JPH11196134A - Communication quality information management device and relay device - Google Patents

Abstract

(57) [Summary] [Problem] To provide a communication quality information management device that dynamically searches for a network address of a voice relay device of a connection destination that can secure a predetermined communication quality and responds to a network address inquiry request. I do. SOLUTION: Each of the voice relay devices detects communication quality information between the voice relay devices 103 and transmits the same to a communication quality information management device 104. The communication quality information management device 104 stores the communication quality information in a table. In response to the network address inquiry request of the voice relay device, the communication quality information management device 104 refers to the table, searches for the network address of the connection destination voice relay device capable of ensuring the specified communication quality, and replies.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a voice communication between a voice terminal connected to a telephone network and a communication terminal connected to a data communication network, and to a voice terminal connected to a telephone network via a voice relay device. The present invention relates to a device for managing a network address of a voice relay device capable of performing data communication according to a specified communication quality in voice communication between two voice terminals.

[0002]

2. Description of the Related Art As a means for managing a network address in a conventional data communication network, for example, RFC 103
4, RFC 1035 (cf.ftp: //ftp.I)
internet. net / rfc /)
In Name System (hereinafter, DNS) has been proposed and widely used in the current Internet. In the DNS, a set of a host name and a network address is registered as a table in advance, and a search is made from a table registered in advance in response to a network address inquiry request, and the result is returned.

[0003]

A voice communication function between a communication terminal connected to a telephone network and a communication terminal connected to a data communication network, and connection to a telephone network via two voice relay devices. In the communication system providing the function of voice communication between the two communication terminals, the following problems are encountered in applying the above technology to the management of the network address of the voice relay device.

[0004] The first is a QOS (Quality of Service) represented by the current Internet as a data communication network.
Service) When using a non-guaranteed network, the communication quality between any two voice relay devices varies over time and is not constant. Therefore, when the DNS is used, the network address of the same voice relay device is always searched for the same search condition without considering the communication quality between the voice relay devices. Even if there is another relay device, the network address of the voice relay device is not searched, and there is a problem that communication quality cannot be secured or a communication path cannot be controlled.

[0005] The second problem is that if there is no route on the data communication network to the voice relay device, or if the network address of the voice relay device that is not operating is searched, the voice relay process cannot be executed. There is.

A first object of the present invention is to manage communication quality information for dynamically searching for a network address of a voice relay device of a connection destination capable of ensuring a predetermined communication quality and responding to a network address inquiry request. It is to provide a device.

A second object of the present invention is to provide a management apparatus for detecting a voice relay apparatus in an unreachable state due to a loss of a path or the like and not responding to the network address of the voice relay apparatus.

[0008]

In order to solve the above problems, the present invention comprises a plurality of relay devices for relaying communication between a communication network whose communication quality is not guaranteed and a communication network whose communication quality is guaranteed. In the communication system, the relay device obtains communication quality information corresponding to communication quality with another relay device, and is a communication quality information management device that manages the communication quality information, wherein the relay device is transmitted from the relay device. Management means for receiving the communication quality information, storing the communication quality information in association with the sending relay device and the identification information of the connected relay device, and sending the communication quality information from the relay device;
A receiving unit that receives an inquiry request for a relay device that satisfies a predetermined communication quality as a connection destination, and when receiving the inquiry request by the receiving unit, refers to communication quality information managed by the managing unit, Request processing means for extracting a connection destination relay device corresponding to the communication quality information satisfying the predetermined communication quality, and transmission means for transmitting identification information corresponding to the extracted connection destination relay device to the relay device that has queried the identification information; Is provided. Thus, a relay device that can perform communication satisfying a predetermined communication quality can be set as a connection destination.

[0009] The management means may further store information corresponding to a reception time of the communication quality information sent from the relay device in association with the communication quality information, and may store a predetermined time from the reception time. After the elapse, the communication quality information can be deleted. If the relay device transmits the communication quality information periodically, after receiving the communication quality information after the elapse of a predetermined time, if the relay device does not receive the communication quality information, it is considered that some failure has occurred in the relay device. Therefore, by deleting the communication quality information, such a relay device can be prevented from being a connection destination.

[0010] More specifically, the management means further stores a country code and / or an area code of a telephone number of the relay device in association with the relay device of the connection destination. In response to the inquiry request of the connection destination relay apparatus, a predetermined digit of the country code and / or area code of the telephone number included in the request is stored in the country code and / or area code stored in the management unit. A connection destination relay device that matches the digit of the station number may be detected, and a connection destination relay device that satisfies the predetermined communication quality may be extracted from the connection destination relay devices. Also,
The management means further stores a country code and / or an area code of a telephone number of the relay device in association with the connection destination relay device, and further stores a country code and / or an area code of the telephone number.
Or the corresponding country code and / or
Or, further storing the area code, the request processing means,
In response to the inquiry request of the connection destination relay device, the connection destination relay device corresponding to the country code and / or area code of the telephone number included in the request and / or the adjacent country code and / or area code are included. A corresponding connection destination relay device may be detected, and a connection destination relay device that satisfies the predetermined communication quality may be extracted from the connection destination relay devices.

[0011] The communication quality information may indicate a communication speed and / or a packet loss rate between the relay devices.

Further, in a relay device for relaying communication between a communication network whose communication quality is not guaranteed and a communication network whose communication quality is guaranteed, a communication device for communicating with another relay device at predetermined time intervals. A detecting unit for detecting the quality information; and a storage unit for storing the communication quality information detected by the detecting unit.

[0013] The information processing apparatus further includes a transmission unit that transmits the communication quality information stored in the storage unit to a predetermined device that should manage the communication quality information. When there is a call request from the terminal, the relay device of the connection destination can be queried to the management device together with communication quality information corresponding to a predetermined allowable value of communication quality.

[0014] Further, as a hardware configuration, in a communication system including a plurality of relay devices for mutually converting analog voice signals and digital voice data, a communication quality corresponding to a communication quality with another relay device is provided. A communication quality information management device for acquiring information and managing the communication quality information, comprising: an interface for connecting to the relay device; a memory for storing data and a program; and a CPU for executing the program. The interface receives the communication quality information transmitted from the relay device, and receives an inquiry request for a relay device that satisfies a predetermined communication quality as a connection destination, and the memory includes the interface The communication quality information received in step 2 is written in correspondence with the identification information of the transmitting relay device and the connected relay device. And a program that, when receiving the inquiry request at the interface, implements a process of extracting a connection destination relay device corresponding to communication quality information satisfying the predetermined communication quality, and stores the program. Then, the identification information corresponding to the extracted connection destination relay device is transmitted to the inquired relay device.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows a configuration diagram of a communication system according to an embodiment of the present invention. 101 is a telephone network, 102 is a data communication network, and a voice relay device 103 relays voice between the telephone network 101 and the data communication network 102. The communication quality information management device 104 manages communication quality information between the voice relay devices 103, and returns a network address of the voice relay device to a network address inquiry request. The communication terminal 105 is a terminal that can perform voice communication. The terminal 105 receives digital voice data from a data communication network, decodes the data, and outputs the analog voice signal from a voice output device such as a speaker, and a voice input device such as a microphone. It has a function of encoding an analog audio signal input from the device and transmitting it as digital audio data to a data communication network. The telephone terminals 110 and 111 are voice terminals connected to the telephone network 101.

In the present embodiment, each voice relay device detects communication quality information between voice relay devices, and transmits the detected communication quality information to communication quality information management device 104. The communication quality information management device 104 stores communication quality information between the voice relay devices in a communication quality information management table, and manages the communication quality information. Further, the communication quality information management device 104 is designated based on the contents of the communication quality information management table in response to a network address inquiry request from the voice relay device at the time of a call request between the telephone terminals 110 and 111. The network address of the connection destination voice relay device capable of ensuring the communication quality is dynamically searched and answered.

Next, the configuration of the voice relay device will be described. FIG. 2 shows a configuration diagram of the voice relay apparatus 103. In FIG. 2, reference numeral 201 denotes a telephone network interface control unit telephone network;
2 is a telephone network interface which is an interface with the telephone network 201; 203 is a telephone network interface control unit which controls the telephone network interface 202; 204 is a data communication network; 205 is a data communication network interface which is an interface with the data communication network 204 And 206, a data communication network interface control unit for controlling the data communication network interface control unit 205. Voice relay processing unit 207
Encodes an analog voice signal input from the telephone network interface 202, and
05, and a function of decoding digital voice data input from the data communication network interface 205 and outputting it to the telephone network interface 202 as analog voice data. The communication quality detection unit 210 periodically detects the communication quality of the line with another voice relay device. The communication quality information transmitting section 211 transmits the communication quality information obtained by the communication quality detecting section 210. The request transmitting unit 212 inquires about the network address of the connection destination voice relay device. The result receiving unit 213 receives the result of the network address inquiry and connects to the connected voice relay device according to the received connected address.

Next, the configuration of the communication quality information management device will be described. FIG. 3 shows a configuration diagram of the communication quality information management device 104. In FIG. 3, reference numeral 301 denotes a data communication network;
Reference numeral 2 denotes a data communication network interface serving as an interface with 301, and 303 denotes a data communication network interface control unit that controls 302. Communication quality information collection unit 304
Is the voice relay device 103 connected to the data communication network 301
, Via the data communication network interface control unit 303, and collects communication quality information by itself. The communication quality information management unit 305 stores and manages the communication quality information collected by the communication quality information collection unit 304 together with the reception time in a communication quality information management table. The communication quality information management table 306 stores communication quality information and reception time. The inquiry request receiving unit 307 receives a network address inquiry request from the voice relay device 103 via the data communication network interface control unit 303. The inquiry request processing unit 308 searches for management information of the communication information management unit 305 in response to the inquiry request received by the inquiry request receiving unit 307. The inquiry request transmission unit 309 transmits the result searched by the inquiry request processing unit 308 to the transmission source of the network address inquiry request. The time-out processing unit 310 performs a time-out process of deleting communication quality information between voice relay devices that have not received communication quality information for a predetermined time according to the management information in the communication quality information management table 306.

FIG. 13 shows a hardware configuration of the communication quality management device. In FIG. 13, in a communication system including a plurality of voice relay devices that mutually convert an analog voice signal and digital voice data, the voice relay device acquires communication quality information corresponding to communication quality with another voice relay device, The communication quality information management device 104 for managing the communication quality information includes an interface 1210 for connecting to the voice relay device, a memory 1230 for storing data and programs, and a CP for executing the programs.
U1220. The interface 1210 receives the communication quality information sent from the voice relay device,
Also, it receives an inquiry request for a voice relay device that satisfies a predetermined communication quality as a connection destination. Memory 1230
Stores the communication quality information received by the interface in association with the identification information of the sending voice relay device and the connection destination voice relay device.
A program for realizing a process of extracting a connection destination voice relay device corresponding to communication quality information satisfying the predetermined communication quality when the inquiry request is received. The interface 1210 transmits identification information corresponding to the extracted connected voice relay device to the voice relay device that inquired. As shown in FIG. 13, the processing in the communication quality management device can be processed by the CPU 1220.

FIG. 4 shows a packet structure of communication quality information received by the communication quality information management device 104 from the voice relay device 103. The voice relay device 103 collects communication quality in a communication path with another voice relay device, converts the result into a communication quality information packet, and communicates the network address of the own device in order to indicate the source voice relay device. It is added to the header of the quality information packet (not shown), and is transmitted to the communication quality information management device 104 periodically. The communication quality information packet 406 includes a network address storage unit 403 that stores the network address of the connection destination voice relay device, which is another voice relay device, a telephone number storage unit 407 that stores the telephone number of another voice relay device, Voice communication packet loss rate storage unit 40 indicating communication quality with voice relay device
4, and a communication quality information block composed of four communication speed storage units 405 for storing communication speeds in communication with another voice relay device, and a total number of communication quality information blocks 402 included in one packet. Number of blocks shown 40
It consists of 1. The communication quality information indicates the packet loss rate in the present embodiment, but may be any information that indicates the communication quality of the line, such as the fluctuation width of the reception interval of voice communication packets.

FIG. 5 shows a packet structure of a network address inquiry request from the voice relay device 103. The network address inquiry request packet 505 stores a connection destination telephone number storage unit 501 for storing a telephone number of a communication terminal of a connection destination, and an allowable value (minimum communication speed) of a communication speed when communicating with the connection destination. Communication speed storage unit 502
And a request packet loss rate storage unit 503 for storing an allowable value of packet loss rate (highest loss rate) which is communication quality when communicating with a connection destination. Voice relay device 103
Determines which voice relay device should be used for communication at the time of a call request from a telephone terminal.
Ask 04. At that time, the voice relay device 103
The communication quality information corresponding to the desired communication speed and communication quality is notified together with the telephone number of the connection destination telephone terminal.
Communication quality information corresponding to a desired communication speed and communication quality may be determined in advance, or may be specified from a telephone terminal. When desired communication quality information is predetermined for the entire network, the communication speed storage unit 502 and the required packet loss rate storage unit 503 need not be transmitted at the time of inquiry.

The communication quality information management device 104 searches the telephone number of the communication terminal of the connection destination for a voice relay device of the communication path of the relay destination that satisfies the desired communication speed and communication quality, and finds the network address of the voice relay device. As a response to the query.

FIG. 6 shows a packet structure of a network address inquiry reply transmitted from the communication quality information management device 104 as a response to the network address inquiry request 603. In FIG. 6, a network address inquiry reply packet 603 includes one or two or more network address storage units 602 each storing a network address corresponding to a voice relay device of a communication path of a relay destination that satisfies a desired communication speed and communication quality. , The number of blocks 601 indicating the total number of network address storage units 602 included in one packet. The network address inquiry response packet 603 may indicate the communication quality for each voice relay device (network address).

FIG. 7 shows a communication quality information management table 306.
The table structure of FIG. In FIG. 7, the communication quality information management table 306 includes a network address 701 of the voice relay device that has transmitted the communication quality information, a network address 702 of the voice relay device to be connected, and the outside and inside of the telephone number of the voice relay device to be connected. Telephone number 703 indicating the area code
A communication speed 704 indicating a communication speed in communication between the source voice relay device and the connection destination voice relay device; and a loss of voice communication packets in communication between the transmission source voice relay device and the connection destination voice relay device. The loss rate 705 indicating the rate and the reception time 706 indicating the time when the communication quality information management device 104 received the communication quality information are stored as one record. The voice relay device corresponds to a local or international telephone number of a telephone number.

Next, processing in the communication quality information management unit 305 of the communication quality information management device 104 will be described. FIG.
9 shows a flowchart of the processing operation of the communication quality information management unit 305.

In FIG. 8, communication quality information management section 305
Receives from the communication quality information collection unit 304 the communication quality information packet 406 shown in FIG. 4 that is periodically transmitted from each voice relay device (step 802), and transmits the received information to the network of the source voice relay device. Fig. 7
Is searched in the communication quality information management table 306 (step 803). In the communication quality information management table 306,
It is determined whether or not the network address of the source voice relay device has not been registered (step 804). If not registered, the communication quality information is sent to the network address of the source voice relay device, the network address of the destination voice relay device, the telephone number of the destination voice relay device, and the communication between the source voice relay device and the destination voice relay device. Speed of voice communication in communication between devices, packet loss rate in communication between a source voice relay device and a connection destination voice relay device, and communication quality at which communication quality information management device 104 received communication quality information The information reception time is newly registered for each connection destination address (step 805). If already registered, the communication speed of the voice communication in the communication between the source voice relay device and the connection destination voice relay device according to the communication quality information of the received communication quality information packet corresponding to the source address. The packet loss rate in the communication between the source voice relay device and the connection destination voice relay device, and the communication quality information reception time at which the communication quality information management device 104 received the communication quality information for each connection destination address. Update (step 80
6).

Next, the processing in the network address inquiry processing unit 308 of the communication quality information management device 104 will be described. FIG. 9 shows a flowchart of the processing operation of the network address inquiry processing unit 308.

In FIG. 9, a network address inquiry processing unit 308 transmits a network address inquiry request packet 505 shown in FIG. 5 transmitted from a communication terminal or a voice relay device during a telephone call to a network address inquiry receiving unit. 307 (step 9
02). Network address inquiry processing unit 308
Is the network address of the voice relay device inquired about the network address as the source address, and the predetermined number of digits from the high-order digits of the local area code of the connection destination telephone number as the telephone number (local area code) 7 are searched from the communication quality information management table 306 shown in FIG. 7 (step 903). It is determined whether or not the retrieved record has a speed higher than the desired communication speed and lower than the required packet loss rate (step 904). If there is a corresponding record, the connection of the corresponding record is determined from the communication quality information management table. Extract all destination addresses (step 90
5) A network address inquiry reply packet is generated based on the connection destination address (step 906), and the network address inquiry reply is transmitted (step 907). If there is no corresponding record, “none” is returned.

In the process shown in FIG. 9, a predetermined number of digits is searched for as a telephone number from the upper digits of the local and international numbers of the connection destination telephone number, but instead of or in accordance with this. And the adjacent area code
The setting may be made as shown in FIG. FIG.
Shows the table structure of the adjacent area code table 120.
Reference numeral 1201 denotes an area code, and 1202 denotes a list of area codes adjacent to the area code. In the adjacent area code table 120 shown in FIG. 12, adjacent area codes are set in advance so as to correspond to the area codes. FIG. 9 described above.
In the search of the management table in step 903 of the processing shown in FIG.
Reference numeral 8 denotes an area code adjacent to the area code shown in FIG. 12 and extracts an adjacent area code from the area code of the connection destination telephone number, and extracts the extracted area code together with the source address. All matching records may be searched from the communication quality information management table 306 shown in FIG.

According to the present embodiment, in response to a network address inquiry request of the data communication network interface from the voice relay device, the network quality is specified in the communication quality information management table based on the communication quality information between the voice relay devices. The network address of the connection destination voice relay device that satisfies the communication quality is returned, and communication with the specified communication quality can be secured. Further, instead of the communication quality between the voice relay devices, the communication quality of the communication line between the communication terminals may be managed. In this case, the communication terminal can transmit the network address inquiry request.

Further, by incorporating the communication quality management device and the voice relay device in the same housing, it becomes possible to implement a voice relay and communication quality information management device.

The communication quality information is periodically transmitted from the voice relay device. If the communication quality information is not updated after a certain period of time, it is determined that some trouble has occurred in the voice relay device. For this reason, the communication quality information stored in the communication quality information management table may be deleted. The processing in this case will be described with reference to FIG. FIG. 10 shows a processing flowchart of the time-out processing unit 310.

In FIG. 10, the timeout processing unit 103
Searches for the communication quality information reception time in the communication quality information management table that has not been updated for a predetermined period (step 1002), and determines whether there is a corresponding record (step 1003). If there is a corresponding record, it is determined that the voice relay device is in the connection disabled state, and the corresponding record is deleted from the communication quality information management table (step 1004).

The sequence between the respective devices together with the time-out process will be described with reference to FIG. FIG. 11 shows a processing sequence related to communication quality information management in the communication system 106.

In FIG. 11, the voice relay apparatus 103 inquires the communication quality information management apparatus 104 of the network address, and the voice relay apparatuses 1 and 2 transmit the communication quality information to the communication quality information management apparatus 104. Is shown. FIG. 11 illustrates an example in which the voice relay device 2 stops transmitting communication quality information.

In FIG. 11, the voice relay apparatus 103 requests a network address inquiry request (1108) to the communication quality management information 104, and obtains a network address inquiry reply (1109). In addition, all voice relay devices periodically collect communication quality information with other voice relay devices, and obtain communication quality information 1105, 1106,
And 1107 are transmitted. When the operation of the voice relay device 2 is stopped, the communication quality information management device 104 cannot receive the communication quality information from the voice relay device 2, and determines that the time has expired (1112) after a certain period has elapsed. .

According to the present embodiment, it is possible to detect a state in which connection to the voice relay device is disabled due to a route loss or the like. It is possible to reduce the possibility of replying the network address of the voice relay device in the state.

[0039]

According to the present invention, in a communication system for providing a voice communication function between two voice terminals connected to a telephone network via a voice relay device, a connection destination voice from the voice relay device is provided. It is possible to reply to the network address inquiry request of the relay device, the network address of the connection destination voice relay device capable of ensuring the specified communication quality.

Further, according to the present invention, it is possible to detect an unreachable state to the voice relay device due to a route loss, etc., and it is possible to reduce the possibility of replying the network address of the voice relay device in the unreachable state. Becomes

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a communication system.

FIG. 2 is a configuration diagram of a voice relay device.

FIG. 3 is a configuration diagram of a communication quality information management device.

FIG. 4 is an explanatory diagram of a communication quality information packet structure.

FIG. 5 is an explanatory diagram of a network address inquiry request packet structure.

FIG. 6 is an explanatory diagram of a network address inquiry reply packet structure.

FIG. 7 is an explanatory diagram of a communication quality information management table structure.

FIG. 8 is a flowchart of a processing operation of a communication quality information management unit.

FIG. 9 is a flowchart of a processing operation of a network address inquiry processing unit.

FIG. 10 is a flowchart of a processing operation of a time-out processing unit.

FIG. 11 is a processing sequence diagram regarding communication quality information management in the communication system.

FIG. 12 is an explanatory diagram of an adjacent area code table structure.

FIG. 13 is a hardware configuration diagram of the communication quality information management device.

[Explanation of symbols]

101: telephone network, 102: data communication network, 103: voice relay device, 104: communication quality information management device, 105: communication terminal, 110: telephone terminal.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshimitsu Hayashi 810 Shimo-Imaizumi, Ebina-shi, Kanagawa Prefecture Hitachi Office Ltd. Office Systems Division

Claims (9)

[Claims] In a communication system having a plurality of relay devices for relaying communication between a communication network whose communication quality is not guaranteed and a communication network whose communication quality is guaranteed, the relay device communicates with another relay device. A communication quality information management device that acquires communication quality information corresponding to quality, manages the communication quality information, receives the communication quality information transmitted from the relay device, and transmits the communication quality information. Management means for storing the identification information of the relay device and the connection destination relay device in association with the identification information; and reception means for receiving an inquiry request for a relay device that satisfies a predetermined communication quality as a connection destination, transmitted from the relay device And when the receiving unit receives the inquiry request, refers to communication quality information managed by the management unit, and performs communication that satisfies the predetermined communication quality. Communication quality information, comprising: request processing means for extracting a connection destination relay device corresponding to the quality information; and transmission means for transmitting identification information corresponding to the extracted connection destination relay device to the inquired relay device. Management device. 2. The communication quality information management device according to claim 1, wherein the management unit associates information corresponding to a reception time of the communication quality information transmitted from the relay device with the communication quality information. A communication quality information management device, wherein the communication quality information is deleted after a predetermined time elapses from the reception time. 3. The communication quality information management device according to claim 1, wherein said management means further associates a country code and / or area code of a telephone number of said relay device with said relay device corresponding to said relay device. The request processing means stores, in response to the inquiry request of the connection destination relay device, a predetermined digit of a country code and / or an area code included in the request to the management means. A connection destination relay device that matches the digit of the stored country code and / or area code is detected, and a connection destination relay device that satisfies the predetermined communication quality is extracted from the connection destination relay devices. Characteristic communication quality information management device. 4. The communication quality information management device according to claim 1, wherein said management means further associates a country code and / or area code of a telephone number of said relay device with said relay device corresponding to said relay device. And further storing an adjacent country code and / or area code in association with the country code and / or area code of the telephone number. In response to the matching request, the connection destination relay device corresponding to the country code and / or area code of the telephone number included in the request and / or the connection destination relay device corresponding to the adjacent country code and / or area code are included. A communication quality information management device that detects and extracts a connection destination relay device satisfying the predetermined communication quality from the connection destination relay devices. 5. The communication quality information management device according to claim 1, wherein the communication quality information indicates a communication speed between respective relay devices and / or a packet loss rate. 6. A relay device for relaying communication between a communication network whose communication quality is not guaranteed and a communication network whose communication quality is guaranteed, wherein the communication device performs communication with another relay device at predetermined time intervals. A relay device comprising: a detection unit that detects quality information; and a storage unit that stores communication quality information detected by the detection unit. 7. The relay device according to claim 6, further comprising a transmitting unit that transmits the communication quality information stored in the storage unit to a predetermined device that should manage the communication quality information. Characteristic relay device. 8. The relay device according to claim 7, wherein when a call is requested from a terminal, the relay device of the connection destination is transmitted to the management device together with communication quality information corresponding to a predetermined allowable value of communication quality. A relay device characterized by inquiring about. 9. In a communication system including a plurality of relay devices for mutually converting an analog voice signal and digital voice data, the relay device acquires communication quality information corresponding to communication quality with another relay device, and A communication quality information management device for managing communication quality information, comprising: an interface for connecting to the relay device; a memory for storing data and a program; and a C for executing the program.
A PU, wherein the interface receives the communication quality information sent from the relay device, and receives an inquiry request for a relay device that satisfies a predetermined communication quality as a connection destination; and Storing the communication quality information received by the interface in association with the identification information of the relay device and the relay device to which the relay device is connected, and when the inquiry request is received by the interface, A program that implements a process of extracting a connection destination relay device corresponding to communication quality information that satisfies the above condition, and the interface transmits the identification information corresponding to the extracted connection destination relay device to the relay device that inquired. Communication quality information management device characterized by the above-mentioned.