| 摘要 |
<p>PURPOSE:To realize the call of telephones all at once every group by constituting the sub-address of each apparatus a hierarchical structure every call group. CONSTITUTION:The eight telephones T1-T8 are divided to the three layers structure of the small group (g11), (g12), (g21) and (g22) and the big group G1 and G2. The sub-addresses are added to these group and a memory means 10 storing the sub-address are provided to the respective telephones. Besides, a comparison means 20 successively comparing the sub-address information of a call signal inputted through an external connection bus, an user's termination device 1 and a bus 2 and the sub-address information of the respective telephones and a control means constituted to make the telephone of the selected group to answer when the comparison by the comparison means is finished are provided. Thus only the apparatus belonging to the prescribed group can be called among the plural apparatus.</p> |
