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31. 发明授权

US08014385B2 Integrated switch and switching method for simultaneously processing voice and IP data in the same channel 失效
标题翻译：用于在同一通道中同时处理语音和IP数据的集成开关和切换方法
公开(公告)号：US08014385B2
公开(公告)日：2011-09-06
申请号：US12155132
申请日：2008-05-29
申请人： Sung Soo Kang , Choon Sik Yim
发明人： Sung Soo Kang , Choon Sik Yim
IPC分类号： H04L12/66
CPC分类号： H04Q3/545 , H04Q2213/13003 , H04Q2213/1302 , H04Q2213/13034 , H04Q2213/1304 , H04Q2213/13196 , H04Q2213/13201 , H04Q2213/13296 , H04Q2213/1332 , H04Q2213/13389
摘要： Provided are an integrated switch and a switching method for simultaneously processing IP data and voice signals using silent periods during communication. The integrated switch provides a function of transmitting data packets using the silent periods during the communication of an existing switch subscriber, so that an existing frequency band and apparatus can be used without use of a separate frequency band and a separate apparatus for data transmission such as an existing asymmetric digital subscriber line (ADSL). In addition, efficiency of an existing switch can be increased without use of an apparatus for collecting and processing data provided in front of subscriber line cards.
摘要翻译：提供了一种用于在通信期间使用静默时段同时处理IP数据和语音信号的集成开关和切换方法。集成开关提供在现有交换机用户的通信期间使用静默时段发送数据分组的功能，使得可以使用现有的频带和装置，而不使用单独的频带和用于数据传输的单独装置，例如现有的非对称数字用户线（ADSL）。此外，可以增加现有交换机的效率，而不需要用于收集和处理在用户线路卡之前提供的数据的装置。

32. 发明授权

US07020265B2 Method for transmitting information to remote site using dynamic transmission network 失效
公开(公告)号：US07020265B2
公开(公告)日：2006-03-28
申请号：US10163975
申请日：2002-06-06
申请人： Chung-Nan Tien
发明人： Chung-Nan Tien
IPC分类号： G06F15/16 , H04L12/66 , H04M7/00 , H04M11/00
CPC分类号： H04Q3/0045 , H04Q2213/13174 , H04Q2213/13196 , H04Q2213/13201 , H04Q2213/13298 , H04Q2213/13389 , Y10S379/90 , Y10S379/901
摘要： The invention relates to a method for transmitting information such as fax, voice or data to a destination information device via a dynamic transmission network. The dynamic transmission network includes one or more transmission control servers (TCSs) and one or more transmission client nodes (TCNs). The TCS is always connected to the computer network, while the TCN is dynamically connected with the computer network. When connected to the computer network, the TCN checks its system status and then registers to the TCS. After getting the information from the TCN, the TCS stores said information into a dynamic transmission route table, wherein the information includes the country code, area code, Client ID, IP address, etc. of the TCN. Once any user requests the TCS to send a information to a destination site, the TCS will locate an available TCN physically nearest to the same country code and area code as those of the destination site, and then transmits the information to the TCN through the computer network. The TCN then sets up a dial-up connection with the destination information device through the public switched telephone network (PSTN) to send the information to the destination site.

33. 发明授权

US07012901B2 Devices, software and methods for generating aggregate comfort noise in teleconferencing over VoIP networks 有权
公开(公告)号：US07012901B2
公开(公告)日：2006-03-14
申请号：US09796400
申请日：2001-02-28
申请人： Ramanathan Jagadeesan , Luke K. Surazski
发明人： Ramanathan Jagadeesan , Luke K. Surazski
IPC分类号： H04L12/16
CPC分类号： H04L65/4038 , G10L19/012 , H04L29/06027 , H04M3/567 , H04Q11/0407 , H04Q2213/13034 , H04Q2213/1305 , H04Q2213/13201 , H04Q2213/1324 , H04Q2213/13389
摘要： Devices, software and methods are provided for generating aggregate comfort noise for teleconferencing over IP networks. A transcoding component includes a decoder for decoding streams of packets. A summing component has a summer with summing inputs to receive the decoded streams of packets. The summing component has at least one silence flag input, and an additional signaling path is used by the transcoding component to signal to the silence flag input if any of the decoded streams of packets includes a silence identification packet. In another embodiment, the summing component may or may not include the silence flag input, but the device includes an aggregate comfort noise generation component. The aggregate comfort noise may be programmed to be a balanced representation of all background noises.

34. 发明申请

US20050101266A1 Method for dynamic channel allocation 审中-公开
标题翻译：动态频道分配方法
公开(公告)号：US20050101266A1
公开(公告)日：2005-05-12
申请号：US10477290
申请日：2002-04-22
申请人： Dietmar Jurschik , Gunther Schauer , Armin Tannhauser
发明人： Dietmar Jurschik , Gunther Schauer , Armin Tannhauser
IPC分类号： H04L12/70 , H04Q11/04 , H04B1/034
CPC分类号： H04Q11/0457 , H04L2012/5615 , H04L2012/5663 , H04Q2213/13039 , H04Q2213/13097 , H04Q2213/13109 , H04Q2213/13162 , H04Q2213/13174 , H04Q2213/13176 , H04Q2213/13201 , H04Q2213/13202 , H04Q2213/13203 , H04Q2213/13204 , H04Q2213/13209 , H04Q2213/13215 , H04Q2213/13216 , H04Q2213/1329 , H04Q2213/13292 , H04Q2213/13332 , H04Q2213/13348 , H04Q2213/13361 , H04Q2213/13389
摘要： A method designated as Dynamic Rate Repartitioning (DRR) is provided, which allows temporary allocation of temporarily not-in-use time-multiplex based transmission channels of telephone or ISDN-links like channeled voice over DSL/CVoDSL to a simultaneously active ATM-link, in an SDSL/SHDSL- or ADSL frame of a corresponding DSL-link. The method increases the data rate and makes a more intensive use of the transmission capacity of the DSL-link. Switching is carried out with frame synchronization and without data loss, wherein bit positions can be maintained.
摘要翻译：提供了一种指定为动态速率重分配（DRR）的方法，其允许临时分配电话或ISDN链路的暂时不使用时间多路复用的传输信道，如通过DSL / CVoDSL的信道语音到同时活动的ATM链路，在相应DSL链路的SDSL / SHDSL或ADSL帧中。该方法提高了数据速率，并且更加密集地使用了DSL链路的传输容量。通过帧同步进行切换并且没有数据丢失，其中可以保持比特位置。

35. 发明申请

US20030229680A1 Method for transmitting information to remote site using dynamic transmission network 失效
标题翻译：使用动态传输网络向远程站点发送信息的方法
公开(公告)号：US20030229680A1
公开(公告)日：2003-12-11
申请号：US10163975
申请日：2002-06-06
发明人： Chung-Nan Tien
IPC分类号： G06F015/16
CPC分类号： H04Q3/0045 , H04Q2213/13174 , H04Q2213/13196 , H04Q2213/13201 , H04Q2213/13298 , H04Q2213/13389 , Y10S379/90 , Y10S379/901
摘要： The invention relates to a method for transmitting information such as fax, voice or data to a destination information device via a dynamic transmission network. The dynamic transmission network includes one or more transmission control servers (TCSs) and one or more transmission client nodes (TCNs). The TCS is always connected to the computer network, while the TCN is dynamically connected with the computer network. When connected to the computer network, the TCN checks its system status and then registers to the TCS. After getting the information from the TCN, the TCS stores said information into a dynamic transmission route table, wherein the information includes the country code, area code, Client ID, IP address, etc. of the TCN. Once any user requests the TCS to send a information to a destination site, the TCS will locate an available TCN physically nearest to the same country code and area code as those of the destination site, and then transmits the information to the TCN through the computer network. The TCN then sets up a dial-up connection with the destination information device through the public switched telephone network (PSTN) to send the information to the destination site.
摘要翻译：本发明涉及一种通过动态传输网络向目的地信息设备发送传真，语音或数据等信息的方法。动态传输网络包括一个或多个传输控制服务器（TCS）和一个或多个传输客户端节点（TCN）。 TCS始终连接到计算机网络，而TCN与计算机网络动态连接。当连接到计算机网络时，TCN检查其系统状态，然后注册到TCS。在从TCN获取信息之后，TCS将所述信息存储到动态传输路由表中，其中信息包括TCN的国家代码，区号，客户端ID，IP地址等。一旦任何用户请求TCS向目的地站点发送信息，TCS将定位最接近与目的地站点相同的国家代码和区号的可用TCN，然后通过计算机将信息发送到TCN 网络。 TCN然后通过公共交换电话网（PSTN）与目的地信息设备建立拨号连接，将信息发送到目的地。

36. 发明授权

US06542499B1 PSTN fallback using dial on demand routing scheme 有权
标题翻译： PSTN回退使用拨号按需路由方案
公开(公告)号：US06542499B1
公开(公告)日：2003-04-01
申请号：US09901779
申请日：2001-07-09
申请人： James Murphy , Ilya Umansky
发明人： James Murphy , Ilya Umansky
IPC分类号： H04L1266
CPC分类号： H04M7/0057 , H04L12/5692 , H04L12/6418 , H04L29/06 , H04L45/00 , H04L45/22 , H04L47/11 , H04L47/122 , H04L47/15 , H04L47/2416 , H04L47/70 , H04L47/724 , H04L47/745 , H04L47/762 , H04L47/801 , H04L47/805 , H04L47/822 , H04L47/826 , H04L47/829 , H04L69/14 , H04L2012/6472 , H04L2012/6481 , H04Q3/0045 , H04Q2213/13034 , H04Q2213/13093 , H04Q2213/13167 , H04Q2213/13201 , H04Q2213/13296 , H04Q2213/13389
摘要： A call fallback scheme is provided in a packet switched network. After receiving incoming calls, a Voice over IP (VoIP) link is established over a packet switched network with a destination endpoint. VoIP packets are generated from the incoming calls and sent over the VoIP link to the destination endpoint. When a low quality of service condition is detected on the VoIP link with the destination endpoint, a fallback call is established with the destination endpoint over a circuit switched network. The VoIP packets for the incoming calls are redirected from the VoIP link to the circuit switched data link. As opposed to simply hairpinning a TDM voice call back over the PSTN network 102, the same VoIP packets for the incoming calls originally destine for the destination endpoint over the packet switched network are rerouted through the fallback call. This simplifies synchronization with VoIP packets sent over the VoIP network. Because VoIP packets for more than one call can be sent over the fallback call, the cost of maintaining the fallback call is also substantially reduced.
摘要翻译：在分组交换网络中提供呼叫回退方案。在接收到来电之后，通过具有目的地端点的分组交换网络建立IP语音（VoIP）链路。 VoIP来自呼入电话并通过VoIP链路发送到目的端点。当在与目的地端点的VoIP链路上检测到低质量的服务条件时，通过电路交换网络与目的地端点建立回退呼叫。用于来电的VoIP分组从VoIP链路被重定向到电路交换数据链路。与通过PSTN网络102简单地发送TDM语音呼叫相反，用于通过分组交换网络最初针对目的地端点的呼入呼叫的相同VoIP分组通过回退呼叫被重新路由。这简化了通过VoIP网络发送的VoIP数据包的同步。因为用于多个呼叫的VoIP分组可以通过回退呼叫发送，所以维护回退呼叫的成本也大大降低。

37. 发明授权

US06526067B1 Method of transmitting data on an ISDN subscriber line, as well as line termination, exchange, network termination, and data terminal therefor 失效
标题翻译：在ISDN用户线上发送数据的方法以及线路终端，交换机，网络终端和数据终端
公开(公告)号：US06526067B1
公开(公告)日：2003-02-25
申请号：US09115710
申请日：1998-07-15
申请人： Waldemar Weiss
发明人： Waldemar Weiss
IPC分类号： H04J316
CPC分类号： H04Q11/0428 , H04Q2213/13096 , H04Q2213/13174 , H04Q2213/13176 , H04Q2213/13201 , H04Q2213/13202 , H04Q2213/13208 , H04Q2213/13209 , H04Q2213/1327 , H04Q2213/13271 , H04Q2213/13332
摘要： The invention relates to a method of transmitting data on an ISDN subscriber line having a data channel (D16) and two or more voice- or data-carrying channels (B64), using the data channel. The method is characterized in that on receipt of each connection request, a check is made to determine whether the desired connection can or is to be established as a data connection, that said connection is established via the data channel (D16), that a further check is made to determine whether a voice- or data-carrying channel (B64) is still free, that the capacity of said channel is added to the connection via the data channel (D16), that provision is made for continuously monitoring whether a voice- or data-carrying channel (B64) occupied by the data connection is requested for another connection or whether such a channel hitherto needed for another connection is no longer needed therefor, that a voice- or data-carrying channel (B64) requested by another connection and occupied by the data connection is made available for the requested connection, that the capacity of a channel no longer needed by another connection is added to the data connection, and that for the transmission of data over the data connection, the respective total available capacity is used. The invention further relates to a line termination for an exchange, an exchange with a line termination, a network termination for a data terminal, and a data terminal with a line termination.
摘要翻译：本发明涉及使用数据信道在具有数据信道（D16）和两个或多个语音或数据携带信道（B64）的ISDN用户线上发送数据的方法。该方法的特征在于，在接收到每个连接请求时，进行检查以确定所需连接是否可以被建立为数据连接，所述连接经由数据信道（D16）建立，另外检查语音或数据承载信道（B64）是否仍然空闲，所述信道的容量经由数据信道（D16）被添加到连接，该条款用于连续监视语音或数据连接所占用的数据承载信道（B64）被请求用于另一连接，或者不再需要这样的另一连接所需的信道，另一个请求的语音或数据承载信道（B64）数据连接占用的连接对于所请求的连接可用，另一连接不再需要的信道的容量被添加到数据连接，而对于传输o f数据通过数据连接，使用相应的总可用容量。本发明还涉及用于交换的线路终端，与线路终端的交换，数据终端的网络终端以及具有线路终端的数据终端。

38. 发明授权

US06456705B1 Digital key telephone system and extension terminal device thereof 有权
标题翻译：数字电话系统及其分机终端装置
公开(公告)号：US06456705B1
公开(公告)日：2002-09-24
申请号：US09870453
申请日：2001-06-01
申请人： Toshiaki Tanaka , Hiroshi Mano , Setsuo Kimura , Yoshihito Nagano , Masayuki Tsurusaki , Takashi Watanabe , Terunori Suwa , Isaku Komuro , Yoshihiro Kawauchi , Nobuhiro Masaki
发明人： Toshiaki Tanaka , Hiroshi Mano , Setsuo Kimura , Yoshihito Nagano , Masayuki Tsurusaki , Takashi Watanabe , Terunori Suwa , Isaku Komuro , Yoshihiro Kawauchi , Nobuhiro Masaki
IPC分类号： H04M100
CPC分类号： H04M3/42314 , H04M1/57 , H04M3/22 , H04M3/26 , H04M3/42 , H04M3/42059 , H04M3/42127 , H04M3/42195 , 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 , H04Q3/625 , 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
摘要： 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.
摘要翻译：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密钥电话（DKT）2或标准电话（STT）4，具有将用户线切换并连接到多个分机线或分机线的功能，包括被叫方存储意味着预先存储表示主叫线路与分机终端2和4之间的相关性的信息作为被叫终端。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）。控制单元（RCTU）16确定被叫扩展终端基于检测到的呼叫者ID和存储在存储装置中的信息，所以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。

39. 发明申请

US20010024494A1 Digital key telephone system and extension terminal device thereof 有权
公开(公告)号：US20010024494A1
公开(公告)日：2001-09-27
申请号：US09870487
申请日：2001-06-01
申请人： Kabushiki Kaisha Toshiba
发明人： Toshiaki Tanaka , Hiroshi Mano , Setsuo Kimura , Yoshihito Nagano , Masayuki Tsurusaki , Takashi Watanabe , Terunori Suwa , Isaku Komuro , Yoshihiro Kawauchi , Nobuhiro Masaki
IPC分类号： H04M001/00
CPC分类号： 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
摘要： 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.

40. 发明申请

US20010024492A1 Digital key telephone system and extension terminal device thereof 有权
标题翻译：数字电话系统及其分机终端装置
公开(公告)号：US20010024492A1
公开(公告)日：2001-09-27
申请号：US09870452
申请日：2001-06-01
发明人： Toshiaki Tanaka , Hiroshi Mano , Setsuo Kimura , Yoshihito Nagano , Masayuki Tsurusaki , Takashi Watanabe , Terunori Suwa , Isaku Komuro , Yoshihiro Kawauchi , Nobuhiro Masaki
IPC分类号： H04M001/00 , H04M003/00
CPC分类号： 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
摘要： 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.
摘要翻译：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密钥电话（DKT）2或标准电话（STT）4，具有将用户线切换并连接到多个分机线或分机线的功能，包括被叫方存储意味着预先存储表示主叫线路与分机终端2和4之间的相关性的信息作为被叫终端。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）。控制单元（RCTU）16确定被叫扩展终端基于检测到的呼叫者ID和存储在存储装置中的信息，所以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。

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