Abstract: A system, device and method for implementing a special call service are disclosed. The method includes receiving a session establishment request message carrying a service type identifier, determining a service type identified by the service type identifier in the session establishment request message, and implementing a special call service with a service processing logic corresponding to the service type.

Abstract: A method for supporting session mobility, more particularly, a method for supporting session mobility that can move various sessions between two or more devices by using session initiation protocol (SIP). Various sessions can be simultaneously moved by utilizing a SIP PUBLISH message. Accordingly, a user can utilize various services as they are regardless of changing of service receiving device while the user utilizes various services. Also, the session mobility can be effectively supported whether the target of the session movement is known or not.

Abstract: Methods and systems are disclosed for transferring service application data from a server to a subscriber device via the PSTN without establishing a call between the server and subscriber device and without the PSTN switching components having inherent knowledge as to the data content. The server defines a generic request message, which contains the service application data and data delivery instructions. This generic request message is delivered to the subscriber's terminating switch, which subsequently delivers the service application data to the subscriber based on the data delivery instructions. The terminating switch then defines a generic response message and delivers it to the server, informing the server as to status of the data delivery. Similarly, methods and systems are also taught for broadcasting data from a server to a plurality of devices via the PSTN.

Abstract: In a telecommunications network, such as the public switched telephone network, account must be taken of faults which can occur in the network. For instance, on occurrence of a local exchange failure, it is known to apply control such as route gapping and code blocking. The invention is concerned with detection of failure of a local exchange (116, 118) in a communications network. It relies on a combination of parameters, each parameter in the combination having to meet predetermined criteria. In particular, a local exchange failure is recognized when the Bids per Circuit per Hour (BCH) along selected traffic routes exceed a first threshold and the magnitude of a decrease in the average Answer Seizure Ratio (ASR) on selected traffic routes exceeds a second threshold. Controls might be applied to parent or far-end trunk exchanges, and can be removed when the ASR and Percentage Occupancy (OCC) meet further criteria.