| 摘要 |
PURPOSE:To reduce a memory capacity necessary for a Direct Inward Dialing (DiD) service by producing an extension representative group. CONSTITUTION:A private branch exchange consists of an exchange switch (NW) 12, a control device (CC) 11 and a memory 13 etc. and the control device 11 proceeds the exchange switch 12 by a prescribed program process. And in an exchange controlling, a means 110 which converts temporarily a receiving code received from a DiD call to an extension representative group number is providded and when a DiD receiving call is received, an extension representative registration table is indexed by a group number obtained from the conversion means 110 and the receiving call is received by the indexed extension representative. Extension telephone sets 3a-3e consist of one group and the extension telephone set 3a is the representative telephone set of the group. Thus, by consisting an incoming extension representative group, the constitution of a conversion table to a group number is simplified and a registration table is reduced by making the extension telephone sets into a group. Therefore, the reduction of whole of the memory capacity necessary for the DiD service is realized. |
