| 摘要 |
PROBLEM TO BE SOLVED: To realize efficient bulk connection using a representative extension, in which one trunk line number can connect many incoming calls when a bulk connection terminal capable of high speed communication interconnects a trunk line and an extension in a private branch of automatic exchange. SOLUTION: A calling setup request SETUP set in an ISDN information storage memory is converted into an incoming request extension number (S1). When the incoming request extension number indicates a bulk connection terminal (S2), whether or not there are disagreements between a required B channel and an already incoming call B channel is discriminated (S3). When there is not already received call when both disagree, a flowβis transited and a call receiving destination is decided as a new incoming call. Meanwhile, when there is an incoming call where the both are dissident, it is discriminated that there is an additional channel wait bulk connection terminal and the caller number of the already received incoming call is compared with that of this incoming call (S4-S6). When both the caller numbers agree, the call reception destination of the same extension is decided (S8, S9). The comparison in the S6 is applied to all incoming calls in an additional channel wait state.
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