Abstract: A method includes transmitting time-critical messages in an OSI layer 2 network tunnel from a first IED in a first substation to a second IED in a second substation over a WAN, wherein each of the first and second substation comprises an edge IED and is associated with a substation LAN, wherein each of the time-critical messages comprises message parameters. The method includes: creating a translation table comprising corresponding values of the message parameters, between the LANs and the WAN; defining a virtual IED in the second substation using the translated values of the message parameters, to impersonate the first IED; translating the message parameters according to the translation table, by the edge IED of the first and second substation; forwarding the time-critical messages from the first IED in the first substation to the WAN; and receiving the time-critical messages by the second IED in the second substation from the WAN.

Abstract: The present invention discloses a method of transmitting time-critical messages in an OSI layer 2 network tunnel from a first TED in a first substation to a second IED in a second substation over a WAN, wherein each of the first and second substation comprises an edge IED and is associated with a substation LAN, wherein each of the time-critical messages comprises message parameters. The method comprises the steps of: a) creating a translation table comprising corresponding values of the message parameters, between the LANs and the WAN, b) defining a virtual FED in the second substation using the translated values of the message parameters, to impersonate the first IED, c) translating the message parameters according to the translation table, by the edge IED of the first and second substation, d) forwarding the time-critical messages from the first IED in the first substation to the WAN, and e) receiving the time-critical messages by the second IED in the second substation from the WAN.

Abstract: A method of providing information relating to a telephone call, in a GSM cellular radio telephone network, to a data storage system. The method comprises receiving caller identity information at a Mobile Switching Centre (MSC) of the network during a call set-up procedure between a mobile station and the MSC and storing the information at least temporarily at the MSC. An incoming call alert message is sent by the MSC to a called device. In the event that the called device answers or otherwise accepts the incoming call alert, a call answer message is sent to the MSC. In response to receipt of the call answer message, at least the received and stored caller identity information is output from the MSC to the data storage system.