• wherein a PoC Client executed by the handset supports dual subscriber identity modules (SIMs) on the handset being used for PoC service.

A system for providing advanced voice services in a wireless communications network, comprising:

• one or more servers that interface to the wireless communications network to perform advanced voice services, the advanced voice services including an instant two-way half-duplex voice call within a group of users of the wireless communications network comprising a Push-to-Talk-over-Cellular (PoC) call session;
• wherein both the servers and the handsets that use the advanced group services communicate with each other using Internet Protocol (IP) control messages within the wireless communications network, and at least one of the servers switches IP voice packets for the advanced group services between the handsets across the wireless communications network;
• and
• wherein one or more of the servers support geographical redundancy.

A system for providing advanced voice services in a wireless communications network, comprising:

• one or more servers that interface to the wireless communications network to perform advanced voice services, the advanced voice services including an instant two-way half-duplex voice call within a group of users of the wireless communications network comprising a Push-to-Talk-over-Cellular (PoC) call session;
• wherein both the servers and the handsets that use the advanced group services communicate with each other using Internet Protocol (IP) control messages within the wireless communications network, and at least one of the servers switches IP voice packets for the advanced group services between the handsets across the wireless communications network;
• and
• wherein one or more of the servers is a Web Group Provisioning (WGP) Server that provides a Corporate Administration Tool (CAT) for providing subscriber management, group management, contact management and associations between corporations.

A system for providing advanced voice services in a wireless communications network, comprising:

• one or more servers that interface to the wireless communications network to perform advanced voice services, the advanced voice services including an instant two-way half-duplex voice call within a group of users of the wireless communications network comprising a Push-to-Talk-over-Cellular (PoC) call session;
• wherein both the servers and the handsets that use the advanced group services communicate with each other using Internet Protocol (IP) control messages within the wireless communications network, and at least one of the servers switches IP voice packets for the advanced group services between the handsets across the wireless communications network;
• and
• wherein a PoC Client executed by the handset is configured to provide a specific corporate user experience on the handset.

A system for providing advanced voice services in a wireless communications network, comprising:

• one or more servers that interface to the wireless communications network to perform advanced voice services, the advanced voice services including an instant two-way half-duplex voice call within a group of users of the wireless communications network comprising a Push-to-Talk-over-Cellular (PoC) call session;
• wherein both the servers and the handsets that use the advanced group services communicate with each other using Internet Protocol (IP) control messages within the wireless communications network, and at least one of the servers switches IP voice packets for the advanced group services between the handsets across the wireless communications network;
• and
• wherein a PoC Client executed by the handset reports any changes to a country or network identifier for the network to a PoC Server.

A system for providing advanced voice services in a wireless communications network, comprising:

• one or more servers that interface to the wireless communications network to perform advanced voice services, the advanced voice services including an instant two-way half-duplex voice call within a group of users of the wireless communications network comprising a Push-to-Talk-over-Cellular (PoC) call session;
• wherein both the servers and the handsets that use the advanced group services communicate with each other using Internet Protocol (IP) control messages within the wireless communications network, and at least one of the servers switches IP voice packets for the advanced group services between the handsets across the wireless communications network;
• and
• wherein a PoC Client executed by the handset includes an Answer or Ignore option for use when a cellular service call overlaps with the PoC call session.

A system for providing advanced voice services in a wireless communications network, comprising:

• one or more servers that interface to the wireless communications network to perform advanced voice services, the advanced voice services including an instant two-way half-duplex voice call within a group of users of the wireless communications network comprising a Push-to-Talk-over-Cellular (PoC) call session;
• wherein both the servers and the mobile units that use the advanced group services communicate with each other using Internet Protocol (IP) control messages within the wireless communications network, and one or more of the servers switches IP voice packets for the advanced group services between the mobile units across the wireless communications network;
• wherein one or more of the servers is a controlling server that manages the PoC call session by acting as an arbitrator for the PoC call session;
• and
• wherein the controlling server sends connect messages for the PoC call session to calling and called parties, and the controlling server uses acknowledgments for the connect messages to determine whether the called parties have joined the PoC call session or not.