A VoLTE (Voice over Long-Term Evolution) network comprising 4G (4.sup.th generation) LTE and IMS (Internet Protocol Multimedia Subsystem) networks includes an application server configured to provide message-based notifications to user equipment of a calling party when a previously busy called party is free to accept a new voice call. In an illustrative embodiment, a CCBS (Completion of Communications to Busy Subscriber) service signalling flow described by 3GPP (3.sup.rd Generation Partnership Project) technical specification TS 24.642 is modified to replace an automated CCBS recall (i.e., call back) to the calling party with a notification comprising an SMS (Short Message Service) message. The SMS notification is sent using Session Initiation Protocol (SIP) proxy servers implementing call session control functions (CSCF) in an IMS core that interoperate with an IP Short-Message-Gateway (IP-SM-GW) between the LTE and IMS networks that appears to the IMS core as another application server.

A VoLTE (Voice over Long-Term Evolution) network comprising 4G (4.sup.th generation) LTE and IMS (Internet Protocol Multimedia Subsystem) networks includes an application server configured to provide message-based notifications to user equipment of a calling party when a previously busy called party is free to accept a new voice call. In an illustrative embodiment, a CCBS (Completion of Communications to Busy Subscriber) service signalling flow described by 3GPP (3.sup.rd Generation Partnership Project) technical specification TS 24.642 is modified to replace an automated CCBS recall (i.e., call back) to the calling party with a notification comprising an SMS (Short Message Service) message. The SMS notification is sent using Session Initiation Protocol (SIP) proxy servers implementing call session control functions (CSCF) in an IMS core that interoperate with an IP Short-Message-Gateway (IP-SM-GW) between the LTE and IMS networks that appears to the IMS core as another application server.

Communications channels between systems can be managed such that unnecessary use of the channels is limited. A computer system can initiate a request to establish communications channels between a client device and the computer system. A notification is sent to the client device, which causes the client device to prompt the user to either accept the request or reschedule the requested establishing of the communications channel.

Communications channels between systems can be managed such that unnecessary use of the channels is limited. A computer system can initiate a request to establish communications channels between a client device and the computer system. A notification is sent to the client device, which causes the client device to prompt the user to either accept the request or reschedule the requested establishing of the communications channel.

Systems and methods are described herein for sending notifications associated with different use or active modes of a mobile device, such as a smart phone, tablet, and so on. For example, a mobile device may be in a busy mode, where a user associated with the mobile device is busy on a call, and/or in an entertainment mode (or other non-communication mode), where the user is utilizing entertainment functions provided by the mobile device (e.g., watching a video, playing a video game, listening to a podcast, and so on).

Systems and methods are described herein for sending notifications associated with different use or active modes of a mobile device, such as a smart phone, tablet, and so on. For example, a mobile device may be in a busy mode, where a user associated with the mobile device is busy on a call, and/or in an entertainment mode (or other non-communication mode), where the user is utilizing entertainment functions provided by the mobile device (e.g., watching a video, playing a video game, listening to a podcast, and so on).

Example status prompt multimedia playing methods and apparatus are described. One example method includes receiving a first multimedia request by a status prompt application server, where the first multimedia request includes a non-idle identifier and is sent by a TAS. The status prompt application server sends a first multimedia response including a status prompt multimedia session description protocol (SDP) to the TAS, and receives a first multimedia acknowledgement message that includes a calling-side multimedia SDP and that is sent by the TAS. In this way, the status prompt application server obtains the calling-side multimedia SDP, and implements negotiation and acknowledgement of multimedia capability sets between the status prompt application server and a calling terminal device. The status prompt application server can play corresponding status prompt multimedia for the calling terminal device based on different non-idle identifiers. This implements playing of personalized status prompt multimedia in a non-idle state scenario.

Example status prompt multimedia playing methods and apparatus are described. One example method includes receiving a first multimedia request by a status prompt application server, where the first multimedia request includes a non-idle identifier and is sent by a TAS. The status prompt application server sends a first multimedia response including a status prompt multimedia session description protocol (SDP) to the TAS, and receives a first multimedia acknowledgement message that includes a calling-side multimedia SDP and that is sent by the TAS. In this way, the status prompt application server obtains the calling-side multimedia SDP, and implements negotiation and acknowledgement of multimedia capability sets between the status prompt application server and a calling terminal device. The status prompt application server can play corresponding status prompt multimedia for the calling terminal device based on different non-idle identifiers. This implements playing of personalized status prompt multimedia in a non-idle state scenario.

A method and device for managing a communication between a calling terminal and a called terminal in the event that it is impossible to reach a called terminal during an attempt to establish a communication according to a first mode. The method includes: receiving a message including an identifier associated with the called terminal and an indication according to which the communication cannot be established; obtaining, from identifiers associated with the calling terminal and the called terminal, a host card including at least one piece of information relating to the reachability of the user of the called terminal; transmitting, according to an instant messaging protocol, the obtained response message to the calling terminal, the host card being configured to allow the triggering of a communication according to a mode that is distinct from the first mode.

A method and device for managing a communication between a calling terminal and a called terminal in the event that it is impossible to reach a called terminal during an attempt to establish a communication according to a first mode. The method includes: receiving a message including an identifier associated with the called terminal and an indication according to which the communication cannot be established; obtaining, from identifiers associated with the calling terminal and the called terminal, a host card including at least one piece of information relating to the reachability of the user of the called terminal; transmitting, according to an instant messaging protocol, the obtained response message to the calling terminal, the host card being configured to allow the triggering of a communication according to a mode that is distinct from the first mode.