JP2007228363A - Telephone in which multiple phone numbers can be registered, and ip telephone system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a telephone in which multiple phone numbers can be registered and which enables a user to set whether an incoming call history is recorded for each incoming call number depending on the utilization mode, and to provide an IP telephone system. <P>SOLUTION: The telephone enables registration of multiple phone numbers such as a personal phone number and a group incoming call phone number in the same device. The telephone 50 includes an incoming call history setting section 505 for setting whether the incoming call history should be left for each phone number registered in the telephone 50; a memory 507 for storing an absent incoming call history; and an incoming call history storage control section 506 for storing the incoming call history into the memory 507 when an incoming call arrives during absence. The control section 506 detects an incoming call phone number when the telephone 50 receives an incoming call during absence, and stores the incoming call history into the memory 507 by referring to the phone number registered in the setting section 505. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a telephone and an IP telephone system in which a plurality of telephone numbers such as a personal telephone number and a group incoming telephone number can be set on the same telephone. Accordingly, the present invention relates to a telephone and an IP telephone system that can set whether to record an incoming call history for each incoming telephone number.

  In recent years, IP telephone services using an IP network have been provided. In the IP telephone system, voice is digitized, further converted into IP packets, flows on the IP network, and reaches the destination. The IP packet received at the call destination is restored to the original information, and thus a call can be made between the sending side and the call destination. This IP telephone system is being widely used because it can reduce operation, maintenance, and management costs as compared with an existing telephone network.

  As such an IP telephone system, a VoIP (Voice over Internet Protocol) system is currently on the market. As a typical call control protocol of the VoIP system, there is a SIP (Session Initiation Protocol). The call control by the SIP server includes an outgoing control command called INVITE. The INVITE command is the first control message sent from the IP phone on the calling side to the destination. In this message, the destination address, caller address, communication capability information as well as the caller name and company name are called for each phone. Can be sent to the destination as supplementary information.

  In an IP network, it is necessary to uniquely recognize a partner by using an address assigned to a device such as an IP address. For this reason, a device called a gatekeeper is generally used. The gatekeeper manages a database in which a telephone number assigned to an IP telephone and an IP address are associated with each other, and searches for a corresponding IP address in accordance with the designation of the telephone number from the IP telephone, so Enable to specify the IP address of the telephone.

  For example, in the IP telephone system disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-147101), the MAC address and the IP address are received from the IP telephone before the operation of the IP telephone is started, and are included in the network address. Disclosed is a gatekeeper device having telephone number numbering means for registering and managing a telephone number, an IP address and a MAC address in association with the telephone number, a telephone number set in advance based on the address and notifying the IP telephone ing. By using an apparatus as disclosed in Patent Document 1, a unique address such as a telephone number and setting information can be automatically set for each user terminal when the power is turned on.

  In the IP phone system as described above, when a specific IP phone receives an incoming call, check the connection media such as voice codec and packet length between the other party (caller) IP phone and the called IP phone. After that, the connection and call are started. This process is generally called a negotiation process. The negotiation process is performed using, for example, a VoIP (Voice over Internet Protocol) system that is currently commercially available.

  This SIP call control includes a call control command called an INVITE message. The INVITE message is the first control message sent to the destination from the IP phone on the calling side. In this message, the destination address, caller address, communication capability information including codec related to voice and video, etc. are called for each IP phone. This information is used as ancillary information, and the negotiation process is performed using this command.

  On the other hand, in recent years, the number of offices that introduce IP telephones with low communication charges in order to reduce communication costs is increasing. In general subscriber telephones, services provided by telecommunications carriers such as representative number incoming calls, group incoming calls, absence registration and absence transfer services are substantial. There is also an example in which a similar function is installed in a private branch exchange installed in a company. If the group incoming function can be set even when an IP telephone system is introduced, it is convenient to connect an incoming telephone to any IP telephone set in the group and answer it.

  For example, the following Patent Document 2 (Japanese Patent Application Laid-Open No. 2004-235778) discloses an IP telephone system using the SIP system. According to such a SIP system, it is possible to construct an IP telephone system having various functions such as a proxy response function, an automatic transfer function, and a simultaneous call function. Accordingly, a system in which a group telephone number and a plurality of IP telephones to which a call received to the group telephone number is connected is set as a group, and an incoming call for the group telephone number is received by any of the group-set IP telephones. Can do.

  In an IP telephone system having a group incoming call function, an IP telephone connected to the system is usually set with a personal telephone number in addition to a group telephone number, so that both telephone numbers can be sent and received. Similarly to a general subscriber telephone, the telephone is provided with an incoming call history recording function for recording an incoming call when there is no call as an incoming call history.

Various telephones that record incoming histories are known. For example, in the following Patent Document 3 (Japanese Patent Laid-Open No. 2002-1225012), the importance level of an unanswered incoming call unanswered call is determined based on a predetermined criterion, and the incoming unanswered call determined to be important A telephone device is disclosed in which a call is displayed with a display image different from that of a normal unanswered call.
JP 2004-147101 A JP 2004-235778 A JP 2002-1225012 A

  As described above, in a telephone system having a group incoming function, not limited to IP telephones, a plurality of telephone numbers such as a personal telephone number and a group telephone number are set for a telephone connected to the system. Will be. As described above, when storing a call history in a telephone having a plurality of phone numbers, the call history itself is handled as a single file, and stored in the call history storage unit provided in the phone in the order of arrival without distinction of the call numbers. It will be done.

  By the way, in a telephone set with a personal telephone number and a group telephone number, a call received to the group telephone number can be answered by any telephone belonging to the group, and is therefore always an incoming call for itself. Not necessarily. On the other hand, a call that arrives at a personal phone number is almost a call for yourself.

  In such a case, the number of incoming histories that can be stored in the incoming history storage unit is limited and not infinite, so some users do not store incoming histories for group phone numbers, and only incoming calls to personal phone numbers are received. There is a demand for memorizing history. Also, if you only store the incoming call history for your personal phone number, you can refer only to the incoming call history even when referring to the incoming call history, and you can identify the incoming call history that is not addressed to you from a mix of incoming calls. This is convenient.

  In addition, since the capacity of the incoming call history storage unit is limited, if there is an incoming call exceeding the maximum number of records that can be stored, the oldest incoming call history is stored regardless of whether the user has referred to the incoming call history. It is deleted from the incoming call history storage unit and a new incoming call history is stored. Therefore, if the incoming call history which is not necessary for the user is stored, the really necessary incoming call history is overflowed and deleted, and a situation in which the incoming call history required by the user cannot be referred to occurs. Furthermore, there is a possibility that the ratio of the number of useful histories to the maximum number of histories that can be stored may be remarkably reduced. In such a case, the incoming call history itself cannot be effectively used.

  However, in the conventional telephone set disclosed in Patent Document 3, even if the telephone set has a plurality of telephone numbers, the incoming call history itself is treated as a single file and stored in a predetermined incoming call history storage unit. However, it is not allowed to customize to selectively store the incoming call history according to the usage form of the user, and it is not possible to store only incoming calls to the personal phone number as the incoming call history. Existed.

  In a telephone capable of setting a plurality of telephone numbers, a criterion for determining whether or not a missed call history for each telephone number is useful differs for each user. For example, some people need a missed call history for the same group telephone number, and others do not.

As a result of various studies to solve the above problems, the inventor of the present application has provided an incoming call history setting means for setting whether to store a missed call history in a memory for each telephone number set in the telephone. Based on this, when the configuration is such that the telephone side automatically determines whether or not to leave a missed call history when a missed call occurs, the above problem can be solved and the present invention has been completed. Is.

  That is, the present invention has an object to solve the above-mentioned problems, and in a telephone capable of setting a plurality of telephone numbers, whether or not the user records the incoming call history for each incoming telephone number according to the usage form. It is an object of the present invention to provide a telephone and an IP telephone system that can set the above.

In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is
In a phone that can set multiple phone numbers such as personal phone numbers and group incoming phone numbers on the same phone,
The telephone has an incoming call history setting unit for setting whether to leave an incoming call history for each telephone number set in the telephone, a memory for storing a missed call history, and a memory for a missed call in the memory. An incoming call history storage control unit for storing the incoming call history,
The incoming call history control unit detects an incoming phone number when an incoming call is made to the telephone, and stores the incoming call history in the memory with reference to the telephone number set in the incoming call history setting unit. And

  According to claim 2 of the present application, in the telephone according to claim 1, the telephone number set for the telephone is at least one of a group telephone number, a personal telephone number, an external telephone number, and an extension telephone number. It is the above.

  The invention according to claim 3 of the present application is the telephone according to claim 1 or 2, wherein the incoming call history setting unit sets a storage period for storing the incoming call history for each telephone number set in the telephone. The incoming call history control unit is configured to detect the incoming phone number when there is an incoming call when the telephone is absent, and refers to the telephone number set in the incoming call history setting unit and receives the incoming call history in the memory. Is stored, and the missed call history after the retention period is deleted with reference to the retention period set in the incoming call history setting unit.

  The invention according to claim 4 of the present application is characterized in that in the telephone set according to claim 1, the telephone set is an IP telephone set.

  The invention according to claim 5 of the present application is characterized in that in the IP telephone system having the telephone according to claim 4, incoming calls to the IP telephone are connected via a call control server.

In the invention according to claim 1, the telephone sets an incoming call history setting unit for setting whether or not to leave an incoming call history for each telephone number set in the telephone, a memory for storing a missed call history, and a missed call An incoming call history storage control unit for storing an incoming call history in the memory when there is,
The incoming call history control unit detects an incoming phone number when there is a missed call on the telephone, and stores the incoming call history in the memory with reference to the telephone number set in the incoming call history setting unit.

  According to such a configuration, the user of the telephone can arbitrarily select the storage of the incoming call history for each telephone number according to the usage pattern, and only the incoming call history that the user thinks necessary can be left. become able to. For this reason, it is possible to effectively use the limited memory of incoming call history, and to reduce the risk that the required incoming call history will be deleted before reference. Since only the history is stored, the history to be referred to can be easily identified.

  In the invention according to claim 2, in the telephone according to claim 1, the telephone number set for the telephone is at least one of a group telephone number, a personal telephone number, an external telephone number, and an extension telephone number. Therefore, the user can arbitrarily set the incoming call history for each telephone number according to the usage form of each telephone number.

  In the invention according to claim 3, in the telephone according to claim 1 or 2, the incoming call history setting unit can set a retention period for saving the incoming call history for each telephone number set in the telephone. The incoming call history control unit deletes the missed call history that has passed the storage period with reference to the storage period set in the incoming call history setting unit.

  According to such a configuration, if the storage period of the group incoming call history is set to be short, the group incoming call history after the set period is automatically deleted, and the highly necessary incoming call history is deleted from the memory. Inconvenience can be improved. In addition, if a desired period is set for the missed call history storage period for the personal phone number, the memory capacity of the memory can be used effectively according to the usage status of the telephone.

  In the inventions according to claims 3 and 4, in the IP telephone and the IP telephone system, it is possible to leave only an incoming call history that the IP telephone user considers necessary. For this reason, it is possible to effectively use the limited memory of incoming call history, and to reduce the risk that the required incoming call history will be deleted before reference. Since only the history is stored, the history to be referred to can be easily identified.

  Hereinafter, specific examples of the present invention will be described in detail with reference to examples and drawings. In the following embodiment, an IP telephone system having a group incoming call function will be described as a specific example. This embodiment is an example for embodying the technical idea of the present invention. Is not intended to be specific to this IP telephone system, and is equally applicable to telephone systems of other embodiments within the scope of the claims, such as a private telephone system having a telephone capable of setting a plurality of telephone numbers. It is possible.

  FIG. 1 is a block diagram illustrating a configuration of an IP telephone system and an IP telephone having a representative number incoming call function according to the first embodiment of the present invention. In the following description, the IP telephone is simply referred to as a terminal. An IP telephone system having a representative number incoming call function according to an embodiment of the present invention includes terminals A to N which are IP telephones 50, a call control server 40, and a gateway 30. The call control server 40 can use a SIP server to which a SIP (Session Initiation Protocol) protocol is applied.

  Calls from terminal A to terminal N are made via the gateway 30. A call with the subscriber telephone 15 connected to the telephone network 12 is connected to the terminals A to N under the call connection control of the call control server 40. Calls between terminals installed in other IP telephone systems connected to the router 17 are transmitted from the terminal A to the terminal under the call connection control of the call control server 40 via the Internet network 11 and the router 20. N. In FIG. 1, the configuration of IP telephones other than the terminal A is omitted, but the configuration is the same as that of the terminal A.

  In the present invention, when an incoming call is received at a predetermined group telephone number, for example, a terminal A to a terminal D are set as group receiving terminals, and any one of the terminals is called It shall be. Accordingly, in addition to the group telephone number, terminals A to D are set with personal telephone numbers assigned to individual users, and the call control server 40 can receive incoming calls to the group telephone numbers. Incoming calls to personal phone numbers are sent to the corresponding terminals.

  In addition to the control circuit 401, the call control server 40 includes an incoming call control unit 403 that controls incoming calls to each terminal, and a terminal telephone number storage unit 404 that stores a telephone number set for each terminal.

  The terminal telephone number storage unit 404 stores the telephone numbers set for the terminals A to N accommodated in the IP telephone system 10. As shown in FIG. 2, the stored data includes a group telephone number set in each terminal in the telephone number setting A, and a personal telephone set in each terminal in the telephone number setting B and telephone number setting C. Numbers and home phone numbers are stored. The incoming call control unit 403 performs control to connect the incoming call to the corresponding terminal by using the terminal ID and the telephone number stored in the terminal phone number storage unit 404.

  In FIG. 2, the telephone number setting A stores the group telephone number set for each terminal and the incoming order. For example, in this embodiment, the terminal IDs of the terminals A to D are registered in the group telephone number ****, and the incoming order “1” to “4” is set in order to the terminal A to the terminal D as the incoming order. Yes. When a plurality of group telephone numbers are provided, a group of terminals to be received and an incoming order are set in the same manner as terminals A to D.

  On the other hand, each of the terminals A to N has an incoming call history setting unit 505 for setting whether to leave an incoming call history for each set telephone number, an incoming call history storage control unit 506, and a memory 507 functioning as an incoming call history storage unit. As with an ordinary IP telephone, a control circuit 501, a handset 502, a display unit 503, and an input unit 504 are provided. The control circuit 501 includes a microprocessor having a RAM and a ROM, and controls each unit based on a control program stored in the ROM. The handset 502 includes a microphone and a speaker and is used for a call.

  The input unit 504 has alphanumeric keys, function keys, and the like, and is used for various operations such as telephone number input and outgoing calls. The display unit 503 includes a liquid crystal display unit and the like, and is used for various setting screens of the terminal 50 and display of incoming calls.

  Each terminal A to terminal N can set in the incoming call history setting unit 505 whether or not to store the incoming call history in the memory 507 when there is a missed call for each telephone number. The incoming call history storage control unit 506 detects an incoming phone number (a group phone number or a personal phone number set in the terminal 50) when a call is missed from the call control server, and is set in the incoming call history setting unit 505. Control is performed to store the incoming call history in the memory 507 by referring to the telephone number.

  For example, as shown in FIG. 2, the terminal A is set with a group telephone number (group ****) and a personal telephone number (**-***-****). As shown in FIG. 3, the user of terminal A stores “OFF” (does not store the incoming call history) in the group phone number history storage in the incoming call history setting unit 505 and “ON” (incoming call history) in the personal phone number history storage. Is stored). However, the incoming call history (that is, the call that is not a missed call) when the telephone user actually answers is stored regardless of the setting.

  This setting means that the incoming call history only for missed calls to the personal phone number is stored, and the incoming call history storage control unit 506 detects the incoming phone number when there is an incoming call from the call control server 40, and If it is a missed call to the telephone number, the incoming call history is stored in the memory 507. If both the group phone number and personal phone number are set to store the incoming call history (both set to “ON”), the incoming call is received regardless of whether the personal phone number or group phone number is missed. The history storage control unit 505 stores the incoming call history in the memory 507.

  FIG. 4 is a diagram showing an example of an incoming call history stored in the memory 507 (incoming call history storage unit) as described above. In FIG. 4, terminal 50 (any one of terminal A to terminal D) has its own telephone number “9999” (group telephone number), “1111” (personal telephone number for one company), “2222” (personal telephone number). 2 Home / Family) is set. In the incoming call history setting unit 505, “ON” is set for all the set telephone numbers, and the incoming call history storage control unit 506 stores all incoming call histories in the memory 507 regardless of which telephone number is missed. Remember.

  As shown in FIG. 4, the structure of the incoming call history is as follows: history number, type (absent), incoming time, own phone number (incoming phone number), destination phone number, destination name (if not notified, name Notification is stored). As for the history number, the latest incoming call history is “1”, and a sequential number is sequentially added from a new incoming call. When the latest incoming call history is stored, the latest incoming call history becomes “1”. Is controlled to move down.

In FIG. 4, the maximum number of histories is simplified to 5 for the sake of explanation. Here, it is assumed that the user of this terminal does not need the missed call history for the group telephone number “9999”.
In this case, three of the five calls are missed call histories to the group telephone number that is not necessary, and conversely, only two calls are saved to the useful personal telephone numbers “1111” and “2222”. Will not be. For this reason, the use efficiency of the incoming call history is very poor, and accordingly, the visibility of the incoming call history list is also deteriorated.

  Further, when a missed call to the group telephone number “9999” further occurs from this state, the missed call history to the personal phone number “2222”, which is the oldest call history, overflows from the maximum number of records, Regardless of whether the user has already referred to this history, it is forcibly deleted from the incoming call history list.

  Therefore, even if a person who has left the seat returns to his / her seat and sees the incoming call history by looking at the “Missed call” pop-up message, the missed call history has already been lost, making it impossible to confirm. There is also the risk of suffering disadvantages.

  Therefore, if the user is set not to store the missed call history to the group phone number “9999”, the history of all incoming calls to the personal phone numbers “1111” and “2222” that the user has determined to be useful Only the incoming call history to the group telephone number “9999” that the user actually answered (the incoming call record of the call that was answered instead of the missed call) is saved, and the incoming call history storage unit can be used effectively, The problem can be solved.

  Next, the control in which the call control server 40 connects incoming calls to the group telephone numbers to the terminals A to D will be described. When there is an incoming call for the group telephone number, the incoming call control unit 403 searches and determines a terminal to which the incoming call is connected based on the information set in the terminal telephone number storage unit 404. In the case of the sequential search method, the order of arrival set in the terminals A to D means priority, and the terminal is searched according to this priority, and if it is available, control is performed to connect the incoming call to that terminal. .

  That is, the search is performed in order from the terminal with the highest priority, and if that terminal is empty, it is immediately connected to that terminal. Therefore, in this case, the search is performed in order from the terminal A. If the terminal A is empty, the group incoming call is connected to the terminal A. If terminal A is busy and not empty, a terminal with priority “2” (here, terminal B) is searched. If terminal B is empty, terminal B is connected.

  The search order may be a round robin method. The incoming order of the terminals set in the incoming order storage unit means a selection order in which the first terminal to be searched is changed every time a representative number is received. For the first incoming representative number, terminal A first The terminal B is searched first for the second incoming call, the terminal C for the third incoming call, and the terminal D for the fourth incoming call. When the search order is completed, the terminal A returns to the top for the fifth incoming call, and the terminal A is searched first. If the searched terminal is busy and not available, the next terminal is searched, and the incoming representative number is connected to the empty terminal.

  As described above, in the round robin method, the incoming order of the terminals set in the incoming order storage unit is an order that is sequentially shifted every time there is an incoming representative number, and an order that indicates a selection order for searching for an empty IP phone. It is. In the case of the sequential search method, the terminal with the highest priority is received with the highest priority, and the number of incoming calls to the terminal is the largest. On the other hand, in the case of the round robin method, incoming calls to each terminal can be made almost uniform.

  The incoming call control to the group telephone number is not limited to the above method, but may be simultaneous incoming call control. In a group incoming call, when a group number is received, all the telephones in the group ring all at once, and if any telephone responds, all the other non-response telephones are released.

  As described above in detail, according to the telephone system of the present invention, a user of a telephone set with a plurality of telephone numbers can arbitrarily select storage of the incoming call history for each telephone number according to the usage mode. As a result, only the incoming call history that the user thinks necessary can be left. For this reason, it is possible to effectively use the limited memory of incoming call history, and to reduce the risk that the required incoming call history will be deleted before reference. Since only the history is stored, the history to be referred to can be easily identified.

  In addition, since the memory that stores the missed call history has a limited storage capacity, if you set to save the incoming call history to the group phone number, set the retention period for the group incoming call history to a short time and the set period will elapse If the group incoming call history is automatically deleted, it is possible to improve the inconvenience that a highly necessary incoming call history is deleted from the memory. In addition, if the storage period of the missed call history to the personal phone number is set to a desired period, the memory capacity of the memory can be used effectively according to the usage status of the telephone.

  For this purpose, in the incoming call history setting section 505, the necessity of saving the missed call history for each phone number is set, and the retention period of the missed call history can be set for each group phone number or other phone number. What is necessary is just to comprise so that the log | history storage control part 506 may perform control which deletes (deletes) the missed call history which passed the preservation | save period, when storing the missed call history in the memory 507.

  In the above embodiment, the IP telephone system has been described as an example. However, the present invention is not limited to this and can be applied to a general private telephone system. Further, the above embodiment has been described with reference to the control of storing the incoming history to the group telephone number and the personal telephone number. However, if the incoming call is missed to the external telephone number, the incoming call history is saved and Do not save incoming call history if there is, or save incoming call history if missed call to company phone number, do not save incoming call history if missed call to home phone number It is also possible to do this.

  The present invention focuses on the feature of the group that other IP telephones can answer incoming calls. However, as a feature of this group, when a user who has seen a missed call history returns a response, It is conceivable to do a double return response without knowing that another IP telephone has returned the response.

  For this reason, when a response is returned, it is desirable to notify that the server or the IP telephone apparatus has returned the response to another IP telephone in the same group. Furthermore, it is desirable to automatically perform this notification. As a method for this, a method of recognizing that a call operation related to notification of a missed call history as a return response and notifying other IP phones of the return response can be considered. . For example, when answering the second call on the missed call history display, if the call key is pressed after moving the cursor to the second position or after pressing the number 2 key, it is determined that the call is returned and the call is made from the numeric keypad. When a number is input, it can be determined that the response is not judged as a return response. Also, the return response notification method may be deletion of the missed call history, and the number of the IP telephone that made the return response may be displayed belonging to the corresponding missed call number so that it can be known who responded.

It is a block diagram which shows the structure of the representative number incoming call | requirement function IP telephone system concerning the Example of this invention. It is a figure which shows an example of data structures, such as a setting telephone number of each terminal memorize | stored in the terminal telephone number memory | storage part of a call control server. It is a figure which shows an example of the information set to the incoming call history setting part of a terminal. It is a figure which shows an example of the incoming call history memorize | stored in an incoming call history memory | storage part.

Explanation of symbols

10 .... IP telephone system 11 .... Internet network 12 .... Telephone network 15 .... Subscriber phone 17, 20 .... Router 30 ...... Gateway 40 ... Call control server 401... Control circuit 403... Incoming call control unit 404... Terminal telephone number storage unit 50.
501 ... Control circuit 502 ... Handset 503 ... Display unit 504 ... Input unit 505 ... Incoming history setting unit 506 ... Incoming history storage control unit 507 ... Memory (incoming history storage) Part)

Claims (5)

In a phone that can set multiple phone numbers such as personal phone numbers and group incoming phone numbers on the same phone,
The telephone has an incoming call history setting unit for setting whether to leave an incoming call history for each telephone number set in the telephone, a memory for storing a missed call history, and an incoming call to the memory when there is a missed call An incoming call history storage control unit for storing the history,
The incoming call history control unit detects an incoming phone number when an incoming call is made to the telephone, and stores the incoming call history in the memory with reference to the telephone number set in the incoming call history setting unit. Phone. The telephone set according to claim 1, wherein the telephone number set for the telephone is at least one of a group telephone number, a personal telephone number, an external telephone number, and an internal telephone number. The incoming call history setting unit is configured to be able to set a retention period for saving the incoming call history for each telephone number set in the telephone, and the incoming call history control unit is configured to receive an incoming call when the telephone is out of office. Detecting the incoming telephone number and referring to the telephone number set in the incoming call history setting section to store the incoming call history in the memory, and referring to the storage period set in the incoming call history setting section and passing the storage period 3. The telephone according to claim 1, wherein the missed call history is deleted. The telephone set according to claim 1, wherein the telephone set is an IP telephone set. 5. An IP telephone system having the IP telephone according to claim 4, wherein an incoming call to the IP telephone is connected via a call control server.

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