Abstract: A method and apparatus for handling trust in an IP Multimedia Subsystem network. A node in the IP Multimedia Subsystem network receives a Session Initiation Protocol message from a remote node. The message includes an indicator indicating the level of trust of a communication sent from the remote node to the IP Multimedia Subsystem node. The node can then apply a security policy to the message, the security policy being determined by the indicator.

Abstract: A technique for handling an access from a user equipment (110) accessing an application function (150) is provided. As to a method aspect of the technique, the access is received via a packet core network (140) of a mobile telecommunications network (100). The application function (150) determines that the access from the user equipment (110) fulfills a predefined access pattern. The application function (150) triggers sending of a control message to the packet core network (140) in response to the determination. The control message controls the packet core network (140) to terminate a session with the user equipment (110).

Abstract: A method and apparatus for transferring a session from a packet switched access network to a circuit switched access network. A Mobility Management Entity receives a service type indicator from a gateway node. The service type indicator indicates a type of service for the session, and is associated with bearers used for the session. The Mobility Management Entity subsequently receives, from an eNodeB, an indication that the session is to be transferred from the packet switched network to the circuit switched access network. The Mobility Management Entity determines the bearers associated with the session using the service type indicator, and initiates transfer of the session using those bearers. This ensures that the correct bearers are transferred regardless of whether or not identifiers such as QCI values have been ascribed to other types of service.

Abstract: A method is proposed for providing a mobile terminal associated with a user with access to a visited Internet Protocol based mobile communication network. The mobile terminal generates a network information element that comprises a home network identifying element that identifies a home network of the user, and a domain name of the visited IP based mobile communication network as a base domain identifier. The mobile terminal then provides this special network information element to visited IP based mobile communication network, which executes a subscription generating procedure for generating a subscription for the user upon recognizing the special network information element and provides the mobile terminal access based on the generated subscription.

Abstract: Dual Radio Access Transfer of an IMS in an alerting phase for the Packet Switched to Circuit Switched direction includes initiating an IMS media session towards UE and, during a session alerting phase, making a determination that a DRVCC transfer is required from a PS to CS, access, sending a SIP message from the UE to a SCC-AS, over the PS access, informing the SCC-AS of the DRVCC transfer, and responding to receipt of the SIP message at the SCC-AS by sending a SIP INVITE from the SCC-AS towards MSC. The SIP INVITE includes an identity of the UE as a called party identity and the STN as the calling party identity. The Transfer includes sending from the MSC to the UE a CS Setup message, whereupon the MSC is placed in a state in which it expects a CS Answer from the UE.

Abstract: A method is provided for use in a communication system that includes a first terminal and an emergency center. The method includes transmitting, by a second terminal, an indicator indicating that emergency service is required for the first terminal, and automatically establishing a call session between the first terminal and the emergency center in response to the indicator.

Abstract: An IMS (IP Multimedia Subsystem) network contains at least one of (A) a discovery function (2) for providing ISIM (IP Multimedia Subscriber Identity Module) discovery information to the mobile device (1) and (B) a provisioning function (2, 5, 6) for providing, in response to a request from a mobile device, an ISIM to the mobile device (1). Where the IMS network contains the discovery function, the discovery function is adapted to provide ISIM discovery information to the mobile device, and where the IMS network contains the provisioning function, the provisioning function is adapted to provide an ISIM to the mobile device (1).

Abstract: Techniques and apparatus are described for controlling set up of a terminating call from an IMS to a UE, in a Circuit Switched Fallback (CSFB) situation. A first MSC receives a terminating call from IMS and tries to page the UE. The UE has moved to the second MSC and performs a Location Update to the second MSC. The second MSC informs the first MSC with a Send Identification message comprising an address of the second MSC. The first MSC maintains the IMS subscription of the UE at Cancel Location and forwards the terminating call to the second MSC. The first MSC acts as relay for subsequent call control messages for calls of the UE. The first and second MSCs are supervising the ongoing calls and as soon as all calls are completed the second MSC registers the UE into IMS and the first MSC de-registers the UE from IMS.

Abstract: A method and apparatus for key management in a communication network. A Key Management Server (KMS) receives from a first device a request for a token associated with a user identity, the user identity being associated with a second device. The KMS then sends the requested token and a user key associated with the user to the first device. The KMS subsequently receives the token from the second device. A second device key is generated using the user key and a modifying parameter associated with the second device. The modifying parameter is available to the first device for generating the second device key. The second device key is then sent from the KMS to the second device. The second device key can be used by the second device to authenticate itself to the first device, or for the first device to secure communications to the second device.

Abstract: Methods and apparatuses for updating policy and charging rules relating to early dialogs in session initiation protocol forking in a telecommunications network. A node comprises a receiver (304), configured to receive a plurality of preliminary responses originating from a plurality of terminating end points as part of Session Initiation Protocol, SIP, forking. The node comprises an early dialog controller (314), configured, for each received preliminary response, to determine a unique identifier and to control a transmitting means, which may be a transmitter (302), to transmit a corresponding preliminary message comprising the unique identifier to a further node (400) for use as a Policy and Charging Rules Function, PCRF (200), for creating an early dialog by the further node. The receiver is further configured to receive updated data for at least one of the preliminary responses.

Abstract: A method of synchronising streaming media between a plurality of UEs connected to a communications network, wherein the UEs are involved in a SIP-enabled voice session over said communications network. A timestamp is provided to each of the UEs. Each of the UEs then sends a request for streamed media to an IPTV service, receives streamed media from the IPTV service, and commences playout of the streamed media in dependence upon the timestamp.

Abstract: A method of registering a subscriber in an IP Multimedia Subsystem (IMS) is provided, wherein the method is executed by a call control node (800), wherein the method comprises receiving (402) an access request of the subscriber for circuit switched accessing the IMS, the access request being received via an access, determining (404) an access type of the access, and sending (406) a registration request for circuit switched registering the subscriber in the IMS depending on the determined access type.

Abstract: A method for improving session continuity for a terminal (204?) in a serving communication network (202?) distinct from a home communication network (200?) of the terminal (204?), wherein the serving communication network (202?) comprises a session transfer node (208?) for transferring sessions each comprising signaling data and media data from a first access network (210?) of the serving communication network (202?) to a second access network (212?) of the serving communication network (202?) comprises the following: Routing signaling data of a session of the terminal (204?) between the first access network (210?) and the home communication network (200?) via the session transfer node (208?) in the serving communication network (202?), receiving a session transfer request requesting the transfer of the session from the first access network (210?) to the second access network (212?) for the terminal (204?), and transferring the session from the first access network (210?) to the second access network (212?),

Abstract: A method performs a Single Radio Voice Call Continuity (SRVCC) Packet Switched (PS) to Circuit Switched (CS) handover of an emergency call that is routed over an IP Multimedia Subsystem (IMS) network. The call is transferred from a first region served by a first Mobility Management Entity (MME) to a second region served by a second MME. The method includes sending a first handover request from the first MME to the second MME to transfer the call. The first handover request includes an Emergency Session Transfer Number for SRVCC (E-STN-SR) identifying an Emergency Access Transfer Function (EATF) in the first region. A second handover request for handover to a CS access is sent to a target Mobile Switching Centre, MSC, and includes the E-STN-SR. The call is handed over to the CS access using the E-STN-SR to route the call via the EATF in the first region.

Abstract: In a mobile network with a plurality of access networks, a control node controls access of a user equipment to that one of the access networks which is currently used by the user equipment. The control node determines an access capability of the user equipment in the access network. The access capability includes whether an IP Multimedia Subsystem (IMS) voice over Packet Switched (PS) session is supported. The control node provides an indication of the determined access capability to a Home Subscriber Server (HSS) associated with the user equipment. The indication may then be retrieved from the HSS and used to control termination of a connection to the user equipment.

Abstract: A method of operating an emergency call procedure in a telecommunications network includes storing, for a user of an IMS network, emergency contact Uniform Resource Identifiers (URIs) of one or more emergency contacts of the user who may be contacted by emergency services in the event of an emergency call from the user. The method also includes receiving an emergency call from the user and providing the emergency contact URIs to a Public Safety Answering Point, PSAP.

Abstract: An apparatus configured to operate as a Backup system in a Data Layered Architecture Public Land Mobile Network. The apparatus comprises an interface for enabling a data exchange between the apparatus and a plurality of Authentication Centre Front Ends, and a memory for storing subscriber authentication data. The apparatus further comprises a processor for detecting a failure of a Data Back End and for receiving a redirected authentication data set request from an Authentication Centre Front End via the interface. The processor is further configured, in the event of a detected failure of Data Back End, to generate one or more authentication data sets in response to the request using the data stored in the memory, and send the generated data set(s) to the Authentication Centre Front End via the interface.

Abstract: A method and arrangement is disclosed for managing session keys for secure communication between a first and at least a second user device in a communications network. The method is characterized being independent of what type of credential each user device implements for security operations. A first user receives from a first key management server keying information and a voucher and generates a first session key. The voucher is forwarded to at least a responding user device that, with support from a second key management server communicating with the first key management server, resolves the voucher and determines a second session keys. First and second session keys are, thereafter, used for secure communication. In one embodiment the communication traverses an intermediary whereby first and second session keys protect communication with respective leg to intermediary.

Abstract: A method of routing a session from a calling party in a serving communication network of the calling party to a called party is described. The serving communication network of the calling party is distinct from a home communication network of the calling party. The method is executed by a session routing node in the serving communication network of the calling party. In order to optimize a session routing path of signaling data of the session, the method comprises receiving from the home communication network of the calling party a session routing request requesting routing the signaling data of the session to the called party via the serving communication network of the calling party, and routing the signaling data of the session to the called party via the serving communication network of the calling party based on the received session routing request.

Abstract: A method and apparatus for handling emergency signalling in an IP Multimedia Subsystem network. A Proxy-Call Session Control Function receives a message requesting set up of a session. The message is associated with an IP Multimedia Private Identity. The P-CSCF determines that the message relates to an emergency call. If an emergency override tag associated with the IMPI is provisioned or set at the P-CSCF, then the message is forwarding the SIP message to a Serving-Call Session Control Function (S-CSCF) for further handling. However, if an emergency override tag associated with the IMPI is not provisioned or set at the P-CSCF, the message is forwarded to an Emergency-Call Session Control Function (E-CSCF). The invention allows the P-CSCF to exercise control over the handling of emergency signalling.