The present disclosure relates to an apparatus and a method for managing a Mission Critical Push-to-Talk (MCPTT). The apparatus comprises: a first MCPTT client configured to send an MCPTT request message to a second MCPTT client through a MCPTT server, and receive, from the second MCPTT client through the MCPTT server, a MCPTT response message in response to the MCPTT request message, wherein an MCPTT call in the MCPTT service is established between the first MCPTT client and the second MCPTT client by the MCPTT server.

A virtual queuing system includes a server connected to a call center. The call center includes an automatic call distributor and a firewall. The server maintains virtual queues. User interfaces enqueu a call by a user of the call center to the virtual queues via the server. An application programming interface interfaces the user interfaces to the server. A virtual queuing connector module connects the automatic call distributor of the call center to the application programming interface across the firewall of the call center via requests or pulls initiated by the virtual queuing connector module. The virtual queuing connector module and the automatic call distributor are operated inside the firewall. The server, the application programming interface, and the user interfaces are operated outside the firewall. When a call is up, the call is connected as a prioritized call, assigned to a reserved IVR channel, and put through first.

A method for establishing a temporally following voice connection of a user of a call center facility to the call center facility after a temporally preceding voice connection of the user to the call center facility has been established and has ended, wherein the temporally following voice connection relates to the temporally preceding voice connection, includes: in a first step, the temporally preceding voice connection between the user and the call center facility is established; in a second step that follows the first step, the temporally preceding voice connection is ended; in a third step that follows the second step, a text-oriented message is transmitted to the user, wherein the text-oriented message indicates the possibility of establishing the temporally following voice connection that relates to the temporally preceding voice connection; and in a fourth step that follows the third step, the temporally following voice connection is established.

A method for establishing a temporally following voice connection of a user of a call center facility to the call center facility after a temporally preceding voice connection of the user to the call center facility has been established and has ended, wherein the temporally following voice connection relates to the temporally preceding voice connection, includes: in a first step, the temporally preceding voice connection between the user and the call center facility is established; in a second step that follows the first step, the temporally preceding voice connection is ended; in a third step that follows the second step, a text-oriented message is transmitted to the user, wherein the text-oriented message indicates the possibility of establishing the temporally following voice connection that relates to the temporally preceding voice connection; and in a fourth step that follows the third step, the temporally following voice connection is established.

Exemplary embodiments relate to techniques for connecting two users when a caller places a call but a callee rejects the call or fails to answer in a predetermined period of time. The calling application may terminate the call attempt and request status updates regarding the called party to determine when the callee is available for a follow-up call. The system may gain insight into when a user is available based on the user's presence in a messaging or social networking app, activity in a third-party application unrelated to the call, or the power status of the user's device. When it is determined that the callee is available, a notification may be sent to the caller informing the caller that it is a good time to call back. The techniques may also be used in reverse, informing the callee of when the caller is available for a return call.

Exemplary embodiments relate to techniques for connecting two users when a caller places a call but a callee rejects the call or fails to answer in a predetermined period of time. The calling application may terminate the call attempt and request status updates regarding the called party to determine when the callee is available for a follow-up call. The system may gain insight into when a user is available based on the user's presence in a messaging or social networking app, activity in a third-party application unrelated to the call, or the power status of the user's device. When it is determined that the callee is available, a notification may be sent to the caller informing the caller that it is a good time to call back. The techniques may also be used in reverse, informing the callee of when the caller is available for a return call.

The present disclosure provides a method for processing a system call in a voice call. The method includes: participating, by a first terminal, a voice call with one or more second terminals, the voice call being performed in a non-system voice call application on the first terminal; monitoring, by the first terminal, a system call start event during the voice call; actively stopping, in response to the system call start event, use of an audio device of the first terminal; suspending participation of the first terminal in the voice call; sending, by the first terminal, a voice suspension request to a server to remind the one or more second terminals that the first terminal suspends the voice call; and recovering the voice call when the system call ends.

The present disclosure provides a method for processing a system call in a voice call. The method includes: participating, by a first terminal, a voice call with one or more second terminals, the voice call being performed in a non-system voice call application on the first terminal; monitoring, by the first terminal, a system call start event during the voice call; actively stopping, in response to the system call start event, use of an audio device of the first terminal; suspending participation of the first terminal in the voice call; sending, by the first terminal, a voice suspension request to a server to remind the one or more second terminals that the first terminal suspends the voice call; and recovering the voice call when the system call ends.

Information associated with messages and/or missed calls is provided to a subscriber. Calls received but not answered by the subscriber may be monitored. Each monitored call is classified as one of a missed call and a message. The monitored calls may be summarized based on a customizable rule set to create a summary. The summary is provided to the subscriber via, for example, a voice notification.

Information associated with messages and/or missed calls is provided to a subscriber. Calls received but not answered by the subscriber may be monitored. Each monitored call is classified as one of a missed call and a message. The monitored calls may be summarized based on a customizable rule set to create a summary. The summary is provided to the subscriber via, for example, a voice notification.