Importance

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Abstract

In a packet-switched communications network, each of a plurality of node stations is responsive to a request for a circuit-switched call from a source user terminal and transmits a control packet and a message packet in succession to the other node stations. The control packet contains a source address, a destination address, a unique address and a time slot number identifying the time slot in which the circuit-switched call is to be carried. The message packet contains the same unique address as that sent with the preceding control packet and a plurality of time slots identified by the time slot numbers containing in various control packets. On receiving a message packet having the same unique address as that sent with a previous control packet, a destination station extracts an information signal from the message packet using the time slot number contained in the previous control packet and supplies the extracted signal to a user terminal identified by the destination address.

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First Claim