JP2010220138A - Method for responding to incoming telephone call and telephone exchange system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent charging by a telephone call from a telephone set in a destination visited. <P>SOLUTION: In a telephone system, a caller number may be recorded in response to a one-ringing call from a caller and the recorded caller number may be called back and connected, so that the telephone exchange system may be charged. Therefore, a telephone exchange system 10 includes a connection destination database 20 for previously registering a caller number of a telephone set that a user uses in a destination visited. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for connecting a telephone line using a caller number received at the time of incoming call, and a telephone switching system therefor.

  As a prior art, a method of connecting to a predetermined extension number using a caller number received at the time of incoming call and a telephone exchange system thereof are known (for example, see Patent Document 1).

  This telephone exchange system has a memory that stores in advance a transfer destination extension number corresponding to a caller number as an in-house telephone exchange device, and an extension stored in the memory when a call is received from the caller number Number or forwarding number is called and connected.

  In addition, with recent multifunctionalization and wide communication areas, telephone switching systems include CTI systems in which a computer telephony integration (CTI) device is added to a corporate telephone switching device (PBX) (for example, , See Patent Document 2).

  In the conventional technology described above, a telephone switching system such as a general in-house telephone switching apparatus or a CTI system automatically connects and calls a recorded extension number or forwarding number when receiving a call. Therefore, at that time, the telephone exchange system transmits a ring tone (RBT) to the caller and a call signal (RING) to the callee, and a call path with the caller is formed by a response from the callee. ing. The same connection operation is performed even in the CTI system.

  On the other hand, there is a method of one-off in the telephone exchange system. One-off means that the telephone is called and disconnected before the called party answers, and his / her telephone number can be left in the other party's incoming call history. In recent years, there are many malicious calls due to one-off calls, so there are communication devices, communication terminals, etc. where appropriate measures such as call rejection are taken so that telephone terminals do not receive one-off calls, and many technologies are disclosed (For example, see Patent Document 3).

Japanese Patent Laid-Open No. 11-177695 JP 2001-298542 A JP 2005-045387 A

  However, the telephone exchange system according to the prior art has a problem that when a personal telephone is used when contacting a company or office to which the user belongs from the outside, the call charge is borne by the individual. The above Patent Document 1 is no exception, and the procedure for applying to the company for the personal burden is troublesome.

  On the other hand, there is an incoming billing telephone (commonly called toll-free) service that pays the call fee to the recipient using an incoming billing line from the outside line to the in-house telephone device for the customer service of the company and for the communication of the employee on the go. . This service does not require any change in the telephone exchange system and there is no charge for the caller from the outside line, but the charge for this service is added to the telephone exchange system on the receiving side. Therefore, it is desirable to solve the above-mentioned problem with a simple function change for avoiding the additional burden of call charges for incoming calls from outside employees in the telephone exchange system.

  In order to solve the above-described problem, in the present invention, a one-off operation is used for making a call from an outside place. In other words, the user registers in advance the telephone number to be transmitted from the outside in the memory of the telephone exchange system of the affiliated company, and makes a one-off transmission from the outside. The telephone exchange system knows the caller number by one-off, and can retrieve the caller from the memory. The memory is referred to as a connection destination database. The caller side is not charged for one-off, and the caller ID is recorded in the incoming call history in the telephone exchange system.

  In the method for answering an incoming call of the telephone exchange system according to the present invention, the telephone exchange system has a connection destination database in which a caller number of a telephone used by a user on the go is registered in advance. When the same caller number is detected from the connection destination database when the number is received, the detected caller number is called as a priority connection destination, and the response of the priority connection destination is set in advance when accepted. The predetermined connection destination is called and connected to the priority connection destination.

  The telephone exchange system according to the present invention is the same as the connection destination database in which the caller number of the telephone used by the user in advance is registered in advance and the connection destination database when the caller number is received by one-way incoming call. A connection destination extraction unit that extracts a caller ID, and calls the extracted caller number as a priority connection destination, calls a predetermined connection destination that is set in advance when receiving a response of the priority connection destination, and performs the priority And a line connection control unit connected to the connection destination.

  With such a configuration, a user telephone from an external line connected to the telephone exchange system is connected by an outgoing call from the telephone exchange system, so this call charge is imposed on the telephone exchange system owner. For example, an exchange or a specific message sending device can be set as the predetermined connection destination.

  Furthermore, in order to avoid unnecessary use by users from outside, the connection destination database further registers connection destination telephone numbers corresponding to the respective caller numbers from the outside, and from the outside to the caller ID When the call is received, it is preferable to call the caller number and call the connected telephone number corresponding to the caller number to enable mutual communication. For example, the extension number of a direct manager can be recorded for a report from outside the office. Further, this connection destination telephone number need not be limited to an extension.

  Furthermore, in order to avoid unnecessary use by the user, it is desirable to register an expiration date corresponding to each caller number from the outside in the connection destination database.

  Further, it is desirable that the telephone exchange system is a CTI system in order to realize a multi-function capable of computer control.

  In the present invention, when a user telephone connected to an outside line calls one call with a subscriber number of the telephone exchange system, the call is called by a callback from the telephone exchange system. Call charges are charged to the telephone switching system owner. Therefore, there is an effect that the user telephone owner from the outside line is not charged but charged to the telephone switching system owner company, for example. Furthermore, when the CTI system is configured, detailed call records can be obtained, which is effective for communication management of employees.

It is explanatory drawing which shows the block structure which concerns on Example 1 of this invention. It is explanatory drawing which shows one Embodiment of the sequence chart by this invention in FIG. (Example 1) It is explanatory drawing which shows one Embodiment of the flowchart of the telephone switching system by this invention in FIG. (Example 1) It is explanatory drawing which shows the block structure which concerns on Example 2 of this invention. It is explanatory drawing which shows one Embodiment of the sequence chart by this invention in FIG. (Example 2) It is explanatory drawing which shows the block structure which concerns on Example 3 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  An object of the present invention is to charge a telephone exchange system owner for a specific individual user, not a telephone set for outgoing calls. That is, the present invention pre-registers a subscriber number of a phone that a user sends from a destination as a caller number in the connection destination database of the telephone exchange system, and the user makes a one-off call from the destination. The switching system calls back to the caller number that was notified when the one-off call was received.

  The following embodiment will be described with reference to a functional block diagram, a sequence chart, and a flowchart. However, changes such as distribution / merging of block functions or replacement of procedures are free as long as they satisfy the gist of the present invention, the functions described in the specification and described in the claims, and the present invention is limited by the following description. Is not to be done.

  A telephone exchange system according to the first embodiment will be described with reference to FIGS.

  The illustrated private branch exchange system 10 includes a private branch exchange (PBX) 1 and an automatic connection device 2. The private branch exchange 1 can connect telephones 21 and 22 via an external line and includes a telephone 31. Multiple extensions are connected. The private branch exchange 1 is a general PBX, and includes an incoming call detection unit 11, a connection destination reception unit 12, and a line connection control unit 13. The automatic connection device 2 is a device that is a feature of the present invention, and includes a one-off caller number detection unit 14, a connection destination extraction unit 15, and a connection destination database 20.

  The connection destination database 20 has an area for recording a caller number, a connection number corresponding to each caller number, and an expiration date. The caller number is the caller number of the telephone 21 that uses the outside line from the outside in order for the user to use the function according to the present invention, and the subscriber number that the telephone 21 registers with the telecommunications carrier, for example, “03- 4567-8901 "is recorded in advance according to a predetermined procedure. Multiple caller numbers can be registered by a single user. The connection destination number is a connection destination for connecting a telephone from an outside place, and here, it is assumed that it is the extension number “2001” of the telephone 31 at the seat of the private telephone exchange device 1. When the connection destination number is not registered, the connection destination can be set in advance with a switchboard or the like as a specific connection destination, and connection control can be performed. Further, it is assumed that the expiration date “2011/12/31” is recorded in advance in the area corresponding to the caller ID “03-4567-8901”. It is desirable that the expiration date be automatically limited to a short period such as within one week. Therefore, when the expiration date is exceeded, the sender number, connection destination number, and expiration date in that area are deleted.

  The incoming call detection unit 11 transfers the data to the connection destination reception unit 12 for normal call processing when an incoming call is received by the private branch exchange 1, and the one-way caller of the automatic connection device 2 Data is transferred to the number detection unit 14. In the case of a one-way incoming call, the processing of the connection destination receiving unit 12 ends and the apparatus is restored. However, the one-off caller number detecting unit 14 detects “one-off” and temporarily stores the received caller number. In order to reliably detect a one-way incoming call, it is desirable that the incoming call detection unit 11 does not transmit an automatic response signal within a predetermined time, for example, a time until two call signals are received. Even in the setting to connect to the switchboard, it is necessary to proceed with the calling process after a predetermined time has elapsed.

  In the normal processing, the connection destination receiving unit 12 receives the caller side outside line port and the connection destination number “2001” from the incoming call detection unit 11 and sends them to the line connection control unit 13 together with the line connection request. In this case, the line connection control unit 13 selects and calls one of the free extension ports obtained from the connection destination number, and responds to the call path between this extension port and the caller side external line port. Connecting. The connection destination reception unit 12 receives the caller number and the connection destination number from the connection destination extraction unit 15 as a set of a priority connection destination and a predetermined connection destination, and sends them to the line connection control unit 13 together with a line connection request. .

  In this case, the line connection control unit 13 first calls through the outside line using the caller number “03-4567-8901” of the priority connection destination. When the telephone 21 on the outside line answers the call, the line connection control unit 13 calls the extension number “2001” of the predetermined connection destination. When the extension telephone 31 responds to this call, the line connection control unit 13 sets a communication path between the telephone 21 with the caller number “03-4567-8901” and the telephone 31 with the connection destination number “2001”. And establish. The reason why the caller ID “03-4567-8901” is the priority connection destination is that the caller from the other party is not received while waiting for the call back, and the called party of the predetermined connection destination is connected first. This is to avoid a situation in which the caller side waits for a response.

  The one-off caller number detection unit 14 receives an incoming call from the telephone 21 having the caller number “03-4567-8901” via the incoming call detection unit 11 and detects one-off, and stores the stored caller number “03 -4567-8901 "is transferred to the connection destination extraction unit 15. The connection destination extraction unit 15 searches the connection destination database 20 for the received caller number, and when the same caller number is detected, extracts the connection number “2001” in that area. The caller number and the connection destination number are transferred to the connection destination reception unit 12 of the private branch exchange apparatus 1 as a set. In this case, since the caller number precedes the call, it becomes a priority connection destination, and the connection destination number becomes a predetermined connection destination. One cut is determined when caller disconnection is detected within a predetermined time from detection of incoming call.

  The connection destination number in the connection destination database 20 may be the telephone number of the telephone 22 that calls through the external line if the private branch exchange 1 has a function of connecting the incoming call to another external line. In this case, when a one-way incoming call is accepted from the telephone set 21, a telephone line with the telephone set 22 is established, and both the telephone sets 21 and 22 are charged. In order to save money, it is desirable to limit the extension of the connection number.

  The telephones 21 and 22 on the outside line may be fixed telephones or mobile telephones. The same applies to the extension telephone 31.

  In FIG. 1, the private branch exchange 1 and the automatic connection device 2 are shown separately in order to clarify the distinction from a general telephone exchange, but it may be a single device, and the function sharing is as described above. It may be different. For example, the one-off caller number detection unit 14 is included in the automatic connection apparatus 2 but may be provided in the private branch exchange apparatus 1.

  FIG. 2 shows a processing flow centered on the private branch exchange system 10. A form of call processing of the private branch exchange system 10 will be described with reference to FIG.

  In the private branch exchange system 10, the caller number “03-4567-8901” and the corresponding connection number “2001” are registered in advance in the connection destination database 20 by the user.

  The user dials a telephone exchange network (not shown) with a subscriber number previously assigned to the private telephone exchange system 10 by a telecommunications carrier in order to call the private telephone exchange system 10. In the telephone exchange network, a call is made by the subscriber number (procedure S1), the private telephone exchange system 10 is called, and the private telephone exchange apparatus 1 receives the call. In the private branch exchange system 10, the incoming call detection unit 11 of the private branch exchange 1 detects the incoming call and connects the outside line to the one-way caller number detection unit 14. The number is received (step S2) and temporarily stored.

  Next, when the caller telephone 21 performs the one-off process (procedure S3), the one-cut caller number detection unit 14 detects it (step S4) and notifies the connection destination extraction unit 15 of the caller number. The connection destination extraction unit 15 searches the connection destination database 20 with the received caller number, extracts the connection number “2001” corresponding to the same caller number (step S5), and sends the caller to the connection destination reception unit 12. Send with number. The caller number and the connection destination number are transmitted to the line connection control unit 13 via the connection destination receiving unit 12. The line connection control unit 13 first calls the telephone 21 via the outside line with the caller number (step S6).

  Since the caller telephone 21 that has been cut off is waiting for a call back, it immediately responds to the call from the private branch exchange system 10 (step S7). From this point on, billing is started on the external telephone exchange network.

  The line connection control unit 13 that has received the response of the caller telephone 21 calls the extension telephone 31 of the connection destination number (step S8), so that the extension telephone 31 that has received the call responds (procedure S9). The line connection control unit 13 that has detected the response of the extension telephone 31 interconnects the corresponding external line and extension line to form a telephone line. As a result, a call path is established (procedure S10), so that both calls can be made.

  Next, an example of the operation procedure in the private branch exchange system 10 will be described with reference to FIG.

  In the private branch exchange system 10, when an incoming call is received from the telephone 21 having the caller number “03-4567-8901” from the outside line (A), the incoming call detection unit 11 receives the call and receives the caller ID. Then, the temporary recording (step S11) is performed, and the outside line is connected to the one-cut caller number detection unit 14, and the next predetermined operation instruction is awaited. Incoming call detection unit 11 has no connection destination instruction (NO in step S12) by the next operation such as automatic connection to the switchboard or dial-in, and no disconnection signal is accepted from the calling side (NO in step S13). Return the procedure to step S12.

  When the above step S12 is “YES” and the connection destination is instructed by the next operation, the incoming call detection unit 11 notifies the connection destination reception unit 12 of the instruction, and the line connection control unit 13 is connected to the line by normal incoming call. (Procedure S14), and the connection to the one-off caller number detection unit 14 is disconnected. When step S13 is “YES” and there is no connection destination instruction and a disconnection signal is received from the calling side, the one-off caller number detection unit 14 detects this as “one-off” and the connection destination extraction unit 15 Notify the caller ID.

  The connection destination extraction unit 15 searches the connection destination database 20 with the received caller number (step S21). If the caller number “03-4567-8901” is registered in the connection destination database 20 (YES in step S22), and if the corresponding connection number “2001” is registered (YES in step S23), the connection destination The extraction unit 15 extracts the connection destination number “2001” and notifies the connection destination reception unit 12 together with the caller number “03-4567-8901”. The connection destination receiving unit 12 sets the received caller number “03-4567-8901” and the connection destination number “2001” as the priority connection destination and the predetermined connection destination, and notifies the line connection control unit 13 of them.

  The line connection control unit 13 controls the private branch exchange 1 to call the priority connection destination caller number “03-4567-8901” and accept the response signal (step S24). Next, the line connection control unit 13 calls the connection destination number “2001” of the predetermined connection destination (step S25), and waits for and accepts the response signal (YES in step S26). As a result, a line between the outside line on the caller side and the extension line at the connection destination is connected to form a communication path (step S27), so that the telephone 21 and the telephone 31 can talk.

  When the above step S22 is “NO” and the caller ID is not registered, a predetermined operation (procedure S28) for restoring the operation of the component related to this function in the private branch exchange system 10 is executed. The predetermined operation of connecting the caller number to a predetermined connection destination in the private branch exchange system 10 when the caller number is registered and the connection number of “NO” in step S23 is not registered Perform a different action than

  At any point in the above procedure, the private branch exchange system 10 is restored to the initial state upon reception of a disconnection signal from the caller. Further, when the private branch exchange 1 has a function of connecting lines between external lines, for example, the external line number of the telephone 22 can be registered as the connection destination number.

  With such a configuration, even when a user calls his company from the outside, a call charge can be imposed on his company, and a personal charge burden can be avoided.

  An embodiment in which the telephone exchange system according to the second embodiment is configured by a CTI (Computer Telephony Integration) system will be described with reference to FIGS.

  The illustrated CTI system 40 includes a private branch exchange (PBX) 3 and a CTI apparatus 4. The private branch exchange 3 can connect telephones 21 and 22 via external lines, and the telephone 31 and the CTI apparatus 4. Multiple extensions including are connected. The CTI device 4 has an external line to which a unique subscriber number is assigned corresponding to the external line correspondence of the CTI system 40, and is connected with an extension number assigned to one extension of the private branch exchange 3. Further, the CTI device 4 is provided with a PC (personal computer) terminal 51 shown in correspondence with each extension telephone 31.

  The private branch exchange 3 is a general PBX, and includes an incoming call detection unit 41, a connection destination reception unit 42, and a line connection control unit 43. The CTI device 4 further includes an outside line connection unit 46 and an extension line connection unit 47 in addition to the one-off caller number detection unit 44, the connection destination extraction unit 45, and the connection destination database 20.

  That is, the characteristic part of the present invention is included in the CTI device 4, and an external line connection unit 46 and an internal line connection unit 47 are added. The external line connection unit 46 has an interface function for receiving incoming calls from external lines, and the internal line connection unit 47 has an interface function with the private branch exchange 3. Therefore, in the present embodiment, the connection destination extraction unit 45 notifies the connection destination reception unit 42 of the connection destination information via the extension connection unit 47. 4, components having the same names as those in FIG. 1 have the same functions. Therefore, since the private branch exchange apparatus 3 has the CTI apparatus 4 as an extension, the private telephone exchange apparatus 3 is mutually connected by the incoming call from the CTI apparatus 4 and the outgoing call to the CTI apparatus 4 to exchange various data information. The PC terminal 51 has a known role in the CTI system.

  In the present embodiment, each component having the same name as that of the above embodiment has been described in the above embodiment, and detailed description thereof will be omitted here.

  Next, with reference to FIG. 5 and FIG. 4, the operation procedure of the private branch exchange apparatus 3 and the CTI apparatus 4 will be described.

  In the CTI system 40, it is assumed that the caller number “03-4567-8901” and the corresponding connection number “2001” are registered in advance in the connection destination database 20 by the user.

  The user dials a telephone exchange network (not shown) using an external subscriber number connected to the CTI device 4 in the CTI system 40. In the telephone exchange network, the CTI device 4 is called by the subscriber number (step S31), and the CTI device 4 receives the call. In the CTI device 4, the outside line connection unit 46 detects the incoming call and connects the outside line to the one-off caller number detection unit 44, and the one-off caller number detection unit 44 receives the caller number (step S32). And store it temporarily.

  Next, since the caller telephone 21 performs one-off processing (step S33), the one-off caller number detection unit 44 detects it (step S34) and notifies the connection destination extraction unit 45 of the caller number. The connection destination extraction unit 45 searches the connection destination database 20 with the received caller number, extracts a connection number corresponding to the same caller number (step S35), and sends it to the extension connection unit 47 together with the caller number. . The extension connection unit 47 sets the caller number as the priority connection destination and the extracted connection destination number as the predetermined connection destination, and calls the private branch exchange 3 to make a connection request (step S36).

  The CTI device 4 can display the processing status on the screen (step S37) by accessing the corresponding PC terminal 51 when the connection destination number is identified as the extension of the private branch exchange 3 by a known technique. Further, the CTI device 4 can exchange information with the PC terminal 51 and execute various functions of the CTI device 4.

  The private branch exchange apparatus 3 that has accepted the call in step S36 first calls the caller telephone 21 with the caller number of the priority connection destination (step S41). When the caller answers the call (procedure S42), and the private branch exchange 3 accepts the response from the caller telephone 21 (procedure S43), the private branch exchange 3 calls the extension telephone 31 of the predetermined connection destination ( Step S44). When the private telephone exchange apparatus 3 accepts the response, the line between the extension telephone 31 and the caller telephone 21 that has responded first is connected to form a telephone line. As a result, a call path is established (step S45). The situation from step S41 to step S45 is notified to the CTI device 4 and displayed on the screen of the PC terminal 51.

  With such a configuration, in this embodiment, a call request from an outside line can be established with a charge on the company side. Furthermore, various well-known functions of the CTI system can be included with respect to the functions of the present invention.

  One mode of forming the telephone exchange system according to the third embodiment in a CTI (Computer Telephony Integration) system will be described with reference to FIG.

  The illustrated CTI system 60 includes a private telephone exchange device 5 and a CTI device 6. The private telephone exchange device 5 can connect telephones 21 and 22 via an external line, and includes a telephone 31 and a CTI device 6. Is connected to the extension. The CTI device 6 is connected to the extension in the private telephone exchange device 5 of the CTI system 60 and has an extension number. That is, all connections with the telephone in the CTI device 4 are performed via the private telephone exchange device 5. Therefore, this embodiment does not have the external line connecting portion provided in the above embodiment.

  The private branch exchange 5 is a general PBX, and includes an incoming call detection unit 61, a connection destination reception unit 62, and a line connection control unit 63. The CTI device 6 further includes an extension connection unit 66 in addition to the one-off caller number detection unit 64, the connection destination extraction unit 65, and the connection destination database 20. In the present embodiment, components having the same names as those shown in the above embodiments have almost the same functions.

  When the CTI device 6 receives an incoming call from an external line via an extension line, the CTI device 6 draws the call line of the private telephone exchange device 5 to the one-off caller number detection unit 64 via the extension connection unit 66. Since other operation procedures are based on the above procedure, detailed description thereof is omitted.

  The present invention records the caller ID before answering by the telephone switching system by one-off operation of the caller, so that the telephone switching system recalls the caller ID and is not charged to the telephone at the outside line. Since the telephone exchange system is charged, a user limited by predetermined registration can use the multi-functions of the telephone exchange system free of charge from the outside line. This is particularly noticeable when it has a CTI function.

  As mentioned above, although this invention was demonstrated in detail with reference to embodiment and an Example, this invention is not limited to the said embodiment and Example. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

1, 3, 5 Private telephone exchange device 2 Automatic connection device 4, 6 CTI device 10 Private telephone exchange system 11, 41, 61 Incoming call detection unit 12, 42, 62 Connection destination reception unit 13, 43, 63 Line connection control unit 14 , 44, 64 One-off caller number detection unit 15, 45, 65 Connection destination extraction unit 20 Database 21, 22, 31 Telephone 40, 60 CTI system 46 External connection unit 47, 66 Extension connection unit 51 PC terminal

Claims (10)

  The telephone exchange system has a connection destination database in which a caller ID of a telephone used by a user on the go is registered in advance, and the same caller ID is received from the connection destination database when the caller ID is received by one-way incoming call. Calling the detected caller number as a priority connection destination, calling a predetermined connection destination set in advance when receiving a response from the priority connection destination, and connecting to the priority connection destination. A method for answering incoming calls.   2. The answering method for an incoming call according to claim 1, wherein the predetermined connection destination is registered in advance in the connection destination database corresponding to each of the caller numbers, and the predetermined connection destination is taken out from the connection destination database. A method for answering an incoming call, characterized in that:   3. The method for responding to an incoming call according to claim 2, wherein the predetermined connection destination is a telephone number.   4. The method for responding to an incoming call according to claim 1, wherein an expiration date corresponding to the caller ID is further registered in the connection destination database. Method.   The telephone exchange system extracts the same caller ID from the connection destination database in which the caller ID of the telephone used by the user in advance is registered in advance and the caller ID when the caller ID is received by one-way incoming call. A connection destination extraction unit that calls the extracted caller number as a priority connection destination, calls a predetermined connection destination that is set in advance when receiving a response of the priority connection destination, and connects to the priority connection destination A telephone switching system comprising: a line connection control unit;   6. The telephone exchange system according to claim 5, wherein the predetermined connection destination is registered in advance in an area provided corresponding to each of the caller numbers in the connection destination database.   7. The telephone exchange system according to claim 6, wherein the predetermined connection destination is a telephone number.   8. The telephone exchange system according to claim 5, wherein the connection destination database has an area for registering an expiration date corresponding to each of the caller numbers.   9. The telephone exchange system according to claim 5, wherein a private telephone exchange apparatus that accommodates and interconnects extension lines and external lines, and a CTI (Computer and Telephony Integration) apparatus that is connected to the private telephone exchange apparatus as an extension line. And the CTI device includes a detection unit that detects a one-off call from a telephone having the caller number together with the caller number, the connection destination database, and the connection destination extraction unit. Exchange system.   10. The telephone exchange system according to claim 9, further comprising an external line connection unit for connecting the external line to which the CTI device is given a subscriber number and interfacing with the external line.

Images