| 摘要 |
<p>PURPOSE:To improve the usability of communication and the effectivity of channel use by providing a means to give a priority to communication from respective terminals to a sub address, which is respectively allocated to the plural terminals, and to compare the priority of the communication. CONSTITUTION:Call incoming information to D-channel packet call originating are announced from a station exchange 32 to respective terminals (1)-(8)1. Even in the terminals (2) and (3)1 to just execute the communication, it is judged that the call incoming is not addressed to its own terminal since the incoming sub address does not designate its own terminal. Continuously, in a control channel monitor part 12d, the outgoing ISDN number of the information and an incoming ISDN number are compared and by the coincidence of both numbers, it is recognized that these incoming information are not a communication request from the terminal of another normal subscriber line but sound whether interruption can be preferentially executed or not since the terminal 1 to be connected to the same subscriber line 2 desires to execute the communication by using a B channel however, the said B channel is not idle.</p> |
