| 摘要 |
PURPOSE:To prevent the continuation of the one-sided cutting condition of a calling to occur due to the abnormality, etc., in a network and to execute the calling control with a small quantity of malfunction between terminals by transmitting a connecting logical number pair to an opponent exchanging station for a constant period and when the logical number pair is detected which comes to be the one-sided cutting condition, informing of this. CONSTITUTION:An exchanging station to receive logical number pair notice (CSS) packets 22 and 23 collate them with the memory number pair of the self-station and checks whether or not they are coincident. A recovery request (CQ) 12 to complete the communication from a terminal 1 to a terminal 4 is transmitted, the request is vanished by the abnormality in the network on the way of transmission as an inter-station CQ packet 13 from an exchanging station 2 to 3, and then, the exchanging station 3 and the terminal 4 will not recognize the completion of the communication and a calling transmission is not executed at the exchanging station 2 and the terminal 1, the exchanging station 2 transmits a CF packet 17 to the terminal 1 and cancels the calling information after a constant time passes. Thereafter, when the CSS 23 is transmitted from the exchanging station 3, the logical number pair of the calling in one-sided cutting condition recognized to be during communication by the exchanging station 3 is displayed in this, the exchanging station 2 to recognize said fact transmits an one-sided cutting logical number pair notice (CIQ) 25 to the exchanging station 3 and the one-sided cutting logical number pair notice is displayed by a packet identifying information part.
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