JP2007208446A - Ip phone system with main number call termination function, call control server, and ip phone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an IP phone system with a main number call termination function capable of connecting a main number call termination to an IP phone with excellent voice quality. <P>SOLUTION: The IP phone system 10 includes: a call receiving order storage section 404 for establishing a call receiving order to search idle IP phones among a plurality of IP phones; a main number call termination control section 403 for searching the IP phones in the call receiving order established to the call receiving order storage section 404 to connect the main number call termination to the searched idle IP phone; and a voice quality monitor section 402 for monitoring voice quality of each IP phone. Each IP phone is provided with a voice quality detection section 506 for calculating a prescribed parameter value denoting preset voice quality at an end of a speech, and the voice quality monitor section 402 changes the call receiving order established to the call receiving order storage section 402 for IP phones whose parameter value detected by the voice quality detection section 506 is lower than a prescribed threshold value, and the main number call termination control section 403 searches idle IP phones according to the revised call receiving order and connects a main number call termination to the searched IP phone. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an IP telephone system, a call control server, and an IP telephone having a representative number receiving function, and in particular, monitors the voice quality of each IP telephone, and receives an incoming call of each IP telephone based on the quality of the voice quality. The present invention relates to an IP telephone system, a call control server, and an IP telephone that are controlled so as to be received by an IP telephone having good voice quality by changing the order.

  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 caller side to the destination. In this message, the destination address, caller address, communication capability information, caller name, company name, etc. are issued for each IP phone. It can be sent to the destination as supplementary information for a call.

  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.

  Recently, offices that introduce IP telephones with low communication charges to reduce communication costs are increasing. In general subscriber phones, services provided by communication carriers such as representative number reception, absence registration, and absence transfer services are enhanced. There is also an example in which a similar function is installed in a private branch exchange installed in a company. If the representative number receiving function can be set even when IP is introduced, it is convenient that any IP telephone can answer a call received at the representative number.

For example, the following Patent Document 2 (Japanese Patent Laid-Open No. 2004-235778) discloses an IP telephone system using the SIP system. According to such a SIP system, an IP telephone system having various functions such as a proxy response function, an automatic transfer function, and a simultaneous call function can be constructed. Therefore, it is possible to provide a system in which a call received at a representative number is received by each IP telephone connected to the system or a plurality of IP telephones to which a representative number is received.
JP 2004-147101 A JP 2004-235778 A

  By the way, in a subscriber telephone system, since a call signal is transmitted and received as an analog voice signal via a dedicated telephone line network, generally a good voice quality is ensured. On the other hand, in an IP telephone system, a call signal is converted into a digital signal and transmitted / received by packet communication via a general data communication network. For this reason, it is known that the voice quality may deteriorate due to the processing load of a CPU such as a microprocessor that controls the IP telephone and other factors.

  Various controls of the IP telephone are performed by a CPU such as a microprocessor as described above. The CPU processing capacity required for a call is the connection media (voice codec, packet length, etc.) determined with the other party and the functions (echo canceller, speech speed conversion, tone) executed by the own IP phone. Transmission, tone detection, three-party call, etc.) The processing speed of the CPU is determined depending on the CPU performance (clock frequency or the like), and is expressed using a MIPS (Million Instructions Per Second) value or the like.

For example, if the processing capacity of the CPU that constitutes the control unit is insufficient during a call in an IP phone and the voice packet transmission / reception processing cannot be performed normally, the sound may be interrupted or the sound quality may be degraded. A fatal failure occurs. Also, the voice quality of IP telephones is degraded due to various network conditions such as packet loss, delay, and jitter. Furthermore,
If the CPU's voice processing load is extremely high and the CPU is occupied by the voice processing, for example, the drawing process on the display unit LCD becomes extremely slow, and drawing collapse occurs. Problems such as deterioration of key response occur.

  In the representative number reception function used in an enterprise IP telephone system or the like, when a representative number is received, the call control server selects one of the available (not busy) telephones from a plurality of IP telephones belonging to the representative number. It is possible to make incoming calls. There are several types of incoming call selection methods such as a sequential search method and a round robin method, which are selectively used according to the purpose and application. Regardless of the selection method, the selection order is fixedly set and is not normally changed.

  In the sequential search method, terminal A to terminal D are set with an incoming call priority, and when there is an incoming call at a representative number, the terminals are searched in order of the incoming call priority to find an empty terminal (a terminal that is not busy) and connect. It is a method. In the case of this system, a terminal having a higher priority is received with the highest priority, and the number of incoming calls to that terminal is the largest.

  On the other hand, the round robin method is a method in which only the selection order is set without assigning the arrival priority order to the terminals, and the terminal selection order is shifted and connected to different terminals each time a representative number is received. In the case of this method, incoming calls to each terminal can be made substantially uniform.

  Regardless of the selection method, even if the terminal selected for incoming calls falls into a state in which the voice quality is significantly lowered due to some factor, the terminal is connected to the terminal selected for incoming calls. However, in the IP telephone system and the like disclosed in Patent Document 2 above, no consideration is given to how to deal with the deterioration of voice quality. In the IP telephone connected to the incoming call to the representative number, the voice quality is not considered. However, there was a fatal problem such as a sound interruption that cut off the voice.

  The inventor of the present application has conducted various studies to solve the above problems, and as a result, in an IP telephone system having a representative number receiving function, the voice quality of each IP telephone that receives a call to the representative number is monitored, Based on the quality, it is possible to make incoming calls to IP phones with good voice quality by changing the incoming order of each IP phone, and the present invention has been completed by conceiving that the above problems can be solved. Is.

  That is, the present invention aims to solve the above problems, and in an IP telephone system having a representative number receiving function, an IP telephone system and a call control server capable of receiving a representative number to an IP telephone having good voice quality And an IP telephone.

In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is
An incoming order storage unit that sets an incoming order to search for an empty IP telephone among a plurality of predetermined IP telephones, and an IP telephone is searched in the order of incoming calls set in the incoming order storage part, and a representative number is received by an empty IP telephone. In an IP telephone system having a representative number incoming call function with a representative number incoming call control unit for connecting
The IP telephone system includes a voice quality monitoring unit that monitors voice quality of each IP telephone,
The plurality of IP telephones includes a voice quality detection unit that calculates a value of a predetermined parameter indicating voice quality set in advance at the end of a call,
The voice quality monitoring unit changes the incoming call order set in the incoming call order storage unit for an IP telephone whose parameter value detected by the voice quality detection unit is lower than a predetermined threshold, and the representative number incoming call control unit is , Searching for an empty IP telephone among a plurality of IP telephones according to the changed incoming order, and connecting a representative number incoming call.

The invention according to claim 2 of the present application is the IP telephone system according to claim 1,
The incoming order stored in the incoming order storage unit is a priority indicating a priority order for searching for an empty IP phone,
The voice quality monitoring unit changes the incoming call order set in the incoming call order storage unit for an IP telephone whose parameter value detected by the voice quality detection unit is lower than a predetermined threshold, and the representative number incoming call control unit is , Searching for an empty IP telephone among a plurality of IP telephones according to the changed incoming order, and connecting a representative number incoming call.

The invention according to claim 3 of the present application is the IP telephone system according to claim 1,
The incoming order stored in the incoming order storage unit is an order that is sequentially shifted every time there is a representative number incoming call, and is an order that indicates a selection order for searching for an empty IP phone,
The voice quality monitoring unit changes the incoming call order set in the incoming call order storage unit for an IP telephone whose parameter value detected by the voice quality detection unit is lower than a predetermined threshold, and the representative number incoming call control unit is , Searching for an empty IP telephone among a plurality of IP telephones according to the changed incoming order, and connecting a representative number incoming call.

The invention according to claim 4 of the present application is the IP telephone system according to any one of claims 1 to 3,
The IP telephone system further includes a caller detection unit having a caller number registration unit that registers a desired caller telephone number,
When the caller detection unit detects an incoming representative number from the caller telephone number registered in the caller number registration unit, the voice quality monitoring unit sets the parameters detected by the voice quality detection unit. The incoming call order set in the incoming call order storage unit is changed for an IP telephone whose value has fallen below a predetermined threshold value, and the representative number incoming call control part is configured to use a free IP of a plurality of IP telephones according to the changed incoming call order It is characterized by searching for a telephone and connecting an incoming representative number.

The invention according to claim 5 of the present application is
A call control server in an IP telephone system for controlling an IP telephone including a voice quality detection unit that calculates a value of a predetermined parameter indicating voice quality set in advance at the end of a call,
The call control server includes an incoming order storage unit that sets an incoming order for searching for an empty IP telephone among a plurality of predetermined IP telephones, and searches for IP telephones in the order of incoming calls set in the incoming order storage part. A representative number incoming call control unit for connecting the incoming representative number to the IP phone, and a voice quality monitoring unit for monitoring the voice quality of each IP phone,
The voice quality monitoring unit changes the incoming call order set in the incoming call order storage unit for an IP telephone whose parameter value detected by the voice quality detection unit is lower than a predetermined threshold, and the representative number incoming call control unit is , Searching for an empty IP telephone among a plurality of IP telephones according to the changed incoming order, and connecting a representative number incoming call.

The invention according to claim 6 of the present application is the call control server according to claim 5,
The incoming order stored in the incoming order storage unit is a priority indicating a priority order for searching for an empty IP phone,
The voice quality monitoring unit changes the incoming call order set in the incoming call order storage unit for an IP telephone whose parameter value detected by the voice quality detection unit is lower than a predetermined threshold, and the representative number incoming call control unit is , Searching for an empty IP telephone among a plurality of IP telephones according to the changed incoming order, and connecting a representative number incoming call.

The invention according to claim 7 of the present application is the call control server according to claim 6,
The incoming order stored in the incoming order storage unit is an order that is sequentially shifted every time there is a representative number incoming call, and is an order that indicates a selection order for searching for an empty IP phone,
The voice quality monitoring unit changes the incoming call order set in the incoming call order storage unit for an IP telephone whose parameter value detected by the voice quality detection unit is lower than a predetermined threshold, and the representative number incoming call control unit is , Searching for an empty IP telephone among a plurality of IP telephones according to the changed incoming order, and connecting a representative number incoming call.

The invention according to claim 8 of the present application is the call control server according to claims 5 to 7,
The call control server further includes a caller detection unit having a caller number registration unit that registers a desired caller telephone number,
When the caller detection unit detects an incoming representative number from the caller telephone number registered in the caller number registration unit, the voice quality monitoring unit sets the parameters detected by the voice quality detection unit. The incoming call order set in the incoming call order storage unit is changed for an IP telephone whose value has fallen below a predetermined threshold value, and the representative number incoming call control part is configured to use a free IP address among a plurality of IP telephones according to the changed incoming call order. It is characterized by searching for a telephone and connecting an incoming representative number.

The invention according to claim 9 of the present application is
An incoming order storage unit that sets an incoming order to search for an empty IP telephone among a plurality of predetermined IP telephones, and an IP telephone is searched in the order of incoming calls set in the incoming order storage part, and a representative number is received by an empty IP telephone. And a voice quality monitoring unit that monitors the voice quality of each IP phone, and the voice quality monitoring unit sets the IP phone whose voice quality has deteriorated in the incoming order storage unit. And the representative number incoming call control unit searches for an empty IP telephone among a plurality of IP telephones according to the changed incoming order, and connects the incoming representative number. An IP phone connected to a server,
The IP telephone includes a voice quality detection unit that calculates a value of a predetermined parameter indicating a voice quality set in advance at the end of the call to the plurality of IP telephones, and the IP telephone of the predetermined parameter detected by the voice quality detection unit The value is transmitted to the voice quality monitoring unit.

The invention according to claim 10 of the present application is
An incoming order storage unit that sets an incoming order to search for an empty IP telephone among a plurality of predetermined IP telephones, and an IP telephone is searched in the order of incoming calls set in the incoming order storage part, and a representative number is received by an empty IP telephone. And a voice quality monitoring unit that monitors the voice quality of each IP phone, and the voice quality monitoring unit sets the IP phone whose voice quality has deteriorated in the incoming order storage unit. And the representative number incoming call control unit searches for an empty IP telephone among a plurality of IP telephones according to the changed incoming order, and connects the incoming representative number. An IP phone connected to a server,
The IP telephone includes a voice quality detection unit that calculates a value of a predetermined parameter indicating a voice quality set in advance at the end of the call to the plurality of IP telephones, and the IP telephone of the predetermined parameter detected by the voice quality detection unit An IP telephone, characterized in that, when a value falls below a predetermined threshold, a message indicating that voice quality has been lowered is transmitted to the voice quality monitoring unit.

  In the inventions according to claims 1 to 3, the incoming order storage unit that sets the incoming order for searching for an empty IP telephone among a plurality of predetermined IP telephones, and the incoming order IP set in the incoming order storage unit In an IP telephone system having a representative number incoming call control function including a representative number incoming call control unit for searching a telephone and connecting a representative number incoming call to an empty IP telephone, the IP telephone system monitors the voice quality of each IP telephone. A plurality of IP telephones, each of the plurality of IP telephones includes a voice quality detection unit that calculates a value of a predetermined parameter indicating a preset voice quality at the end of the call, and the voice quality monitoring unit includes the voice quality detection unit The incoming call order set in the incoming call order storage unit is changed for the IP telephone whose value of the parameter detected by the mobile phone falls below a predetermined threshold value, and the representative number incoming call control unit changes the incoming call order. It searches the IP telephone free of the plurality of the IP telephone according to the incoming order to connect the representative number call.

  With this configuration, the call control server refers to the voice quality of each terminal when receiving an incoming representative number to any of a plurality of IP telephones. The search is performed by changing the priority order or selection order set in order to the lowest order. As a result, it is possible to make a call to a terminal having a voice quality of a predetermined level or more without receiving a call to a terminal whose voice quality is deteriorated.

  According to a fourth aspect of the present invention, in the IP telephone system according to any one of the first to third aspects, a caller detection unit having a caller number registration unit in which a desired caller telephone number is registered. And when the caller detection unit detects an incoming representative number from a caller telephone number registered in the caller number registration unit, the voice quality monitoring unit detects the voice quality detection unit For the IP telephone whose parameter value has fallen below a predetermined threshold, the incoming order set in the incoming order storage unit is changed.

  With this configuration, when there is an incoming representative number from the caller who registered the source telephone number, the call control server sets the voice quality of each terminal when receiving the incoming representative number to any of the plurality of IP phones. If there is an IP telephone whose voice quality is degraded, the search is performed by changing the priority order or selection order set in the order of arrival to the lowest order. As a result, it is possible to make a call to a terminal having a voice quality of a predetermined level or more without receiving a call to a terminal whose voice quality is deteriorated.

  Further, in the inventions according to claims 5 to 8, it becomes possible to provide a call control server constituting the IP telephone system according to claims 1 to 4, respectively. In the invention according to claim 10, since the IP telephone is configured to calculate a value of a predetermined parameter indicating a preset voice quality at the end of the call and notify the call control server every time a call is made. It becomes possible to provide an IP telephone constituting the IP telephone system according to the first to fourth aspects.

  Hereinafter, specific examples of the present invention will be described in detail with reference to examples and drawings. However, the embodiments described below exemplify an IP telephone system having a representative number receiving function for embodying the technical idea of the present invention, and are intended to specify the present invention to this IP telephone system. However, the present invention is equally applicable to the IP telephone system of other embodiments included in the scope of claims.

  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 is configured by terminals A to D, 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 this embodiment, it is assumed that the IP telephone to be connected when an incoming call is received at the representative number is set so that terminal A to terminal D are received as one of the representative number receiving groups. As described above, there are a sequential search method and a round robin method as a method for controlling which terminal in the representative number incoming call group receives a call.

  In the present invention, means for monitoring the voice quality of each normal terminal during a call is provided, and the quality of the voice quality is reflected in the selection order when the terminal to which the representative number is connected is selected. By doing so, the representative number incoming call is not connected to a terminal whose voice quality is deteriorated, and a phenomenon such as a call interruption is not generated. In this case, the incoming control method may be either the sequential search method or the round robin method.

  Therefore, as shown in FIG. 1, the call control server 40 includes an incoming order storage unit 404, a voice quality monitoring unit 402, and a representative number incoming call control unit 403 in addition to the control circuit 401. A quality detection unit 506 is 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 voice quality detection unit 506 constantly calculates parameters indicating voice quality such as packet loss, delay, and jitter every time a call is made, and notifies the call control server 40 using SNMP (Simple Network Management Protocol) or the like at the end of the call.

  In the incoming order storage unit 404, as shown in FIG. 2, an IP telephone to which the representative number incoming call is connected is set, the terminal ID (IP address) and the incoming order are set, and the voice quality is stored. . For example, in this embodiment, the terminal IDs of the terminals A to D are registered, and the order of arrival “1” to “4” is set in order of the terminals A to D as the order of arrival.

  When there is an incoming call at the representative number, the representative number incoming call control unit 403 searches and determines a terminal to which the incoming call is connected based on the information set in the incoming call order 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, and if the terminal A is empty, the incoming representative number 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.

  In the case of the round robin method, the incoming order of the terminals set in the incoming order storage unit means a selection order in which the terminal to be searched first is changed every time a representative number is received. Terminal A is searched first, terminal B is searched for the second incoming call, terminal C is searched for the third incoming call, and terminal D is searched first 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 each terminal A to terminal D, parameters such as packet loss, delay, and jitter are set as parameters for detecting voice quality, and the voice quality detecting unit 506 always calculates the values of these parameters at the end of the call. Each time the call ends, this parameter value is notified to the call control server 40. As a protocol for notifying the parameter value to the call control server 40, a generally used SNMP (Simple Network Management Protocol) or the like can be used.

  The voice quality monitoring unit 402 receives notification of the voice quality detection data detected by the voice quality detection unit 506 for each call from each of the terminals A to D, and compares the voice quality with a predetermined threshold value to determine whether the voice quality is higher or lower than the threshold value. Monitor. Based on the monitoring result, the voice quality monitoring unit 402 records the voice quality of each of the terminals A to D in the incoming order storage unit 404. For example, as shown in FIG. 2, for each of the terminals A to D, “Level 1” is stored when the voice quality is equal to or higher than a predetermined threshold, and “Level 2” is stored when the voice quality is lower than the threshold.

  The representative number incoming call control unit 403 refers to the voice quality of each terminal and stores the voice quality of “level 2” when searching for the called terminal for incoming representative number based on the sequential search method or round robin method described above. If there is a terminal, the priority order or selection order set in the order of arrival is changed to the lowest order and the search is performed. As a result, it is possible to make a call to a terminal having a voice quality of a predetermined level or more without receiving a call to a terminal whose voice quality is deteriorated.

  Each terminal includes a control circuit 501, a handset 502, a display unit 503, an input unit 504, a notification unit 505, and a memory 507 in addition to the voice quality detection unit 506 in the same manner as a normal IP telephone. 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 501 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. The notification unit 505 has a function of notifying the user of various states of the terminal 50. For example, when the voice quality detection unit 506 detects a decrease in voice quality, the notification unit 505 displays a warning message on the display unit 503. Do.

  Next, the operation procedure of the call control server 40 when receiving the representative number of the IP telephone system 10 described above will be described with reference to the flowcharts of FIGS. FIG. 3 is a flowchart illustrating a procedure for the voice quality monitoring unit 402 to monitor the voice quality based on the voice quality detection data received from each of the terminals A to D.

  The voice quality monitoring unit 402 determines whether or not voice quality data has been received from the voice quality detection unit 506 of the terminal in the process of step S11. If not received, the process of step S11 is repeated. If the voice quality data is received, it is compared with a predetermined threshold value in the process of step S12 to determine whether the voice quality is equal to or higher than the predetermined threshold value.

  If the voice quality received from the terminal is equal to or higher than the predetermined threshold, the process proceeds to step S13, and level 1 is stored in the voice quality of the corresponding terminal in the incoming order storage unit 404. If the voice quality is lower than the threshold, the process proceeds to step S14. Level 2 is stored in the voice quality of the corresponding terminal in the sequential storage unit 404. Therefore, by referring to the voice quality level stored in the voice quality, it is possible to determine a terminal whose voice quality is degraded.

  FIG. 4 is a flowchart showing an example of a connection control procedure when a representative number is received. If there is a representative number incoming call in the process of step S21, the representative number incoming call control unit 403 proceeds to the process of step S22, refers to the incoming order storage unit 404, and the voice quality level is 2, that is, the voice quality is a predetermined threshold value. It is determined whether or not there is a terminal that does not satisfy.

  If there is no terminal whose voice quality does not satisfy the predetermined threshold level, the terminal is searched sequentially according to the information of the arrival order set in the arrival order storage unit 404, and if the terminal is free, the representative number is connected to that terminal. To do. If there is a terminal whose voice quality does not satisfy the predetermined threshold level, the representative number connection control unit 403 changes the incoming order of the terminal to the lowest in the process of step S25. Then, in the process of step S26, the terminal is sequentially searched according to the information of the incoming order changed as described above, and if the terminal is empty, the representative number incoming call is connected to the terminal.

  FIG. 5 is a flowchart showing another example of the connection control procedure when the representative number is received. If there is a representative number incoming call in the process of step S31, the representative number incoming call control unit 403 proceeds to the process of step S32, and selects a terminal to search according to the incoming order information set in the incoming order storage unit 404. Next, in the process of step S33, the incoming order storage unit 404 is referred to for the selected terminal, and it is determined whether or not the voice quality level is 2, that is, the voice quality is less than a predetermined threshold.

  If the voice quality of the selected terminal is equal to or higher than the predetermined threshold level, the process proceeds to step S35, and it is determined whether or not the terminal is in an idle state rather than busy. If it is available, the call for the representative number incoming call is connected to the terminal, and the process is terminated. If the terminal is not empty, the process returns to step S32 to select the next rank terminal to be searched in accordance with the arrival order information set in the incoming order storage unit 404, and the processes in and after step 33 are repeated.

  On the other hand, when the voice quality of the selected terminal is lower than the predetermined threshold in the process of step S34, the incoming order of the terminal is changed to the lowest in the process of step S37, and the process of step S32 is performed. Returning to FIG. 5, the terminal of the next order to be searched is selected according to the information of the incoming order set in the incoming order storage unit 404, and the processing from step 33 is repeated.

  In the procedures of the flowcharts of FIGS. 4 and 5, the search method for the empty terminal may be either the above-described sequential search method or round robin method. Also, the method of changing the incoming order of a terminal of level 2 voice quality is not limited to the method of changing the incoming order of the terminal to the lowest order as described above. Alternatively, a flag for prohibiting connection of the terminal may be temporarily stored and excluded from the search order, or the search for the terminal may be skipped during the search.

  In addition to the voice quality information of each IP telephone, it is also possible to perform connection control of the incoming IP telephone when the representative number is received in consideration of the destination information acquired by the calling number notification function. For example, when a representative number is received, a telephone number of a caller is referred to and a representative number incoming from a specific caller can be selected and connected to a terminal having good voice quality. With this configuration, the telephone number of the important customer is registered, and the incoming representative number from the important customer can be connected to a terminal with good voice quality.

  FIG. 6 is a diagram showing a configuration of an IP telephone system according to Embodiment 2 of the present invention configured to select and connect a terminal with good voice quality based on caller number detection. In the present embodiment, for the sake of easy understanding, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof will be omitted, and only elements different from those in the first embodiment will be described.

  In FIG. 6, the call control server 40 includes a caller number detection unit 405. The caller number detection unit can register the telephone number of a desired caller in a caller number registration unit (not shown in FIG. 6) shown in FIG.

  When there is an incoming representative number, the calling party number detecting unit 405 acquires the telephone number of the calling party from the calling number information, and compares it with the telephone number registered in the calling party number storage unit. When the representative number incoming call is a representative number incoming call from the telephone number registered in the calling party number registering unit, the representative number incoming control unit 403 is notified to that effect, and the representative number incoming control unit 403 in the first embodiment Control for selecting and connecting a terminal whose voice quality is equal to or higher than a predetermined threshold is performed in the same procedure as described above.

  In the first and second embodiments, each terminal transmits a voice quality detecting unit 506 to the call control server 40, and the voice quality monitoring unit 402 compares the predetermined threshold value to determine the voice quality. However, the voice quality detection unit 506 of each terminal compares the voice quality detection data with a predetermined threshold value, and notifies the call control server 40 when the predetermined threshold value is not reached. The voice quality monitoring unit 402 notifies the notification. It may be configured to receive and store in the incoming order storage unit that the voice quality is equal to or lower than a predetermined threshold.

  As described above, according to the IP telephone system according to the present invention, when there is a terminal whose voice quality has fallen below a predetermined threshold for some reason at the time of connection for incoming representative number, the terminal receives the incoming call. Incoming calls can be connected to a terminal with good voice quality without connecting, and the inconvenience that the voice is interrupted can be avoided.

It is a block diagram which shows the structure of the representative number incoming call | requirement function IP telephone system concerning Example 1 of this invention. It is a figure which shows an example of the data structure of the receiving terminal at the time of the representative number incoming call memorize | stored in a receiving order memory | storage part. It is a flowchart which shows the procedure in which a voice quality monitoring part monitors voice quality based on the voice quality detection data received from each terminal. It is a flowchart which shows an example of the procedure of the connection control at the time of the representative number arrival in a call control server. It is a flowchart which shows another example of the procedure of the connection control at the time of the representative number arrival in a call control server. It is a block diagram which shows the structure of the representative number incoming call | requirement function IP telephone system concerning Example 2 of this invention. It is a figure which shows an example of the data memorize | stored in a caller number registration 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 402... Voice quality monitoring unit 403... Representative number incoming call control unit 404.
501 ... Control circuit 502 ... Handset 503 ... Display unit 504 ... Input unit 505 ... Notification means 506 ... Audio quality detection unit 507 ... Memory

Claims (10)

An incoming order storage unit that sets an incoming order to search for an empty IP telephone among a plurality of predetermined IP telephones, and an IP telephone is searched in the order of incoming calls set in the incoming order storage part, and a representative number is received by an empty IP telephone. In an IP telephone system having a representative number incoming call function with a representative number incoming call control unit for connecting
The IP telephone system includes a voice quality monitoring unit that monitors voice quality of each IP telephone,
The plurality of IP telephones includes a voice quality detection unit that calculates a value of a predetermined parameter indicating voice quality set in advance at the end of a call,
The voice quality monitoring unit changes the incoming call order set in the incoming call order storage unit for an IP telephone whose parameter value detected by the voice quality detection unit is lower than a predetermined threshold, and the representative number incoming call control unit is An IP telephone system having a representative number connection unit function of searching for a vacant IP telephone among a plurality of IP telephones in accordance with the changed incoming order and connecting an incoming representative number. The incoming order stored in the incoming order storage unit is a priority indicating a priority order for searching for an empty IP phone,
The voice quality monitoring unit changes the incoming call order set in the incoming call order storage unit for an IP telephone whose parameter value detected by the voice quality detection unit is lower than a predetermined threshold, and the representative number incoming call control unit is 2. The IP telephone system having a representative number connection unit function according to claim 1, wherein an empty IP telephone is searched from a plurality of IP telephones according to the changed incoming order, and a representative number incoming call is connected. The incoming order stored in the incoming order storage unit is an order that is sequentially shifted every time there is a representative number incoming call, and is an order that indicates a selection order for searching for an empty IP phone,
The voice quality monitoring unit changes the incoming call order set in the incoming call order storage unit for an IP telephone whose parameter value detected by the voice quality detection unit is lower than a predetermined threshold, and the representative number incoming call control unit is 2. The IP telephone system having a representative number connection unit function according to claim 1, wherein an empty IP telephone is searched from a plurality of IP telephones according to the changed incoming order, and a representative number incoming call is connected. The IP telephone system further includes a caller detection unit having a caller number registration unit that registers a desired caller telephone number,
When the caller detection unit detects an incoming representative number from the caller telephone number registered in the caller number registration unit, the voice quality monitoring unit sets the parameters detected by the voice quality detection unit. The incoming call order set in the incoming call order storage unit is changed for an IP telephone whose value has fallen below a predetermined threshold value, and the representative number incoming call control part is configured to use a free IP address among a plurality of IP telephones according to the changed incoming call order. The IP telephone system having a representative number connection unit function according to any one of claims 1 to 3, wherein a telephone is searched and a representative number incoming call is connected. A call control server in an IP telephone system for controlling an IP telephone including a voice quality detection unit that calculates a value of a predetermined parameter indicating voice quality set in advance at the end of a call,
The call control server includes an incoming order storage unit that sets an incoming order for searching for an empty IP telephone among a plurality of predetermined IP telephones, and searches for IP telephones in the order of incoming calls set in the incoming order storage part. A representative number incoming call control unit for connecting the incoming representative number to the IP phone, and a voice quality monitoring unit for monitoring the voice quality of each IP phone,
The voice quality monitoring unit changes the incoming call order set in the incoming call order storage unit for an IP telephone whose parameter value detected by the voice quality detection unit is lower than a predetermined threshold, and the representative number incoming call control unit is A call control server that searches for a free IP telephone among a plurality of IP telephones in accordance with the changed incoming order and connects an incoming representative number. The incoming order stored in the incoming order storage unit is a priority indicating a priority order for searching for an empty IP phone,
The voice quality monitoring unit changes the incoming call order set in the incoming call order storage unit for an IP telephone whose parameter value detected by the voice quality detection unit is lower than a predetermined threshold, and the representative number incoming call control unit is 6. The call control server according to claim 5, wherein a search is made for an empty IP telephone among a plurality of IP telephones according to the changed incoming order, and a representative number incoming call is connected. The incoming order stored in the incoming order storage unit is an order that is sequentially shifted every time there is a representative number incoming call, and is an order that indicates a selection order for searching for an empty IP phone,
The voice quality monitoring unit changes the incoming call order set in the incoming call order storage unit for an IP telephone whose parameter value detected by the voice quality detection unit is lower than a predetermined threshold, and the representative number incoming call control unit is 6. The call control server according to claim 5, wherein a search is made for an empty IP telephone among a plurality of IP telephones according to the changed incoming order, and a representative number incoming call is connected. The call control server further includes a caller detection unit having a caller number registration unit that registers a desired caller telephone number,
When the caller detection unit detects an incoming representative number from the caller telephone number registered in the caller number registration unit, the voice quality monitoring unit sets the parameters detected by the voice quality detection unit. The incoming call order set in the incoming call order storage unit is changed for an IP telephone whose value has fallen below a predetermined threshold value, and the representative number incoming call control part is configured to use a free IP address among a plurality of IP telephones according to the changed incoming call order. The call control server according to any one of claims 5 to 7, wherein a telephone is searched and a representative number incoming call is connected. An incoming order storage unit that sets an incoming order to search for an empty IP telephone among a plurality of predetermined IP telephones, and an IP telephone is searched in the order of incoming calls set in the incoming order storage part, and a representative number is received by an empty IP telephone. And a voice quality monitoring unit that monitors the voice quality of each IP phone, and the voice quality monitoring unit sets the IP phone whose voice quality has deteriorated in the incoming order storage unit. And the representative number incoming call control unit searches for an empty IP telephone among a plurality of IP telephones according to the changed incoming order, and connects the incoming representative number. An IP phone connected to a server,
The IP telephone includes a voice quality detection unit that calculates a value of a predetermined parameter indicating a voice quality set in advance at the end of the call to the plurality of IP telephones, and the IP telephone of the predetermined parameter detected by the voice quality detection unit An IP telephone, wherein a value is transmitted to the voice quality monitoring unit. An incoming order storage unit that sets an incoming order to search for an empty IP telephone among a plurality of predetermined IP telephones, and an IP telephone is searched in the order of incoming calls set in the incoming order storage part, and a representative number is received by an empty IP telephone. And a voice quality monitoring unit that monitors the voice quality of each IP phone, and the voice quality monitoring unit sets the IP phone whose voice quality has deteriorated in the incoming order storage unit. And the representative number incoming call control unit searches for an empty IP telephone among a plurality of IP telephones according to the changed incoming order, and connects the incoming representative number. An IP phone connected to a server,
The IP telephone includes a voice quality detection unit that calculates a value of a predetermined parameter indicating a voice quality set in advance at the end of the call to the plurality of IP telephones, and the IP telephone of the predetermined parameter detected by the voice quality detection unit An IP telephone, characterized in that, when a value falls below a predetermined threshold, a message indicating that voice quality has been lowered is transmitted to the voice quality monitoring unit.

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