Abstract: For quickly restoring a previously set up call between first and second terminals associated respectively with first and second call servers, a first call string associated with the first terminal and with a first context of the call previously stored in the first server is created. A call restoring request including a second call string reference extracted from the first context is transmitted from the first to the second server. In the second server, a second call string is searched depending on the reference included in the request. If the second string is found in association with the second terminal, call restoring between the first and the second terminals through a path between the first and the second call strings is confirmed from the second server to the first server.

Abstract: System access points are located either in a packet transmission network or at switching unit interfaces provided with gateways with the packet network. Call servers store context data concerning terminals connected to the system through the access points and cooperate with a configuration manager in order to establish communication paths between different access points.

Abstract: Access points of a system are located either in a packet transmission network or at interfaces connecting switching units provided with gateways with the packet network. Call servers store context data concerning terminals connected to the system through the access points. When a communication path is set up through a gateway to connect first and second terminals, the servers associate an addressing resource of the gateway in the packet network with a portion of the path providing the connection with the first terminal and an addressing resource of the gateway in the switching means with a second portion providing the connection with the second terminal, and store, in the context data concerning the second terminal, an identification of said addressing resource of the gateway in the packet network.

Abstract: To record a call between a calling terminal and a called terminal in a telecommunication network, on a call server (12) to which is linked a recording device (16), a setup request (301, 602) is received which indicates a call profile of the calling terminal and an identifier of the called terminal. An initiation message (303, 603) is transmitted to the device which indicates the call profile of the calling terminal. A setup request (306, 607) is then transmitted to the called terminal, indicating a call profile of the device. A setup response (309, 608) is received from the called terminal indicating a call profile of the called terminal. An update message (311, 611) is then transmitted to the device indicating the call profile of the called terminal and a response (314, 609) is transmitted to the calling terminal indicating a call profile of the device.

Abstract: A call server, a media gateway and terminals are connected to a packet switching network. Other terminals are connected to the gateway interfaces. The method for setting up communication includes generating a call processing task for the calling terminal in the call server, transmitting by the task a connection set-up message including at least an identifier of the called terminal and a first network address enabling to reach the calling terminal, generating a call processing task for the called terminal, and sending, based on the task to a second network address enabling to reach the called terminal, signaling data indicating in particular the first network address. When the first and second network addresses are identical and correspond to a gateway address, the latter sets up between the two terminals a communication path which does not pass through the network.

Abstract: In a packet switching data transmission network on the one hand, and in a public telephone network on the other hand, a station (14) is started, the networks being interconnected via a call server (15). The transmission network comprises an administration server (11), a plurality of subnets administered by the administration server and a plurality of stations (14), each linked to a subnet. The administration server stores a respective location information for each subnet. A station emits a lease request (301), destined for the administration server. Then, the station receives from the administration server, in response to the lease request, a lease (302) containing the location information of the subnet of the station. Next, the station emits, destined for the call server, a registration request (304) comprising an identifier of the station as well as the location information.