| 摘要 |
PURPOSE:To realize add-on calls economically, by using channel trunks which are provided for other calls, such as intra-office trunks, without providing special call trunks exclusively used, such as three-way trunks. CONSTITUTION:When an intra-office trunk IOT.0 in which an extension EXT.A and another extension EXT.B are connected, and the EXT.A requesting an add-on call call out an extension EXT.C for call, an intra-office trunk IOT.1 in which the EXT.A and EXT.C are connected is used as it is, and one terminal of channel of both trunks is duplicatedly connected to the EXT.A and another terminal of the channel of the both trunks is controlled to be connected to the EXT.B and EXT.C, allowing to make three parties' communication among three extensions. |
