| 摘要 |
PROBLEM TO BE SOLVED: To attain multiple address communication from a master ISDN terminal to all slave ISDN terminals. SOLUTION: A base station 4 is terminated up to a layer 2 with respect to an ISDN 3, and monitors a layer 3 message from slave stations 5, 6 and from the ISDN 3. Upon the receipt of a call setup request message sent from a master ISDN terminal 1, a Dch message TS and Bch TS are assigned and the base station 4 informs the slave stations 5, 6 about the assignment though a control channel in common to the slave stations to make call setup processing to the master ISDN terminal 1. When the slave stations 5, 6 receive a communication channel setup message from the base station 4, they make call setup processing to slave ISDN terminals 80, 81 and a communication channel is established with the base station through the Dch message TS and the Bch TS. When the slave ISDN terminal makes a call for communication with the master ISDN terminal, the master ISDN terminal makes call setup processing to the slave ISDN terminal and inquires of the base station about the Dch message TS and the Bch TS and a call number to set up a communication channel. |
