Abstract: A system and process for onboarding client devices to a key management server. In operation, a device generates an asymmetric key pair including a public key and a private key. The device obtains an access token from an identity management server after successfully authenticating with the identity management server. The device transmits a request including the access token and the public key to the key management server to onboard the client device. The device receives a response including encrypted bootstrap information from the key management server. The bootstrap information included in the response is encrypted using the public key of the asymmetric key pair. The device decrypts the encrypted bootstrap information using the private key of the asymmetric key pair to obtain the bootstrap information and then uses the bootstrap information for encrypting communications transmitted to the key management server or for decrypting communications received from the key management server.

Abstract: Systems and methods for multiple mode push-to-x group calls. One example embodiment provides a push-to-X server. The push-to-X server includes a communication interface communicatively coupled to a communication network and an electronic processor. The electronic processor receives, via a unicast uplink channel, a group call request from a first subscriber unit of the communication network. The electronic processor receives, from the first subscriber unit, a push-to-X data stream. The electronic processor receives a unicast channel request from a second subscriber unit of the communication network. In response to receiving the unicast channel request, the electronic processor establishes a unicast channel resource with the second subscriber unit. The electronic processor transmits the push-to-X data stream to the second subscriber unit via the unicast channel resource and transmits the push-to-X data stream to a plurality of subscriber units via a broadcast media bearer channel.

Abstract: A system and process for onboarding client devices to a key management server. In operation, a device generates an asymmetric key pair including a public key and a private key. The device obtains an access token from an identity management server after successfully authenticating with the identity management server. The device transmits a request including the access token and the public key to the key management server to onboard the client device. The device receives a response including encrypted bootstrap information from the key management server. The bootstrap information included in the response is encrypted using the public key of the asymmetric key pair. The device decrypts the encrypted bootstrap information using the private key of the asymmetric key pair to obtain the bootstrap information and then uses the bootstrap information for encrypting communications transmitted to the key management server or for decrypting communications received from the key management server.

Abstract: Techniques for variable length talk permit tone are provided. a request to initiate a Push-to-Talk (PTT) call may be received from a PTT call initiator. A first estimated length of time needed to set up resources for the PTT call may be determined. A second length of time to playout a talk permit tone (TPT) may be determined based on the determined first estimated length of time. An indication may be sent to the PTT call initiator to playout the TPT for the determined second length of time.

Abstract: Systems and methods for multiple mode push-to-x group calls. One example embodiment provides a push-to-X server. The push-to-X server includes a communication interface communicatively coupled to a communication network and an electronic processor. The electronic processor receives, via a unicast uplink channel, a group call request from a first subscriber unit of the communication network. The electronic processor receives, from the first subscriber unit, a push-to-X data stream. The electronic processor receives a unicast channel request from a second subscriber unit of the communication network. In response to receiving the unicast channel request, the electronic processor establishes a unicast channel resource with the second subscriber unit. The electronic processor transmits the push-to-X data stream to the second subscriber unit via the unicast channel resource and transmits the push-to-X data stream to a plurality of subscriber units via a broadcast media bearer channel.

Abstract: Systems and methods for multiple mode push-to-x group calls. One example embodiment provides a push-to-X server. The push-to-X server includes a communication interface communicatively coupled to a communication network and an electronic processor. The electronic processor receives, via a unicast uplink channel, a group call request from a first subscriber unit of the communication network. The electronic processor receives, from the first subscriber unit, a push-to-X data stream. The electronic processor receives a unicast channel request from a second subscriber unit of the communication network. In response to receiving the unicast channel request, the electronic processor establishes a unicast channel resource with the second subscriber unit. The electronic processor transmits the push-to-X data stream to the second subscriber unit via the unicast channel resource and transmits the push-to-X data stream to a plurality of subscriber units via a broadcast media bearer channel.

Abstract: Systems and methods for multiple mode push-to-x group calls. One example embodiment provides a push-to-X server. The push-to-X server includes a communication interface communicatively coupled to a communication network and an electronic processor. The electronic processor receives, via a unicast uplink channel, a group call request from a first subscriber unit of the communication network. The electronic processor receives, from the first subscriber unit, a push-to-X data stream. The electronic processor receives a unicast channel request from a second subscriber unit of the communication network. In response to receiving the unicast channel request, the electronic processor establishes a unicast channel resource with the second subscriber unit. The electronic processor transmits the push-to-X data stream to the second subscriber unit via the unicast channel resource and transmits the push-to-X data stream to a plurality of subscriber units via a broadcast media bearer channel.

Abstract: Techniques for variable length talk permit tone are provided. a request to initiate a Push-to-Talk (PTT) call may be received from a PTT call initiator. A first estimated length of time needed to set up resources for the PTT call may be determined. A second length of time to playout a talk permit tone (TPT) may be determined based on the determined first estimated length of time. An indication may be sent to the PTT call initiator to playout the TPT for the determined second length of time.

Abstract: A system and method for multiplexing data streams in order to optimize network resources for Push-to-talk-over-Cellular (PoC) systems. One or more servers interface to the wireless communications network to perform advanced voice services for one or more mobile units therein, which include a Push-to-Talk-over-Cellular (PoC) call session. Both the servers and the mobile units that use the advanced voice services communicate with each other using control messages within the wireless communications network, and at least one of the servers switches media streams comprised of voice messages for the advanced voice services between the mobile units across the wireless communications network. At least one of the mobile units is a participant in a plurality of PoC call sessions concurrently, and at least the media streams for each of the plurality of the PoC call sessions are multiplexed into a single path.

Abstract: In an embodiment, a method includes: synchronizing service information for a push-to-talk (PTT) client between a central PTT server and an first edge PTT server, the first edge PTT server and the PTT client being in a first network, the central PTT server being in a second network different from the first network; establishing a service session with the PTT client at the first edge PTT server in accordance with the service information, the service session used to conduct a PTT call with the PTT client; registering a first functionality for the PTT call at the first edge PTT server with the central PTT server; and performing the first functionality for the PTT call at the first edge PTT server.

Abstract: An embodiment includes receiving, by a client on a client device, a data change notification. The data change notification indicates a change in data relating to the client at a client data store. The method further includes determining, by the client, a type of the data relating to the client changed at the client data store and determining, by the client, a data synchronization mechanism in accordance with the type of the data relating to the client changed at the client data store. Determining the data synchronization mechanism includes determining when to attempt, by the client, a data synchronization to synchronize data on the client device with the data relating to the client changed at the client data store.

Abstract: A system and method for providing dynamic quality-of-service (QoS) for Push-to-Talk (PTT) services in a wireless communications network. One or more servers interface to the wireless communications network to perform the PTT services for mobile units therein. Both the servers and the mobile units communicate with each other using control messages transmitted across bearers in the wireless communications network, and at least one of the servers transmits media streams comprised of voice messages for the PTT services between the mobile units across the bearers in the wireless communications network. At least one of the servers sets up a dedicated bearer in the wireless communications network for at least one of the mobile units, wherein the dedicated bearer has a specified quality of service (QoS) for transmission of at least the media streams to the mobile unit. The dedicated bearer may be static or dynamic.

Abstract: An embodiment method includes receiving, by a notification service running on a processor, a notification from a first component of a push-to-talk (PTT) platform. The notification is for transmission to a PTT client. The method further includes determining, by the notification service, an access transport type used by the PTT client to communicate with the PTT platform, and selecting, by the notification service, a second component to transmit the notification to the PTT client. Selecting the second component is in accordance with the access transport type used by the PTT client. The method further includes transmitting, by the notification service, the notification to the second component.

Abstract: A method and apparatus for situational awareness driven group communications are provided. In an embodiment, a PTT server platform receives incident information related to an incident. The PTT server platform identifies members of a first response group for responding to the incident based on the incident information, and creates a PTT call group associated with the incident. The PTT server platform configures the client devices associated with the members of the first response group with the first set of QoS parameters, and enables communications among the client devices associated with the members of the first response group.

Abstract: An embodiment method includes discovering, by a user equipment (UE), a plurality of UE-to-Network relays available to the first UE. The UE is located outside a coverage area of a wireless communications network. The method includes receiving, by the first UE, one or more capacity indications from the plurality of UE-to-Network relays and selecting, by the first UE, a first UE-to-Network relay from the plurality of UE-to-Network relays to connect to the wireless communications network in accordance with a relay selection policy and the one or more capacity indications. The method includes connecting, by the first UE, to the first UE-to-Network relay using direct mode communications.

Abstract: A system and method for providing advanced voice services in a wireless communications network. The system also interfaces to an Internet Protocol (IP) network to perform the advanced voice services for mobile units in the IP network and includes a protection mechanism against Voice-over-IP (VoiP) Denial-of-Service (DoS) attacks utilizing Advanced Group Services (AGS).

Abstract: A network-to-network interface (NNI) device, including at least one push-to-talk (PTT) interface adapter, a processor connected to the at least one PTT interface adapter, and a non-transitory computer readable medium connected to the processor. The non-transitory computer readable medium has stored thereon instructions that, when executed by the processor, cause the NNI device to receive a first PTT communication in a first PTT format through the at least one PTT interface adapter from a first PTT system, translate the first PTT communication into a second PTT communication in one or more second PTT formats, and transmit the second PTT communication through the at least one PTT interface adapter to one or more second PTT systems.

Abstract: A system and method to leverage Web Real-Time Communication (WebRTC) for implementing Push-to-Talk (PTT) solutions. One or more servers interface to a communications network to perform advanced voice services for one or more wireless or wired user devices, wherein the advanced voice services include a two-way half-duplex voice call within a group of the user devices comprising a PTT call session. At least one of the user devices communicates with at least one of the servers during the PTT call session using a WebRTC connection, and at least the media streams for the PTT call session are transmitted between the server and the user device using the WebRTC connection.

Abstract: An architecture framework to realize Push-to-X services using cloud-based storage services. Push-to-X messages are transmitted between mobile units by messaging servers. The Push-to-X message may include a short text message contained wholly within the Push-to-X message, or the Push-to-X message may include one or more attachments that comprise multimedia contents, files, or location information, which are stored on storage servers, wherein the Push-to-X message identifies a location for retrieving the attachments from the storage servers. The Push-to-X messages may be sent to a single mobile unit identified by a Mobile Directory Number (MDN) or a group of mobile units identified by a list of MDNs or a Uniform Resource Identifier (URI).

Abstract: In an embodiment, a method includes: synchronizing service information for a push-to-talk (PTT) client between a central PTT server and an first edge PTT server, the first edge PTT server and the PTT client being in a first network, the central PTT server being in a second network different from the first network; establishing a service session with the PTT client at the first edge PTT server in accordance with the service information, the service session used to conduct a PTT call with the PTT client; registering a first functionality for the PTT call at the first edge PTT server with the central PTT server; and performing the first functionality for the PTT call at the first edge PTT server.