公开(公告)号：US20020044571A1

公开(公告)日：2002-04-18

申请号：US09968915

申请日：2001-10-03

Applicant: ALCATEL

Inventor： Xavier Penet

IPC: H04J003/07

CPC classification number: H04Q1/10 ,  H04M7/006 ,  H04Q1/025 ,  H04Q3/625 ,  H04Q11/04 ,  H04Q2201/04 ,  H04Q2201/806 ,  H04Q2213/13003 ,  H04Q2213/13103 ,  H04Q2213/13106 ,  H04Q2213/13107 ,  H04Q2213/13178 ,  H04Q2213/13214 ,  H04Q2213/1322 ,  H04Q2213/13292 ,  H04Q2213/13299 ,  H04Q2213/13305 ,  H04Q2213/1332 ,  H04Q2213/13322 ,  H04Q2213/1336 ,  H04Q2213/13396

Abstract: The present invention concerns a modular expandable telecommunication system, such as a private automatic branch exchange system (PABX), comprising a main cabinet and at least one expansion cabinet, which are interconnected with each other in order to obtain an extended telecommunication system with increased connection possibilities for extensions and trunks. System characterized in that the main cabinet and each of the expansion cabinet comprise a transmission interface unit allowing connection of the said expansion cabinet(s) with said main cabinet via a single transmission link conveying voice/data channels and low level or local signaling for performing at least mutual synchronization and clock recovery for all interconnected cabinets, the main cabinet comprising in particular a master clock device, a CPU for running the application and a DSP for routing the higher level messages issued by the CPU depending on the physical location of the destination cabinet.

Abstract translation: 本发明涉及一种诸如专用自动分支交换系统（PABX）的模块化可扩展电信系统，包括主柜和至少一个扩展柜，它们彼此互连以便获得具有增加的连接的扩展电信系统 扩展和中继的可能性。 系统特征在于，主柜和每个扩展柜包括传输接口单元，允许通过传送语音/数据信道的单个传输链路和所述扩展柜与所述主柜连接的低级或本地信令来执行 至少对于所有互连机柜的相互同步和时钟恢复，主机柜特别包括主时钟装置，用于运行应用程序的CPU和用于根据目的地的物理位置路由由CPU发出的较高级别消息的DSP 内阁。

公开(公告)号：EP1198144B1

公开(公告)日：2007-04-18

申请号：EP00440276.4

申请日：2000-10-13

Applicant: Alcatel Lucent

Inventor： Penet, Xavier

IPC: H04Q3/62 ,  H04Q1/10 ,  H04Q11/04

CPC classification number: H04Q1/10 ,  H04M7/006 ,  H04Q1/025 ,  H04Q3/625 ,  H04Q11/04 ,  H04Q2201/04 ,  H04Q2201/806 ,  H04Q2213/13003 ,  H04Q2213/13103 ,  H04Q2213/13106 ,  H04Q2213/13107 ,  H04Q2213/13178 ,  H04Q2213/13214 ,  H04Q2213/1322 ,  H04Q2213/13292 ,  H04Q2213/13299 ,  H04Q2213/13305 ,  H04Q2213/1332 ,  H04Q2213/13322 ,  H04Q2213/1336 ,  H04Q2213/13396

公开(公告)号：EP1133194B1

公开(公告)日：2009-06-17

申请号：EP01105663.7

申请日：2001-03-07

Applicant: Tenovis GmbH & Co. KG

Inventor： Bartel, Manfred ,  Breitbach-Hitzel, Gabriele ,  Villmow, Andre

IPC: H04Q1/10

CPC classification number: H04Q1/10 ,  H04M2201/16 ,  H04M2201/38 ,  H04Q2201/04 ,  H04Q2201/806

公开(公告)号：EP1133194A3

公开(公告)日：2004-10-13

申请号：EP01105663.7

申请日：2001-03-07

Applicant: Tenovis GmbH & Co. KG

Inventor： Bartel, Manfred ,  Breitbach-Hitzel, Gabriele ,  Villmow, Andre

IPC: H04Q1/10

CPC classification number: H04Q1/10 ,  H04M2201/16 ,  H04M2201/38 ,  H04Q2201/04 ,  H04Q2201/806

Abstract: Es wird ein elektrisches Gerät und ein Verfahren zum Betrieb eines elektrischen Gerätes vorgeschlagen, das geeignet ist, mehrere Baugruppen durch Schaltmittel von einer ersten Baugruppe aus zu schalten bzw. zu konfigurieren.

Abstract translation: 该建议是针对一种用于操作电气设备的电气设备和方法，其适用于通过开关装置从第一模块切换或配置多个模块。

公开(公告)号：US06633631B2

公开(公告)日：2003-10-14

申请号：US09870452

申请日：2001-06-01

Applicant: Toshiaki Tanaka ,  Hiroshi Mano ,  Setsuo Kimura ,  Yoshihito Nagano ,  Masayuki Tsurusaki ,  Takashi Watanabe ,  Terunori Suwa ,  Isaku Komuro ,  Yoshihiro Kawauchi ,  Nobuhiro Masaki

Inventor： Toshiaki Tanaka ,  Hiroshi Mano ,  Setsuo Kimura ,  Yoshihito Nagano ,  Masayuki Tsurusaki ,  Takashi Watanabe ,  Terunori Suwa ,  Isaku Komuro ,  Yoshihiro Kawauchi ,  Nobuhiro Masaki

IPC: H04M124

CPC classification number: H04Q3/625 ,  H04M1/57 ,  H04M3/22 ,  H04M3/26 ,  H04M3/42 ,  H04M3/42059 ,  H04M3/42127 ,  H04M3/42195 ,  H04M3/42314 ,  H04M3/42323 ,  H04M3/428 ,  H04M3/4283 ,  H04M3/533 ,  H04M3/58 ,  H04M9/00 ,  H04M9/002 ,  H04M2201/38 ,  H04M2207/08 ,  H04M2242/22 ,  H04Q1/028 ,  H04Q1/10 ,  H04Q3/545 ,  H04Q3/58 ,  H04Q11/0407 ,  H04Q2201/10 ,  H04Q2201/806 ,  H04Q2213/13003 ,  H04Q2213/13034 ,  H04Q2213/13036 ,  H04Q2213/13076 ,  H04Q2213/1308 ,  H04Q2213/13091 ,  H04Q2213/13093 ,  H04Q2213/13096 ,  H04Q2213/13097 ,  H04Q2213/13102 ,  H04Q2213/13103 ,  H04Q2213/13106 ,  H04Q2213/1315 ,  H04Q2213/13152 ,  H04Q2213/1316 ,  H04Q2213/13162 ,  H04Q2213/13173 ,  H04Q2213/13174 ,  H04Q2213/13175 ,  H04Q2213/1318 ,  H04Q2213/13196 ,  H04Q2213/13199 ,  H04Q2213/13201 ,  H04Q2213/13203 ,  H04Q2213/13204 ,  H04Q2213/13209 ,  H04Q2213/13213 ,  H04Q2213/13216 ,  H04Q2213/1322 ,  H04Q2213/13242 ,  H04Q2213/13251 ,  H04Q2213/1326 ,  H04Q2213/13282 ,  H04Q2213/13292 ,  H04Q2213/13299 ,  H04Q2213/13302 ,  H04Q2213/13305 ,  H04Q2213/1332 ,  H04Q2213/13322 ,  H04Q2213/13334 ,  H04Q2213/1334 ,  H04Q2213/13362 ,  H04Q2213/13377 ,  H04Q2213/13392 ,  H04Q2213/13405

Abstract: According to this invention, a digital key telephone system connected to an analog public network NW having a function of transmitting a ringing signal including identification information of a calling line through a subscriber line (CO line), accommodating a plurality of extension lines each connected to a digital key telephone (DKT) 2 or a standard telephone (STT) 4 as an extension terminal, and having a function of switching and connecting the subscriber line to the plurality of extension lines or the extension lines to each other includes a called party storage means storing, in advance, information representing the correlation between the calling line and the extension terminals 2 and 4 as a called terminal. When a ringing signal arrives from the analog communication network NW, calling line identification information (caller ID) contained in the ringing signal is detected by a calling line identification information interface unit (RCIU) 12. A control unit (RCTU) 16 determines the called extension terminal on the basis of the detected caller ID and the information stored in the storage means, so the extension terminal receives the call from the digital key telephone interface unit (RDKU) 13 or a standard telephone interface unit (RSTU) 15.

Abstract translation: 根据本发明，一种连接到具有通过用户线（CO线）发送包括呼叫线路的识别信息的振铃信号的功能的模拟公网NW的数字电话系统，其容纳多条延长线，每条延长线连接到 作为分机终端的数字电话（DKT） 2 或标准电话（STT） 4 将用户线路与多个分机线路或分机线路交换和连接的功能彼此包括：被叫方存储装置预先存储表示主叫线路与分机终端 之间的相关性的信息， 2 和 4 作为被叫终端。 当振铃信号从模拟通信网络NW到达时，由呼叫线路识别信息接口单元（RCIU） 12检测振铃信号中包含的呼叫线路识别信息（呼叫者ID）。 根据检测到的呼叫者ID和存储在存储装置中的信息，控制单元（RCTU） 16 确定被叫分机终端，因此 分机终端从数字电话接口单元（RDKU） 13 或标准电话接口单元（RSTU） 15接收呼叫。

公开(公告)号：US06373924B2

公开(公告)日：2002-04-16

申请号：US09870682

申请日：2001-06-01

Applicant: Toshiaki Tanaka ,  Hiroshi Mano ,  Setsuo Kimura ,  Yoshihito Nagano ,  Masayuki Tsurusaki ,  Takashi Watanabe ,  Terunori Suwa ,  Isaku Komuro ,  Yoshihiro Kawauchi ,  Nobuhiro Masaki

Inventor： Toshiaki Tanaka ,  Hiroshi Mano ,  Setsuo Kimura ,  Yoshihito Nagano ,  Masayuki Tsurusaki ,  Takashi Watanabe ,  Terunori Suwa ,  Isaku Komuro ,  Yoshihiro Kawauchi ,  Nobuhiro Masaki

IPC: H04M124

CPC classification number: H04Q3/625 ,  H04M1/57 ,  H04M3/22 ,  H04M3/26 ,  H04M3/42 ,  H04M3/42059 ,  H04M3/42127 ,  H04M3/42195 ,  H04M3/42314 ,  H04M3/42323 ,  H04M3/428 ,  H04M3/4283 ,  H04M3/533 ,  H04M3/58 ,  H04M9/00 ,  H04M9/002 ,  H04M2201/38 ,  H04M2207/08 ,  H04M2242/22 ,  H04Q1/028 ,  H04Q1/10 ,  H04Q3/545 ,  H04Q3/58 ,  H04Q11/0407 ,  H04Q2201/10 ,  H04Q2201/806 ,  H04Q2213/13003 ,  H04Q2213/13034 ,  H04Q2213/13036 ,  H04Q2213/13076 ,  H04Q2213/1308 ,  H04Q2213/13091 ,  H04Q2213/13093 ,  H04Q2213/13096 ,  H04Q2213/13097 ,  H04Q2213/13102 ,  H04Q2213/13103 ,  H04Q2213/13106 ,  H04Q2213/1315 ,  H04Q2213/13152 ,  H04Q2213/1316 ,  H04Q2213/13162 ,  H04Q2213/13173 ,  H04Q2213/13174 ,  H04Q2213/13175 ,  H04Q2213/1318 ,  H04Q2213/13196 ,  H04Q2213/13199 ,  H04Q2213/13201 ,  H04Q2213/13203 ,  H04Q2213/13204 ,  H04Q2213/13209 ,  H04Q2213/13213 ,  H04Q2213/13216 ,  H04Q2213/1322 ,  H04Q2213/13242 ,  H04Q2213/13251 ,  H04Q2213/1326 ,  H04Q2213/13282 ,  H04Q2213/13292 ,  H04Q2213/13299 ,  H04Q2213/13302 ,  H04Q2213/13305 ,  H04Q2213/1332 ,  H04Q2213/13322 ,  H04Q2213/13334 ,  H04Q2213/1334 ,  H04Q2213/13362 ,  H04Q2213/13377 ,  H04Q2213/13392 ,  H04Q2213/13405

Abstract: According to this invention, a digital key telephone system connected to an analog public network NW having a function of transmitting a ringing signal including identification information of a calling line through a subscriber line (CO line), accommodating a plurality of extension lines each connected to a digital key telephone (DKT) 2 or a standard telephone (STT) 4 as an extension terminal, and having a function of switching and connecting the subscriber line to the plurality of extension lines or the extension lines to each other includes a called party storage means storing, in advance, information representing the correlation between the calling line and the extension terminals 2 and 4 as a called terminal. When a ringing signal arrives from the analog communication network NW, calling line identification information (caller ID) contained in the ringing signal is detected by a calling line identification information interface unit (RCIU) 12. A control unit (RCTU) 16 determines the called extension terminal on the basis of the detected caller ID and the information stored in the storage means, so the extension terminal receives the call from the digital key telephone interface unit (RDKU) 13 or a standard telephone interface unit (RSTU) 15.

公开(公告)号：US20010024493A1

公开(公告)日：2001-09-27

申请号：US09870486

申请日：2001-06-01

Applicant: Kabushiki Kaisha Toshiba

Inventor： Toshiaki Tanaka ,  Hiroshi Mano ,  Setsuo Kimura ,  Yoshihito Nagano ,  Masayuki Tsurusaki ,  Takashi Watanabe ,  Terunori Suwa ,  Isaku Komuro ,  Yoshihiro Kawauchi ,  Nobuhiro Masaki

IPC: H04M001/56 ,  H04M015/06 ,  H04M001/00

CPC classification number: H04Q3/625 ,  H04M1/57 ,  H04M3/22 ,  H04M3/26 ,  H04M3/42 ,  H04M3/42059 ,  H04M3/42127 ,  H04M3/42195 ,  H04M3/42314 ,  H04M3/42323 ,  H04M3/428 ,  H04M3/4283 ,  H04M3/533 ,  H04M3/58 ,  H04M9/00 ,  H04M9/002 ,  H04M2201/38 ,  H04M2207/08 ,  H04M2242/22 ,  H04Q1/028 ,  H04Q1/10 ,  H04Q3/545 ,  H04Q3/58 ,  H04Q11/0407 ,  H04Q2201/10 ,  H04Q2201/806 ,  H04Q2213/13003 ,  H04Q2213/13034 ,  H04Q2213/13036 ,  H04Q2213/13076 ,  H04Q2213/1308 ,  H04Q2213/13091 ,  H04Q2213/13093 ,  H04Q2213/13096 ,  H04Q2213/13097 ,  H04Q2213/13102 ,  H04Q2213/13103 ,  H04Q2213/13106 ,  H04Q2213/1315 ,  H04Q2213/13152 ,  H04Q2213/1316 ,  H04Q2213/13162 ,  H04Q2213/13173 ,  H04Q2213/13174 ,  H04Q2213/13175 ,  H04Q2213/1318 ,  H04Q2213/13196 ,  H04Q2213/13199 ,  H04Q2213/13201 ,  H04Q2213/13203 ,  H04Q2213/13204 ,  H04Q2213/13209 ,  H04Q2213/13213 ,  H04Q2213/13216 ,  H04Q2213/1322 ,  H04Q2213/13242 ,  H04Q2213/13251 ,  H04Q2213/1326 ,  H04Q2213/13282 ,  H04Q2213/13292 ,  H04Q2213/13299 ,  H04Q2213/13302 ,  H04Q2213/13305 ,  H04Q2213/1332 ,  H04Q2213/13322 ,  H04Q2213/13334 ,  H04Q2213/1334 ,  H04Q2213/13362 ,  H04Q2213/13377 ,  H04Q2213/13392 ,  H04Q2213/13405

Abstract: According to this invention, a digital key telephone system connected to an analog public network NW having a function of transmitting a ringing signal including identification information of a calling line through a subscriber line (CO line), accommodating a plurality of extension lines each connected to a digital key telephone (DKT) 2 or a standard telephone (STT) 4 as an extension terminal, and having a function of switching and connecting the subscriber line to the plurality of extension lines or the extension lines to each other includes a called party storage means storing, in advance, information representing the correlation between the calling line and the extension terminals 2 and 4 as a called terminal. When a ringing signal arrives from the analog communication network NW, calling line identification information (caller ID) contained in the ringing signal is detected by a calling line identification information interface unit (RCIU) 12. A control unit (RCTU) 16 determines the called extension terminal on the basis of the detected caller ID and the information stored in the storage means, so the extension terminal receives the call from the digital key telephone interface unit (RDKU) 13 or a standard telephone interface unit (RSTU) 15.

公开(公告)号：US06973177B2

公开(公告)日：2005-12-06

申请号：US10257797

申请日：2002-02-19

Applicant: Hiroshi Mori ,  Masashi Furuno ,  Kazuyuki Sato

Inventor： Hiroshi Mori ,  Masashi Furuno ,  Kazuyuki Sato

IPC: H04Q1/02 ,  H04Q1/04 ,  H04Q1/10 ,  H05K7/14 ,  H04M5/00

CPC classification number: H04Q1/10 ,  H04Q2201/10 ,  H04Q2201/806 ,  H05K7/1448

Abstract: Disclosed is a private branch exchange (PBX) that offers high efficiency in wiring cables, at the same time, protects cables in highly safety manner. The PBX includes a PBX section and a casing that covers and holds the PBX section. The casing contains an inner-bottom plate, a support column, and a pedestal. Cables for connections with external circuitry can be connected to the PBX section on the front side of the interior of the casing. The inner-bottom plate holds the bottom of the portion of the casing on which the PBX section is accommodated. The support column is disposed on the lower surface of the inner-bottom plate. Disposed beneath the support column, the pedestal holds the entire of the casing. The support column has a curved surface on the front side, protecting cables wired between the inner-bottom plate and the pedestal.

Abstract translation: 公开了一种提供高效布线电缆的专用交换机（PBX），同时以高度安全的方式保护电缆。 集团电话包括一个集团电话部分和一个覆盖并保持集团电话部分的外壳。 壳体包含内底板，支撑柱和基座。 用于与外部电路连接的电缆可以连接到外壳内部前侧的集团电话部分。 内底板保持壳体的容纳PBX部分的部分的底部。 支撑柱设置在内底板的下表面上。 底座设置在支撑柱下面，保持整个外壳。 支撑柱在前侧具有弯曲表面，保护内底板和基座之间的电缆。

公开(公告)号：US06377671B2

公开(公告)日：2002-04-23

申请号：US09870486

申请日：2001-06-01

Applicant: Toshiaki Tanaka ,  Hiroshi Mano ,  Setsuo Kimura ,  Yoshihito Nagano ,  Masayuki Tsurusaki ,  Takashi Watanabe ,  Terunori Suwa ,  Isaku Komuro ,  Yoshihiro Kawauchi ,  Nobuhiro Masaki

Inventor： Toshiaki Tanaka ,  Hiroshi Mano ,  Setsuo Kimura ,  Yoshihito Nagano ,  Masayuki Tsurusaki ,  Takashi Watanabe ,  Terunori Suwa ,  Isaku Komuro ,  Yoshihiro Kawauchi ,  Nobuhiro Masaki

IPC: H04M100

CPC classification number: H04Q3/625 ,  H04M1/57 ,  H04M3/22 ,  H04M3/26 ,  H04M3/42 ,  H04M3/42059 ,  H04M3/42127 ,  H04M3/42195 ,  H04M3/42314 ,  H04M3/42323 ,  H04M3/428 ,  H04M3/4283 ,  H04M3/533 ,  H04M3/58 ,  H04M9/00 ,  H04M9/002 ,  H04M2201/38 ,  H04M2207/08 ,  H04M2242/22 ,  H04Q1/028 ,  H04Q1/10 ,  H04Q3/545 ,  H04Q3/58 ,  H04Q11/0407 ,  H04Q2201/10 ,  H04Q2201/806 ,  H04Q2213/13003 ,  H04Q2213/13034 ,  H04Q2213/13036 ,  H04Q2213/13076 ,  H04Q2213/1308 ,  H04Q2213/13091 ,  H04Q2213/13093 ,  H04Q2213/13096 ,  H04Q2213/13097 ,  H04Q2213/13102 ,  H04Q2213/13103 ,  H04Q2213/13106 ,  H04Q2213/1315 ,  H04Q2213/13152 ,  H04Q2213/1316 ,  H04Q2213/13162 ,  H04Q2213/13173 ,  H04Q2213/13174 ,  H04Q2213/13175 ,  H04Q2213/1318 ,  H04Q2213/13196 ,  H04Q2213/13199 ,  H04Q2213/13201 ,  H04Q2213/13203 ,  H04Q2213/13204 ,  H04Q2213/13209 ,  H04Q2213/13213 ,  H04Q2213/13216 ,  H04Q2213/1322 ,  H04Q2213/13242 ,  H04Q2213/13251 ,  H04Q2213/1326 ,  H04Q2213/13282 ,  H04Q2213/13292 ,  H04Q2213/13299 ,  H04Q2213/13302 ,  H04Q2213/13305 ,  H04Q2213/1332 ,  H04Q2213/13322 ,  H04Q2213/13334 ,  H04Q2213/1334 ,  H04Q2213/13362 ,  H04Q2213/13377 ,  H04Q2213/13392 ,  H04Q2213/13405

Abstract: According to this invention, a digital key telephone system connected to an analog public network NW having a function of transmitting a ringing signal including identification information of a calling line through a subscriber line (CO line), accommodating a plurality of extension lines each connected to a digital key telephone (DKT) 2 or a standard telephone (STT) 4 as an extension terminal, and having a function of switching and connecting the subscriber line to the plurality of extension lines or the extension lines to each other includes a called party storage means storing, in advance, information representing the correlation between the calling line and the extension terminals 2 and 4 as a called terminal. When a ringing signal arrives from the analog communication network NW, calling line identification information (caller ID) contained in the ringing signal is detected by a calling line identification information interface unit (RCIU) 12. A control unit (RCTU) 16 determines the called extension terminal on the basis of the detected caller ID and the information stored in the storage means, so the extension terminal receives the call from the digital key telephone interface unit (RDKU) 13 or a standard telephone interface unit (RSTU) 15.

公开(公告)号：US20010028708A1

公开(公告)日：2001-10-11

申请号：US09870682

申请日：2001-06-01

Applicant: Kabushiki Kaisha Toshiba

Inventor： Toshiaki Tanaka ,  Hiroshi Mano ,  Setsuo Kimura ,  Yoshihito Nagano ,  Masayuki Tsurusaki ,  Takashi Watanabe ,  Terunori Suwa ,  Isaku Komuro ,  Yoshihiro Kawauchi ,  Nobuhiro Masaki

IPC: H04M001/00

CPC classification number: H04Q3/625 ,  H04M1/57 ,  H04M3/22 ,  H04M3/26 ,  H04M3/42 ,  H04M3/42059 ,  H04M3/42127 ,  H04M3/42195 ,  H04M3/42314 ,  H04M3/42323 ,  H04M3/428 ,  H04M3/4283 ,  H04M3/533 ,  H04M3/58 ,  H04M9/00 ,  H04M9/002 ,  H04M2201/38 ,  H04M2207/08 ,  H04M2242/22 ,  H04Q1/028 ,  H04Q1/10 ,  H04Q3/545 ,  H04Q3/58 ,  H04Q11/0407 ,  H04Q2201/10 ,  H04Q2201/806 ,  H04Q2213/13003 ,  H04Q2213/13034 ,  H04Q2213/13036 ,  H04Q2213/13076 ,  H04Q2213/1308 ,  H04Q2213/13091 ,  H04Q2213/13093 ,  H04Q2213/13096 ,  H04Q2213/13097 ,  H04Q2213/13102 ,  H04Q2213/13103 ,  H04Q2213/13106 ,  H04Q2213/1315 ,  H04Q2213/13152 ,  H04Q2213/1316 ,  H04Q2213/13162 ,  H04Q2213/13173 ,  H04Q2213/13174 ,  H04Q2213/13175 ,  H04Q2213/1318 ,  H04Q2213/13196 ,  H04Q2213/13199 ,  H04Q2213/13201 ,  H04Q2213/13203 ,  H04Q2213/13204 ,  H04Q2213/13209 ,  H04Q2213/13213 ,  H04Q2213/13216 ,  H04Q2213/1322 ,  H04Q2213/13242 ,  H04Q2213/13251 ,  H04Q2213/1326 ,  H04Q2213/13282 ,  H04Q2213/13292 ,  H04Q2213/13299 ,  H04Q2213/13302 ,  H04Q2213/13305 ,  H04Q2213/1332 ,  H04Q2213/13322 ,  H04Q2213/13334 ,  H04Q2213/1334 ,  H04Q2213/13362 ,  H04Q2213/13377 ,  H04Q2213/13392 ,  H04Q2213/13405

Abstract: According to this invention, a digital key telephone system connected to an analog public network NW having a function of transmitting a ringing signal including identification information of a calling line through a subscriber line (CO line), accommodating a plurality of extension lines each connected to a digital key telephone (DKT) 2 or a standard telephone (STT) 4 as an extension terminal, and having a function of switching and connecting the subscriber line to the plurality of extension lines or the extension lines to each other includes a called party storage means storing, in advance, information representing the correlation between the calling line and the extension terminals 2 and 4 as a called terminal. When a ringing signal arrives from the analog communication network NW, calling line identification information (caller ID) contained in the ringing signal is detected by a calling line identification information interface unit (RCIU) 12. A control unit (RCTU) 16 determines the called extension terminal on the basis of the detected caller ID and the information stored in the storage means, so the extension terminal receives the call from the digital key telephone interface unit (RDKU) 13 or a standard telephone interface unit (RSTU) 15.