System, methods, nodes, and instruction set for routing a session invitation from a first network (101) to a second network (112) are described. The first network (101) and the second network (112) are interconnected via at least two points of interconnect (114, 120). A first control node (124) receives a session invitation to a first user equipment (106), both are part of the first network (101). The first control node (124) determines whether a breakout condition for routing of the session invitation to the second network (112) is fulfilled. If so, a second control node (128) of the first network (101) selects a point of interconnect (114, 120) to the second network (112), considering a capability information characterizing the first control node (124). Therefore the session invitation may be routed in an efficient way from the first network (101) to the second network (112).

A method of associating multiple user endpoints (UEs) with a single IMS session in an IMS network having a serving node for controlling at least one IMS session for a user and at least a first access network for providing access to UEs. The method involves associating a first UE with the user and with an IMS session; discovering a second UE in a proximity of the first UE; discovering information about the second UE; communicating the information about the second UE to the serving node; the serving node utilizing computer-implemented policy logic to determine whether to associate the second UE with the user and the EMS session; and if the policy logic determines that the second UE is to be associated, the serving node associating the second UE with the IMS session while retaining the association with the first UE.

An embodiment of the system for publishing events of a telephony application to a client includes a call router that generates events from the telephony application and an event router that manages the publication of events generated by the call router and that manages the subscription to events by clients. The system can be used with a telephony application that interfaces with a telephony device and an application server

A system that incorporates teachings of the present disclosure may include, for example, receiving a message transmitted from a web server application operating in a mobile device and inserting an identifier of a gateway device into the message to produce a modified message. The modified message includes a request to invoke a software application in the mobile device. The modified message is forwarded to a remote server to allow the server to establish communications with a media processor based on the identifier of the gateway device. The media processor invokes the software application in the mobile device based on an address supplied by the web server application allowing the mobile device to execute the software application and to establish media communication services with the media processor responsive to executing the software application. Other embodiments are disclosed.

For an incoming session intended for a user element, a domain selection function (DSF) is provided in a multimedia subsystem (MS) to select a circuit-switched subsystem (CS) or MS domain to use when routing the incoming session to the user element. Regardless of the domain in which incoming sessions are originated, the incoming sessions intended for the user element are routed to an S-CSCF in the MS. The S-CSCF directly or indirectly employs the DSF to determine whether to use the MS or the CS for terminating the incoming session. Based on available domain selection criteria, the DSF will select an appropriate domain, such as the MS or CS, to use for routing the incoming session to the user element. The domain selection decision of the DSF is provided to the S-SCSF, which will proceed by routing the incoming session to the user element via the selected domain.

An embodiment of the system for publishing events of a telephony application to a client includes a call router that generates events from the telephony application and an event router that manages the publication of events generated by the call router and that manages the subscription to events by clients. The system can be used with a telephony application that interfaces with a telephony device and an application server.

A link management device with a special function is connected to the IP network, and the link management device controls a process of establishing a link between an IP converter device and a signal transfer point. The IP converter device transmits a request including a point code to the link management device, and the link management device determines the IP address and the like of the signal transfer point as a connection destination from the received point code. The link management device transmits information for identifying the signal transfer point to the IP converter device, and also transmits information for identifying the IP converter device to the signal transfer point as the connection destination. The port number of the IP converter device is determined by the link management device. The port number of the signal transfer point is determined by the link management device.

A mobile device joins a communication session using a data communication channel. A determination is made the data communication channel uses a data network of the mobile device. A determination is made that, during the communication session, a quality of the data communication channel has decreased. In response to determining that the data communication channel uses the data network of the mobile device and determining that the quality of the data communication channel has decreased, a push notification message is sent to a push notification service. The push notification message comprises a cellular network dial-able number that is used by a cellular application in the mobile device to initiate a call to join the communication session via a cellular communication channel that uses a cellular network.

A method of associating multiple user endpoints (UEs) with a single IMS session in an IMS network having a serving node for controlling at least one IMS session for a user and at least a first access network for providing access to UEs. The method involves associating a first UE with the user and with an IMS session; discovering a second UE in a proximity of the first UE; discovering information about the second UE; communicating the information about the second UE to the serving node; the serving node utilizing computer-implemented policy logic to determine whether to associate the second UE with the user and the EMS session; and if the policy logic determines that the second UE is to be associated, the serving node associating the second UE with the IMS session while retaining the association with the first UE.

An embodiment of the system for publishing events of a telephony application to a client includes a call router that generates events from the telephony application and an event router that manages the publication of events generated by the call router and that manages the subscription to events by clients. The system can be used with a telephony application that interfaces with a telephony device and an application server