JP4020819B2 - VoIP telephone system and communication control method in VoIP telephone system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a VoIP (Voice over Internet Protocol) telephone system and a communication control method in the VoIP telephone system.
[0002]
[Prior art]
There has been provided an IP phone that performs a telephone exchange service by performing relay exchange using VoIP, which is a technology for transmitting a voice signal using an IP (Internet Protocol) network such as the Internet or an intranet.
[0003]
In this IP phone, the calling side and the receiving side use the IP address assigned to each to transmit the telephone voice by IP packet, thereby enabling a call, and the call can be made with a low call charge. Has become possible, so the spread has expanded.
[0004]
As described in, for example, Patent Document 1 (Japanese Patent Laid-Open No. 2000-32057) and Patent Document 2 (Japanese Patent Laid-Open No. 2001-285358), this IP phone is similar to a conventional phone. It has been proposed that an IP telephone be provided with a function of transferring to a preset transfer destination when an incoming call is received during a call.
[0005]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-32057.
[Patent Document 2]
JP 2001-285358 A.
[0006]
[Problems to be solved by the invention]
By the way, in the telephone communication using the above-described IP telephone service, for example, a VoIP telephone system that can provide a service similar to a button telephone system for enterprises is considered. FIG. 24 is a diagram for explaining the outline of a communication network using this VoIP telephone system.
[0007]
In FIG. 24, reference numerals 1A and 1B respectively denote VoIP telephone systems, and each form one LAN (Local Area Network). The VoIP telephone systems 1A and 1B are connected through an IP network 2 such as the Internet. In this case, for example, the VoIP telephone system 1A can be a system for the Tokyo head office, and the VoIP telephone system 1B can be a system for the Osaka branch office.
[0008]
Each of the VoIP telephone systems 1A and 1B includes a main apparatus 12A and 12B and a plurality of VoIP telephone terminals (hereinafter, for the sake of simplicity) with respect to each of the LAN 11A and LAN 11B configured by a cable or wireless connection method. , 13An and a plurality of telephone terminals 13B1, 13B2,..., 13Bm and routers 14A and 14B are connected to each other.
[0009]
The router 14A and the router 14B are used when one VoIP telephone system and another VoIP telephone system are connected through the IP network 2.
[0010]
In this example, for example, system numbers in the IP network 2 are assigned to the VoIP telephone systems 1A and 1B, and telephone terminals 13A1 to 13n and 13B1 in the VoIP telephone systems 1A and 1B, respectively. Terminal numbers (for example, extension numbers) are assigned in advance to .about.13Bm, and the main devices 12A and 12B store call control addresses for other VoIP telephone systems corresponding to the system numbers. In addition, the call control address of the telephone terminal in each of the VoIP telephone systems 1A and 1B is stored in correspondence with the terminal number (extension number).
[0011]
As will be described later, a message for call control, in this example, a SIP (Session Initiation Protocol) standard message is exchanged between the telephone terminals in each of the VoIP telephone systems 1A and 1B via the main unit. As a result, a voice communication path can be formed between telephone terminals in each VoIP telephone system.
[0012]
When communicating with a telephone terminal in another VoIP telephone system beyond the router, call control messages are also exchanged between the main units via the router, and voice is transmitted via the router. A communication path can be formed.
[0013]
FIG. 25 and FIG. 26 are a route explanatory diagram and a sequence diagram for explaining processing from outgoing call to telephone call between telephone terminals in one VoIP telephone system. The example of FIGS. 25 and 26 is a case where a certain telephone terminal X in the VoIP telephone system 1A makes a call to another certain telephone terminal Y. In FIG. 25 and FIG. 26, the double solid line arrows indicate the transmission of voice data, and the other single line solid arrows indicate the transmission of SIP standard call control messages.
[0014]
As shown in the sequence diagram of FIG. 26, when a telephone terminal X (hereinafter referred to as “transmission terminal X”) serving as a transmission terminal performs a transmission (transmission) in which the telephone terminal Y is designated as a reception terminal (hereinafter referred to as a reception terminal Y). The outgoing message is received by main apparatus 12A. The outgoing message includes a media standby IP address and port number of the transmission terminal X (information on the media standby IP address and port number is media standby address information) and a media type (in this case, voice data). This is information indicating that there is the same. These data are assumed to conform to SDP (Session Description Protocol). The same applies hereinafter.
[0015]
When the main device 12A receives this outgoing message, it transfers this outgoing message to the receiving terminal Y. If the receiving terminal Y is not in use, the receiving terminal Y returns a call request acceptance message to the main apparatus 12A. The receiving terminal Y recognizes the media standby IP address, port number, and media type of the transmitting terminal X from the information included in the outgoing message. Then, the receiving terminal Y returns a response message including its own media standby IP address, port number, and media type information to the main apparatus 12A.
[0016]
When the main device 12A receives this response, the main device 12A transfers a response message including the media standby IP address of the receiving terminal Y, the port number, and the media type information to the transmitting terminal X. By receiving this response message, the calling terminal X recognizes the media standby IP address, port number, and media type of the receiving terminal Y.
[0017]
As described above, the transmitting terminal X and the receiving terminal Y recognize the other party's media standby IP address and port number, respectively. Therefore, after that, the sending terminal X and the receiving terminal Y exchange voice data packets specifying the sending party directly through the LAN 11A based on the recognized other party's media standby IP address and port number. Calls can be made.
[0018]
Further, calls between telephone terminals included in different VoIP telephone systems are performed in substantially the same manner through a router. FIG. 27 is a route explanatory diagram for explaining the processing from outgoing call to call in that case. In the example of FIG. 27, a certain telephone terminal X of the VoIP telephone system 1A is a calling terminal, and a certain telephone terminal Z of the VoIP telephone system 1B is a receiving terminal.
[0019]
Similarly to FIGS. 25 and 26, in FIG. 27, the double line solid arrows indicate the transmission of voice data, and the other single line solid arrows indicate SIP (Session Initiation Protocol) standard messages. ing.
[0020]
In this case, the outgoing message designating the incoming terminal Z from the outgoing terminal X is sent to the incoming terminal Z via the main device 12A-router 14A-router 14B-main device 12B, and the media terminal of the outgoing terminal X is waiting for media. The receiving terminal Z recognizes the IP address, port number, and media type information.
[0021]
The response message from the receiving terminal Z is sent to the calling terminal X via the main device 12B-router 14B-router 14A-main device 12A, and the media standby IP address, port number, and media type of the receiving terminal Z are sent. Is recognized by the calling terminal X.
[0022]
As described above, the transmitting terminal X and the receiving terminal Y or the receiving terminal Z recognize the other party's media standby IP address and port number, respectively, and based on the recognized other party's media standby IP address and port number. Voice communication can be performed by specifying a transmission partner and exchanging voice data packets through the routers 14A and 14B.
[0023]
By the way, this type of VoIP telephone system realizes a function that can temporarily hold a busy call and then transfer the call to another telephone terminal or a general voice call that is often used as a business button telephone function. It is important in terms of usability to provide additional functions such as a function to perform.
[0024]
In the case of the conventional key telephone system, the main device was configured to analyze the control message and control the switching of the communication path, so the function of holding the busy call and transferring it to another telephone terminal is as follows: This was achieved by centralized management of the main unit. However, in the case of the VoIP telephone system, the communication path is not under the control of the main apparatus, and is included in the packet header as destination address information (transmission address information) as shown in FIGS. 25 and 27. Packets are transmitted and received between telephone terminals by IP address and port number.
[0025]
Therefore, it is possible to provide a hold and transfer function in the telephone terminal itself, and to notify the media standby IP address and port number held on the telephone terminal, and the media standby IP address and port number of the transfer destination. Then, the hold and transfer functions can be realized even in the VoIP telephone system. In this case, both the sending terminal and the receiving terminal need to have hold and transfer functions.
[0026]
However, providing hold and transfer functions for all VoIP telephone terminals is not preferable because the VoIP telephone terminals are expensive. In addition, when the telephone terminal of the other party of the call does not have a hold / transfer function, the hold / transfer cannot be performed at all, and there is a problem that the usability becomes very bad.
[0027]
In addition, the VoIP telephone system is not configured to analyze the control message and switch the communication path, unlike the main device of the conventional key telephone system, and thus realizes a simultaneous voice call often used as a business button telephone function. In this case, the VoIP telephone terminal itself needs to have the function, or the caller needs to send it to all the telephone terminals subject to simultaneous voice calling.
[0028]
In view of the above points, an object of the present invention is to provide a VoIP system capable of avoiding the above-described problems without providing a hold / transfer function and a simultaneous voice call function in a VoIP telephone terminal.
[0029]
[Means for Solving the Problems]
  In order to solve the above problem, a VoIP telephone system according to the invention of claim 1
  BA plurality of VoIP telephone terminals connected to the local area network;
  Main device means connected to the local area network, for sending and receiving control messages related to calls, and for controlling communications;
  Voice data transmission path control means connected to the local area network to form a voice data transmission path between the VoIP telephone terminal and a partner terminal;
  WithA VoIP telephone system,
  The main device means includes
  Means for transmitting address information for transmission and reception of the voice data on the caller side and the callee side to the voice data transmission path control means;
  With the callerSaidThe voice data transmission path control means with respect to the receiving sideBetweenOf the voice data inSending and receivingA means of conveying address information for
  With
  The voice data transmission path control means is
  Address information for transmission / reception of the voice data between the voice data transmission path control means and the caller side and the callee side, which the main unit means conveys to the caller side and the callee side, The means to tell
  Means for receiving address information for transmission / reception of the voice data between the voice data transmission path control means and the calling side and the called side from the main unit means;
  Music on hold generation means;
  With
  Said caller andSaidThe called partyThe address information received from the voice data transmission path control means via the main device means,As address information of the other party of the voice data transmissionUseThe voice data is transmitted between the calling side and the called side via the voice data transmission path control means.With
  The main device means includes
  Means for sending a connection change request based on the hold request to the voice data transmission path control means when a hold request is received from one of the terminals during a call between the caller and the callee; Prepared,
  The voice data transmission path control means is
  Means for holding a voice data transmission path between the counterpart terminal of the terminal that made the hold request and the voice data transmission path control means when receiving a connection change request based on the hold request;
  Means for sending a hold sound from the hold sound generating means to the counterpart terminal of the terminal that has requested the hold during the hold;
  It is characterized by providing.
[0031]
[Action]
According to the first aspect of the present invention, the audio data transmission path control means is provided separately from the main apparatus means. In the first aspect of the invention, the main device means notifies the voice data transmission path control means of the address information for transmission / reception of the voice data between the caller side and the callee side. Address information for transmission / reception of audio data in the audio data transmission path control means is transmitted to the receiving side and the receiving side.
[0032]
The sending side and the receiving side use the address information for voice data transmission / reception in the voice data transmission path control means as the address information of the other party of the voice data transmission. Voice data is exchanged via In other words, the voice data is transmitted via the voice data transmission path control means, instead of being transmitted by directly instructing the calling side and the called side as counterparts.
[0033]
Therefore, a hold transfer function can be realized by sending a hold instruction to the voice data transmission path control means through the main unit and transmitting address information about the transfer destination.
[0035]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the VoIP system according to the present invention will be described with reference to the drawings.
[0036]
FIG. 1 is a diagram for explaining the outline of a communication network using an embodiment of a VoIP telephone system according to the present invention. The embodiment of FIG. 1 is a case where the present invention is applied to the configuration of FIG. 24 described above. As shown in FIG. 1, in this embodiment, in terms of hardware, the VoIP telephone systems 1A and 1B have media as voice data transmission path control means for the LANs 11A and 11B in addition to the configuration of FIG. The switches 15A and 15B are connected.
[0037]
In this embodiment, the control message is exchanged as a local message by a unicast packet between the main apparatuses 12A and 12B and the media switches 15A and 15B. As a result, the main devices 12A and 12B send media waiting address information (IP address and port number) as address information for sending and receiving the voice data on the caller side and the callee side to the media switches 15A and 15B. In addition, the main devices 12A and 12B transmit media standby address information (IP address and port number) as address information for transmission of audio data in the media switches 15A and 15B from the media switches 15A and 15B. ).
[0038]
Then, the main devices 12A and 12B transmit the acquired address information for transmitting voice data in the media switches 15A and 15B to the caller telephone terminal and the callee telephone terminal. In this example, the exchange of control messages between the main apparatuses 12A and 12B and the telephone terminal is performed as SIP standard messages as described above.
[0039]
[Hardware configuration example of VoIP telephone terminal]
The VoIP telephone terminals 13A1 to 13An and 13B1 to 13Bm in the VoIP telephone system of this embodiment have the same hardware configuration. FIG. 2 shows a representative hardware configuration example of the VoIP telephone terminal 13A1. As shown in FIG. 2, the VoIP telephone terminal of this embodiment includes a terminal main body 100 and a handset HS. Although not shown, the handset HS includes a microphone that constitutes a transmitter, a transmission amplifier, a speaker that constitutes a receiver, and a reception amplifier.
[0040]
The terminal main body 100 is configured by a computer. A CPU (Central Processing Unit) 110 is connected to a ROM (Read Only Memory) 112, a RAM (Random Access Memory) 113, a display controller via a system bus 111. 114, an operation input interface (the interface is described as I / F in the figure, the same applies hereinafter) 116, a LAN interface 118, a packet disassembly / generation unit 119, and an audio data input / output interface 120 are connected.
[0041]
A display 115 is connected to the display controller 114, and a display according to the control of the CPU 110 is performed on the display screen of the display 115.
[0042]
The operation input interface 116 is connected to an operation input unit 117 including numeric keys, cursor keys, and other operation keys. The CPU 110 recognizes which input key has been operated by the user through the operation input unit 117 via the operation input interface 116, and executes processing corresponding to the key input operation according to the program of the ROM 112 based on the recognition result. To do.
[0043]
The ROM 112 stores a program for executing a processing sequence at the time of outgoing or incoming call as a VoIP telephone terminal, a program for receiving a hold or transfer request input, and executing a process at the time of hold or transfer. .
[0044]
The RAM 113 is mainly used as a work area when the program of the ROM 112 is executed by the CPU 110.
[0045]
The LAN interface 118 has a function for capturing packetized data sent through the LAN 11A constituting the IP network and sending the packetized data to the LAN 11A.
[0046]
The packet decomposing / generating unit 119 generates a packetized data to be transmitted by packetizing the control data and voice data to be transmitted, and a function to obtain the control data and voice data by decomposing the packetized data captured by the LAN interface 118 It has the function to do. The packet decomposition / generation unit 119 includes a buffer memory for decomposing and generating packetized data.
[0047]
Note that the packet decomposition processing function and the generation processing function of the packet decomposition / generation unit 119 can be realized as software by the CPU 110 and the ROM 112.
[0048]
The audio data input / output interface 120 converts the audio data obtained by the packet decomposition into an analog audio signal and supplies it to the handset HS, and converts the analog audio signal input from the handset HS into a digital signal and takes it in. It has a function.
[0049]
[Example of main unit hardware configuration]
Next, a hardware configuration example of the main devices 12A and 12B in the system of this embodiment will be described. Since the main devices 12A and 12B have exactly the same configuration, FIG. 3 shows the configuration of the main device 12A as a representative.
[0050]
The main apparatus of this embodiment is constituted by, for example, a personal computer. As shown in FIG. 3, a ROM 212, a RAM 213, a LAN interface 214, and a packet processing unit are connected to a CPU 210 via a system bus 211. 215, a protocol processing unit 216, a service processing unit 217, a media control unit 218, and a management memory unit 219 are connected.
[0051]
The ROM 212 stores a processing program executed by the main apparatus such as a program for executing a processing sequence for control related to a call. The RAM 213 is mainly used as a work area when the program of the ROM 212 is executed by the CPU 210.
[0052]
The LAN interface 214 has a function for capturing packetized data sent through the LAN 11A and sending the packetized data to the LAN 11A.
[0053]
The packet processing unit 215 has a function of decomposing the received packet and packetizing the control data to be transmitted in order to decode the message data for control in the packet taken in by the LAN interface 214. . The packet processing unit 215 includes a buffer memory for temporarily storing packetized data for decomposition / generation and packet transmission / reception processing.
[0054]
The protocol processing unit 216 manages the protocol of packets to be exchanged. The service processing unit 217 is used to perform service processing such as hold, transfer, and simultaneous voice call. The media control unit 218 performs processing for controlling the voice communication path. The protocol processing unit 216, the service processing unit 217, and the media processing unit 218 may be configured as software as programs stored in the ROM 212.
[0055]
The management memory unit 219 includes a system number assigned to the own system, a correspondence relationship between a system number assigned to another VoIP telephone system and an IP address, and a VoIP telephone terminal in each of the VoIP telephone systems 1A and 1B. Are stored in correspondence with the terminal number (extension number).
[0056]
[Example of hardware configuration of media switch]
Next, a hardware configuration example of the media switches 15A and 15B in the system of this embodiment will be described. Since the media switches 15A and 15B have exactly the same configuration, FIG. 4 shows the configuration of the media switch 15A as a representative.
[0057]
The media switch of this embodiment is configured by, for example, a personal computer. As shown in FIG. 4, the ROM 312, the RAM 313, the LAN interface 314, and the packet processing unit are connected to the CPU 310 via the system bus 311. 315, a voice data packet address conversion unit 316, and a hold tone generation unit 317 are connected.
[0058]
The ROM 312 stores a processing program executed by the media switch 15A such as a program for executing a processing sequence for controlling voice call path generation, holding, and transfer. The RAM 313 is mainly used as a work area when the program of the ROM 312 is executed by the CPU 310.
[0059]
The LAN interface 314 has a function for capturing packetized data transmitted through the LAN 11A and sending the packetized data to the LAN 11A.
[0060]
The packet processing unit 315 has a function of decomposing a received packet and packetizing control data to be transmitted in order to decode message data for control in the packet taken in by the LAN interface 314. . The packet processing unit 315 includes a buffer memory for temporarily storing packetized data for decomposition / generation and packet transmission / reception processing.
[0061]
The voice data packet address conversion unit 316 stores and holds the media standby IP address and port number of the transmitting terminal and the receiving terminal, and the own media standby IP address and port number used at that time. And processing for converting the destination address of the packet. That is, since the voice data packet is sent to the media switch, the media switch converts the destination address of the received packet into the media standby address and port number of the telephone terminal to be finally reached. , It is sent out to the LAN 11A.
[0062]
The hold sound generator 317 is provided to supply a hold sound indicating that the call is being held from the media switch when the call being held is held.
[0063]
[Processing at Call, Hold, Transfer in VoIP Phone System of Embodiment]
Next, processing at the time of calling, holding, and transferring in the VoIP telephone system configured as described above will be described below. First, call, hold, and transfer processing operations in one VoIP phone system will be described, and later, call, hold, and transfer processing with another VoIP phone system terminal using a router will be described. .
[0064]
[1] Call, hold, and transfer processing operations within one VoIP phone system
5 to 8 show processing sequence diagrams of call, hold, and transfer within one VoIP telephone system. In addition, FIGS. 9 to 12 show flowcharts of processing in the main device 12A or 12B at that time. In addition, FIGS. 13 to 15 show flowcharts of processing in the media switch 15A or 15B at that time.
[0065]
The operation of each processing step in the flowcharts of FIGS. 9 to 12 is executed by the CPU 210 of the main apparatus according to the program of the ROM 212, and the operation of each processing step in the flowcharts of FIGS. The CPU 310 executes according to the program stored in the ROM 312.
[0066]
In the example described below, the telephone terminal X of the VoIP telephone system 1A makes a call to another telephone terminal Y in the VoIP telephone system 1A and makes a call between the two, and then the calling terminal X Makes a hold request to hold the call during the call, and the calling terminal X makes a call by making a call to another telephone terminal W of the VoIP telephone system 1A and transfers the held call to the telephone terminal W. In this case, a telephone call is made between the telephone terminal Y and the telephone terminal W.
[0067]
5 to 8, the double solid line arrows indicate transmission of voice data, and the other single line solid arrows indicate transmission of SIP standard call control messages. A dotted arrow indicates local message transmission by a unicast packet.
[0068]
As can be seen from FIG. 5 to FIG. 8, control data is exchanged as a local message using a unicast packet between the main apparatus 12 </ b> A and the media switch 15 </ b> A, and the main apparatus 12 </ b> A and the telephone terminals X, Y, Z Data for control is exchanged between the server and the server using SIP standard messages.
[0069]
[Call using media switch]
With reference to the sequence diagram of FIG. 5, the flowchart of FIG. 9 (operation of the main device 12A), and the flowchart of FIG. 13 (operation of the media switch 15A), the processing up to the formation of the communication path in the VoIP telephone system 1A of this embodiment explain.
[0070]
In this case, first, as shown in FIG. 5, the outgoing message from the outgoing terminal X to the incoming terminal Y is sent to the main apparatus 12A. When the main device 12A determines that it has received this outgoing message (step S101 in FIG. 9), it analyzes the called number included in the outgoing message and determines the destination (in this case, the telephone terminal Y is The call request acceptance message is returned to the caller terminal X (determined as the callee terminal) (step S102).
[0071]
The main device 12A that has received the outgoing message sends a media information setting acquisition request to the media switch 15A (step S103). As described above, this media information setting acquisition request is a local message using a unicast packet, and includes the media standby IP address, port number, and media type information of the transmitting terminal X.
[0072]
When the media switch 15A determines that this media information setting acquisition request has been received (step S201 in FIG. 13), it acquires the media standby IP address, port number, and media type information of the transmitting terminal X and stores them. (Step S202).
[0073]
In this example, the media type information is information indicating that the data is voice data. Therefore, the media switch 15A receives the media information setting acquisition request, thereby receiving a voice data standby IP address of the calling terminal X. And know the port number.
[0074]
Next, the media switch 15A returns the media acquisition information to the main device 12A (step S203). The media acquisition information includes the media standby IP address and port number of the media switch 15A for the transmitting terminal X, and the media standby IP address and port of the media switch 15A for the partner terminal (here, the receiving terminal Y). Including numbers.
[0075]
The main device 12A receives the media acquisition information from the media switch 15A (step S104). Next, the main apparatus 12A sends an outgoing message to the receiving terminal Y (step S105). The outgoing message to the receiving terminal Y at this time includes the media standby IP address, port number, and media type information in the media switch 15A for the receiving terminal Y received from the media switch 15A.
[0076]
Therefore, the receiving terminal Y can recognize the media standby IP address and the port number in the media switch 15A for the terminal Y as the destination address of the voice data for the transmitting terminal X from the outgoing message. Then, if the receiving terminal Y is in a state where it can accept a call request, it returns a call request acceptance message to the main device 12A.
[0077]
The main device 12A determines whether or not a call request acceptance from the receiving terminal Y has been received (step S106). If no call request acceptance has been received, the main apparatus 12A shifts to a call request acceptance failure sequence. Here, the description of the sequence of failure to accept the transmission request is omitted.
[0078]
When it is determined in step S106 that a call request acceptance from the receiving terminal Y has been received, the receiving terminal Y sends a response message including the media standby IP address, port number, and media type information of the receiving terminal Y. Therefore, the main apparatus 12A receives it (step S107).
[0079]
Then, the main apparatus 12A sends the media information setting including the received media standby IP address, port number, and media type of the receiving terminal Y to the media switch 15A (step S108).
[0080]
The media switch 15A monitors whether or not the media information setting from the main apparatus 12A has been received (step S204 in FIG. 13). When it is determined that the media information setting has not been received for a predetermined time (step S205), the transmission is performed. Recognizing that the request is unsuccessful, the information regarding the call setting up to that point is reset (step S206), and the process returns to step S201.
[0081]
If the media switch 15A determines in step S204 that the media information setting has been received, the media switch 15A acquires and stores the media standby IP address, port number, and media type information of the receiving terminal Y as the counterpart terminal. (Step S207).
[0082]
In this example, the media type information is information indicating that the data is audio data. Therefore, when the media switch 15A receives the media information setting, the media switch 15A receives the audio data standby IP address and port of the receiving terminal Y. Know the number.
[0083]
The main device 12A that has transmitted the media information setting to the media switch 15A also transfers a response message including information on the standby IP address, port number, and media type of the media switch 15A for the originating terminal X to the originating terminal X. (Step S109 in FIG. 9).
[0084]
As described above, the main device 12A notifies the media switch 15A of the media standby IP addresses and port numbers of the transmission terminal X and the reception terminal Y, and also transmits the transmission terminal X and the reception terminal Y to The media standby IP address and port number in the media switch 15A for each terminal are notified.
[0085]
The transmitting terminal X and the receiving terminal Y transmit voice data packets for a call with the media standby IP address and port number in the media switch for each terminal as destinations. As a result, a voice call is made between the terminals X and Y (step S110).
[0086]
At this time, the media switch 15A converts the destination address of the voice data packet received from the calling terminal X into the media standby IP address and the port number of the receiving terminal Y in the voice data packet address conversion unit 316, and converts the LAN 11A To the receiving terminal Y (step S208).
[0087]
The media switch 15A also converts the destination address of the voice data packet received from the destination terminal Y into the media standby IP address and port number of the source terminal X in the voice data packet address conversion unit 316, and sends it to the LAN 11A. The data is transmitted and transmitted to the transmitting terminal X (step S208).
[0088]
As described above, in this embodiment, voice data is not exchanged directly between the transmitting terminal X and the receiving terminal Y but via the media switch 15A. FIG. 16 illustrates the flow from transmission to connection in this case. In FIG. 16 as well, a single solid line arrow is a message for SIP standard call control, and a dotted line is a local message by a unicast packet. The audio data is indicated by a double solid line arrow indicating the transmission path.
[0089]
By providing the media switch in this way, in this embodiment, the hold and transfer processes can be performed without providing the hold and transfer functions in the VoIP telephone terminal. The processing operation will be described below.
[0090]
Call hold and transfer processing
FIG. 6 is a sequence diagram for explaining call hold processing, and FIGS. 7 and 8 are sequence diagrams for explaining call transfer processing following hold. 10 to 12 are flowcharts showing call holding and transfer processing operations in the main device 12A or 12B. Further, a part of FIG. 13 and FIGS. 14 to 15 are flowcharts showing call holding and transfer processing operations in the media switch 15A or 15B.
[0091]
6 to 8, the calling terminal X issues a hold request, and then the calling terminal X calls another telephone terminal W in the VoIP telephone system 1A as a transfer destination, and further receives the receiving terminal. This is a case where a transfer request is made to make a call between Y and the transfer destination terminal W. Therefore, in the following description, the main device 12A performs processing of the main device, and the media switch 15A performs processing of the media switch.
[0092]
Main apparatus 12A determines whether or not there is a call termination request from either calling terminal X or receiving terminal Y in the above-described call state (step S121 in FIG. 10). Processing is performed (step S122), and this processing routine is terminated.
[0093]
The end call process includes a process of sending a connection release request for the end call from the main apparatus 12A to the media switch 15A. When the media switch 15A determines that it has received this connection release request (step S209 in FIG. 13), it resets the data for voice data packet address conversion stored in the media switch 15A (step S210) and performs processing. End the routine.
[0094]
On the other hand, as shown in FIG. 6, when the calling terminal X sends a hold request to the main apparatus 12A, the main apparatus 12A detects reception of the hold request (step S123 in FIG. 10), and sends it to the receiving terminal Y. On the other hand, the hold request is transferred (step S124). However, as shown in FIG. 6, the hold request from the calling terminal X includes information that means that the calling terminal X supports only voice data transmission, but is sent from the main device 12A to the receiving terminal Y. The hold request includes information indicating that the media switch 15A supports only voice data transmission.
[0095]
The receiving terminal Y returns that fact to the main apparatus 12A if the terminal has a hold function, and returns a hold error if the terminal does not have a hold function.
[0096]
When the main device 12A returns a message indicating that there is a holding function from the receiving terminal Y, the main device 12A performs a holding operation using the holding function of the receiving terminal Y (step S126 in FIG. 10). Since the main device 12A does not have a hold function from the receiving terminal Y, the hold function using the media switch 15A is activated when a hold error message is returned, and the media switch 15A is connected to the hold medium. A change request is sent (step S127 in FIG. 10).
[0097]
When the media switch 15A receives the pending media connection change request (step S211 in FIG. 14), the media switch 15A holds the voice data path between the partner terminal of the terminal that has requested the suspension, that is, the held terminal and the media switch 15A. To do. In the case of this example, since the calling terminal X has made a hold request, the held terminal is the receiving terminal Y, and the media switch 15A holds the voice data transmission path to the receiving terminal Y (step S212). ).
[0098]
Then, the media switch 15A determines whether or not the connection has been changed (step S213). If the connection has not been changed, the media switch 15A notifies the main device 12A of the connection change result NG (step S214), and returns to step S209. If it is determined in step S213 that the connection has been changed, the media switch 15A sends a connection change result OK to the main device 12A (step S215), causes the hold sound generator 317 to send a hold sound, and sends it to the receiving terminal Y ( Step S216). This hold tone is sent through the voice communication path.
[0099]
On the other hand, the main apparatus 12A that has received the media connection change result from the media switch 15A determines whether the connection change result is OK or NG (step S128 in FIG. 10). When the connection change result is NG, the main device 12A notifies the telephone terminal that has made the hold request that the hold cannot be made (step S129), and the process returns to step S121.
[0100]
If it is determined in step S128 that the connection change result is OK, the main device 12A notifies the telephone terminal that has made a hold request of hold OK (step S130), and enters a hold state (step S131).
[0101]
FIG. 17 is a diagram for explaining the communication paths of the main device 12A, the media switch 15A, the terminal X, and the terminal Y in the hold state.
[0102]
Next, main apparatus 12A determines whether or not the terminal that has requested the hold has issued a hold release request (step S141 in FIG. 11), and when it is determined that a hold release request has been issued, hold release as a connection change request. The request is sent to the media switch 15A (step S142). Then, the process returns to step S121 in FIG.
[0103]
The media switch 15A determines whether or not a hold release request from the main device 12A has been received (step S217 in FIG. 14). When it is determined that a hold release request has been received, the media switch 15A The voice data path between the path of the receiving terminal Y) and the terminal that requested the hold (the transmitting terminal X in this example) is generated again (step S218). Then, the process returns to step S209.
[0104]
Next, as shown in the sequence diagram of FIG. 7, for example, when the calling terminal X makes a call request with the telephone terminal W as the transfer destination terminal (hereinafter referred to as the transfer destination terminal W) during the hold, as follows: Become. That is, this call request message is sent from the call terminal X to the main apparatus 12A. The call request message includes the media standby IP address, port number, and media type of the calling terminal X.
[0105]
When determining that the call request message has been received (step S143 in FIG. 11), the main apparatus 12A returns a call request acceptance to the terminal that has requested the call (step S144). Then, the main apparatus 12A sends a media information setting acquisition request to the media switch 15A in the same manner as described above (step S145). This media information setting acquisition request includes the media standby IP address, port number, and media type information of the calling terminal X.
[0106]
When the media switch 15A determines that it has received this media information setting acquisition request (step S219 in FIG. 14), it acquires the media standby IP address, port number, and media type information of the transmitting terminal X and stores them. (Step S220).
[0107]
Next, the media switch 15A returns the media acquisition information to the main device 12A (step S221). The media acquisition information includes the media standby IP address and port number in the media switch 15A for the sending terminal X, and the media standby in the media switch 15A for the partner terminal (transfer destination terminal W in the example of FIG. 7). Includes IP address and port number.
[0108]
The main device 12A receives the media acquisition information from the media switch 15A (step S146). Next, the main apparatus 12A sends an outgoing message to the transfer destination terminal W as the counterpart terminal (step S147). The outgoing message to the transfer destination terminal W) as the counterpart terminal at this time includes the media standby IP address, port number, and media type information in the media switch 15A for the transfer destination terminal W received from the media switch 15A. included.
[0109]
Therefore, the transfer destination terminal W can recognize the media standby IP address and the port number in the media switch 15A as the destination address of the voice data for the transmission terminal X from the transmission message. Then, if the transfer destination terminal W is in a state where it can accept a call request, it returns a call request acceptance message to the main device 12A.
[0110]
The main device 12A determines whether or not a call request acceptance from the transfer destination terminal W has been received (step S148). If no call request acceptance has been received, the main apparatus 12A shifts to a call request acceptance failure sequence. Here, the description of the sequence of failure to accept the transmission request is omitted.
[0111]
When it is determined in step S148 that the call request acceptance from the transfer destination terminal W has been received, the transfer destination terminal W receives the media standby IP address and port of the counterpart terminal (transfer destination terminal W in the example of FIG. 7). Since the response message including the number and the media type information is sent, the main apparatus 12A receives it (step S149).
[0112]
Then, the main apparatus 12A sends the media information setting including the media standby IP address, port number, and media type of the received transfer destination terminal W to the media switch 15A (step S151 in FIG. 12).
[0113]
The media switch 15A monitors whether or not the media information setting from the main apparatus 12A has been received (step S231 in FIG. 15). When it is determined that the media information setting has not been received for a predetermined time (step S232), the transmission is performed. Recognizing that the request is unsuccessful, the information related to the call setting up to that point is reset (step S233), and the process returns to step S217.
[0114]
If the media switch 15A determines in step S231 that the media information setting has been received, the media switch 15A acquires and stores the media standby IP address, port number, and media type information of the transfer destination terminal W (step S234). .
[0115]
In this example, the media type information is information indicating that the data is audio data. Therefore, the media switch 15A receives the media information setting, thereby receiving the audio data standby IP address of the transfer destination terminal W. Know the port number.
[0116]
The main apparatus 12A that has transmitted the media information setting to the media switch 15A also sends a response message including the standby IP address, port number, and media type of the media switch 15A for the calling terminal X to the hold request in this example. The call is transferred to the calling terminal X, which is a terminal (step S152).
[0117]
As described above, the main device 12A notifies the media switch 15A of the media standby IP addresses and port numbers of the calling terminal X and the transfer destination terminal W, and also sends the media switch 15A to the call terminal X and the transfer destination terminal W. Is notified of the media standby IP address and port number in the media switch for each terminal.
[0118]
Then, the calling terminal X and the transfer destination terminal W transmit a voice call between the two terminals by transmitting the voice data packet for the call with the media standby IP address and the port number in the media switch 15A for each terminal as the destination. Is performed (step S153).
[0119]
At this time, the media switch 15A converts the destination address of the voice data packet received from the calling terminal X into the media standby IP address and port number of the transfer destination terminal W in the voice data packet address conversion unit 316, The data is transmitted to the LAN 11A and transmitted to the transfer destination terminal W (step S235).
[0120]
In the media switch 15A, the destination address of the voice data packet received from the transfer destination terminal W is converted into the media standby IP address and port number of the source terminal X by the voice data packet address conversion unit 316 and then sent to the LAN 11A. The data is transmitted and transmitted to the transmitting terminal X (step S235).
[0121]
As shown in FIGS. 7 and 8, the media switch 15A also holds the call while the calling terminal X makes a call to the transfer destination terminal W to establish a call path between the two terminals. A holding sound is supplied to the terminal Y. The state of the speech path and the path of the call control message at this time is shown in FIG. Also in FIG. 18, double-line arrows indicate voice paths, and solid-line arrows indicate control message transmission paths.
[0122]
In this state, as shown in FIG. 8, when a transfer request is sent from the calling terminal X to the main apparatus 12A and the main apparatus 12A determines that the transfer request has been received (step S154 in FIG. 12), The main apparatus 12A sends a transfer media connection change request to the media switch 15A (step S155).
[0123]
Upon receiving this transfer media connection change request (step S236 in FIG. 15), the media switch 15A generates a voice data path between the transfer destination terminal W and the held terminal Y (step S237). ). In the case of this example, based on the transfer request of the calling terminal X, the media switch 15A forms a voice data transmission path between the receiving terminal Y and the transfer destination terminal W, which were held terminals. To do.
[0124]
Then, the media switch 15A determines whether or not the connection has been changed (step S238). If the connection has not been changed, the media switch 15A notifies the main apparatus 12A of the connection change result NG (step S239), and returns to step S217. When it is determined in step S238 that the connection has been changed, the media switch 15A sends the connection change result OK to the main device 12A (step S240), and stops sending the hold sound from the hold sound generating unit 317 (step S241). .
[0125]
The main device 12A monitors the connection change result from the media switch 15A (step S156 in FIG. 12), and determines that the connection change result is NG, the transfer request terminal, in this example, the calling terminal X The transfer NG is notified (step S157), and the process returns to step S154.
[0126]
If it is determined that the connection change result is OK, a call is made between the held terminal Y and the transfer destination terminal W via the media switch 15A (step S158).
[0127]
That is, as described above, when the hold sound to the held terminal Y stops, the user of the held terminal Y knows that the call transfer is completed and starts a call with the transfer destination terminal W. . The voice data packet for the call at this time is transmitted with the media standby IP address and the port number in the media switch 15A for each of the terminals Y and W as the destination address, so that the voice call is made between both terminals. become.
[0128]
That is, the media switch 15A converts the destination address of the voice data packet received from the terminal W into the media standby IP address and port number of the terminal Y in the voice data packet address conversion unit 316 and sends it to the LAN 11A. , Send to terminal Y. Also, the media switch 15A converts the destination address of the voice data packet received from the terminal Y into the media standby IP address and port number of the terminal W in the voice data packet address conversion unit 316, and sends it to the LAN 11A. Then, the data is transmitted toward the terminal W (step S242).
[0129]
Then, the main device 12A that has received the media connection change result OK sends a transfer acceptance message to the calling terminal X (step S159 in FIG. 12), and determines that it has received a disconnect message from the calling terminal X ( In step S160), a response OK is sent to the calling terminal X, and the calling terminal X is disconnected (step S161). Then, the process returns to step S121 in FIG.
[0130]
As described above, a call can be made between the receiving terminal Y and the transfer destination terminal W that are on hold. That is, the call is transferred. The state of the speech path and the path of the call control message at this time is shown in FIG. Also in FIG. 19, double-line arrows indicate voice paths, and solid-line arrows indicate control message transmission paths.
[0131]
When the main device 12A determines in step S154 in FIG. 12 that it has received a hold release request without receiving a transfer request (step S162), it sends a hold release media connection change request to the media switch 15A. The call path between the calling terminal X and the transfer destination terminal W is disconnected, and the original state of generating the call path between the calling terminal X and the receiving terminal Y is restored (step S163). Then, the process returns to step S121 in FIG.
[0132]
Correspondingly, when the media switch 15A receives the media connection change request for releasing the hold without receiving the media connection change request for the transfer request in step S236 in FIG. 15 (step S243), the media switch 15A The speech path with the transfer destination terminal W is erased, and the voice data path between the calling terminal X that requested the hold and the held terminal Y is generated again (step S244). Then, the process returns to step S209 in FIG.
[0133]
As described above, according to this embodiment, by using the media switch in the VoIP telephone system, holding and transferring between telephone terminals in the VoIP telephone system can be easily performed.
[0134]
In the above description of the embodiment, the hold request is sent from the calling terminal, but it is of course possible to send it from the receiving terminal.
[0135]
In addition, the description of the above-described embodiment is about calling, holding, and forwarding for a plurality of telephone terminals in the same VoIP telephone system, but between the telephone terminals in other VoIP telephone systems using a router. The same can be applied to the call, hold, and transfer. Next, the case will be described.
[0136]
[2] Call, hold, and transfer processing operations between two VoIP phone systems
In the example described below, after a call path is formed between the calling terminal X and the receiving terminal Y in the VoIP telephone system 1A in the sequence shown in FIGS. This is an example in which the calling terminal X performs transfer processing using the terminal Z included in the VoIP telephone system 1B as a transfer destination terminal in a state where the call is held by the hold request.
[0137]
20 and 21 show the main part of the sequence in this case, and are divided into two diagrams for the convenience of the drawing size. 20 shows a processing sequence on the VoIP telephone system 1A side, FIG. 21 shows a processing sequence on the VoIP telephone system 1B side, and FIG. 20 and FIG. , C and D are connected.
[0138]
In FIG. 20 and FIG. 21, the sequence from the terminal X to the terminal Y, where a call is made between the terminals X and Y and then put on hold is as shown in FIG. 5 and FIG. Since it is exactly the same, it was omitted.
[0139]
In FIGS. 20 and 21 as well, a single solid line arrow is a message for SIP standard call control, and a dotted line is a local message by a unicast packet. The audio data is indicated by a double solid line arrow indicating the transmission path.
[0140]
As shown in FIG. 20, in this example, while a call with the held terminal as the terminal Y is being held, the calling terminal X in the VoIP telephone system 1A that has made a hold request has a transfer destination terminal in the VoIP telephone system 1B. An outgoing message designating the telephone terminal Z is sent to the main apparatus 12A. This outgoing message includes information on the called number, media standby address information (IP address and port number) of the sending terminal X, and media type information.
[0141]
When the main apparatus 12A receives this outgoing message, it analyzes the called number included in the outgoing message and determines the destination. Then, main apparatus 12A returns a call acceptance message to call terminal X.
[0142]
The main device 12A sends a media information setting acquisition request to the media switch 15A. This media information setting acquisition request includes information on the media standby IP address and port number of the calling terminal X.
[0143]
Upon receiving the media information setting acquisition request from the main apparatus 12A, the media switch 15A acquires and stores the media standby address information of the transmitting terminal X included therein. Then, the media switch 15A returns the media acquisition information to the main device 12A.
[0144]
This media acquisition information includes the media standby IP address and port number information of the media switch 15A for the transmitting terminal X, and the media standby IP address and port number information of the media switch 15A for the receiving party. . Since the called party is the telephone terminal Z included in the VoIP telephone system 1B, the address information for the called party is recognized by the main apparatus 12A as the media standby address information for the system 1B.
[0145]
Receiving this media acquisition information, the main device 12A sends an outgoing message addressed to the telephone terminal Z to the main device 15B of the VoIP telephone system 1B through the routers 14A and 14B. This outgoing message includes media standby address information (IP address and port number) and media type information of the media switch 15A for the VoIP telephone system 1B.
[0146]
As shown in FIG. 21, the main device 12B that has received the outgoing message to the terminal Z sends a media information setting acquisition request to the media switch 15B in the VoIP telephone system 1B. This media information setting acquisition request includes information on the media standby IP address and port number of the media switch 15A.
[0147]
Upon receiving this media information setting acquisition request, the media switch 15B acquires and stores information on the media standby IP address and port number of the media switch 15A included therein. Then, the media switch 15B returns the media acquisition information to the main device 12B.
[0148]
This media acquisition information includes information on the media standby IP address and port number of the media switch 15B for the media switch 15A, and information on the media standby IP address and port number of the media switch 15B for the receiving party. . Since the called party is the telephone terminal Z, the address information for the called party is recognized by the main apparatus 12B as the media standby IP address and port number information for the called terminal Z.
[0149]
Receiving this media acquisition information, the main apparatus 15B transfers the outgoing message to the receiving terminal Z. This outgoing message includes the media standby IP address and port number information of the media switch 15B for the receiving terminal Z, and the media type information.
[0150]
Therefore, the receiving terminal Z can recognize the media standby IP address and the port number in the media switch 15B as the destination address of the voice data for the transmitting terminal X from the outgoing message. Then, if the receiving terminal Z is in a state where it can accept a call request, it returns a call request acceptance message to the main device 12B.
[0151]
Also, the receiving terminal Z returns a response message including the media standby IP address and port number information of the receiving terminal Z and the media type information to the main apparatus 12B. The main device 12B sends the media information setting including the received media standby IP address and port number information and media type information of the receiving terminal Z to the media switch 15B. By receiving this media information setting, the media switch 15B knows and stores the voice data standby address information of the receiving terminal Z.
[0152]
The main apparatus 12B that transmitted the media information setting to the media switch 15B sends a response message including the media standby IP address and port number information and the media type information of the media switch 15B through the routers 14B and 14A to the VoIP telephone system 1A. Transfer to main device 12A.
[0153]
The main apparatus 12A that has received this response message sends the media information setting including the media standby address information of the received media switch 15B to the media switch 15A. The media switch 15A stores the media standby address information of the media switch 15B as media standby address information for the receiving terminal Z.
[0154]
The main apparatus 12A that has received the response message also sends the media waiting address information and media type information of the media switch 15A for the transmitting terminal X received from the media switch 15A to the transmitting terminal X. The transmitting terminal X recognizes the media standby address information of the media switch 15A for the transmitting terminal X as address information for receiving the voice data packet from the receiving terminal Z.
[0155]
As described above, when a call control message is exchanged, voice data packets are exchanged between the calling terminal X and the receiving terminal Z through the media switches 15A and 15B, and a call is performed.
[0156]
That is, from the sending terminal X, a voice data packet is sent with the media standby IP address and port number for the sending terminal X of the media switch 15A notified from the main device 12A by sending and receiving the call control message as the destination address. Therefore, the voice data packet from the calling terminal X is received by the media switch 15A.
[0157]
Upon receiving this voice data packet, the media switch 15A converts the destination address into media standby IP address and port number information for the media switch 15A of the media switch 15B, and sends it to the IP network 2 through the router 14A. Accordingly, the voice data packet from the media switch 15A is received by the media switch 15B through the router 14B of the VoIP telephone system 1B.
[0158]
The media switch 15B converts the destination address of the received voice data packet into information on the media standby IP address and port number of the receiving terminal Z and sends it out. Therefore, the voice data packet reaches the receiving terminal Z.
[0159]
On the other hand, from the receiving terminal Z, a voice data packet is transmitted with the media standby IP address and port number for the receiving terminal Z of the media switch 15B notified from the main device 12B by sending / receiving the call control message as the destination address. . Therefore, the voice data packet from the receiving terminal Z is received by the media switch 15B.
[0160]
Upon receiving this voice data packet, the media switch 15B converts the destination address into a media standby IP address and port number for the media switch 15B of the media switch 15A, and sends them to the IP network 2 through the router 14B. Therefore, the voice data packet from the media switch 15B is received by the media switch 15A through the router 14A of the VoIP telephone system 1A.
[0161]
The media switch 15A converts the destination address of the received voice data packet into media standby address information of the transmitting terminal X and sends it out. Therefore, the voice data packet reaches the calling terminal X.
[0162]
FIG. 22 shows a call control message from the transmission from the calling terminal X to the receiving terminal Z to the formation of the communication path, and the route and the state of the communication path. In FIG. 22 as well, double-line arrows indicate voice paths, dotted lines indicate local message transmission paths using unicast packets, and solid-line arrows indicate control system message transmission paths.
[0163]
FIG. 22 illustrates not only a call from the calling terminal X to the receiving terminal Z but also a general calling operation from the calling terminal X to the receiving terminal Z in the hold state. Yes.
[0164]
Returning to FIG. 20, after the calling terminal X calls the terminal Z as the transfer destination and makes a call between both terminals as described above, the calling terminal X makes a transfer request to the main apparatus 12A. When sent, the main apparatus 12A sends a media connection change request for requesting the terminal Y and the terminal Z to be connected to the media switch 15A.
[0165]
In the media switch 15A, a holding sound is sent to the receiving terminal Y, the communication path between the media switch 15A and the receiving terminal Y is held, and the held receiving terminal Y and terminal Z are held. Change the call path to connect.
[0166]
That is, until the media switch 15A converts the destination address information so that the voice data packet from the terminal Z is sent to the terminal X, the voice data packet from the terminal Z is sent to the terminal Y. Change the conversion of the destination address information as follows. Then, the destination address of the voice data packet from the terminal Y is sent as the media standby address information of the media switch 15B so as to be sent to the terminal Z.
[0167]
Then, when the media connection can be changed, the media switch 15A sends OK to the main apparatus 12A as a media connection change result. When the main device 12A receives this media connection change result OK, it returns a transfer acceptance message to the calling terminal X. Upon receiving the transfer acceptance message, the calling terminal X returns a disconnect message to the main device 12A. The main apparatus 12A returns the response message OK to the transmission terminal X, and the transfer is completed.
[0168]
In the above example, the calling terminal X that is talking to the terminal Y in the same VoIP telephone system makes a hold request, and then the terminal Z in a different VoIP telephone system is called to make a call between the terminal Y and the terminal Z. However, the calling terminal X is put on hold in a state where a call is made from the calling terminal X in the VoIP telephone system 1A to the receiving terminal Z in a different VoIP telephone system 1B. When making a request and transferring it to another terminal in the VoIP telephone system 1A in which it is included, the receiving terminal Z also makes a hold request and transfers it to another terminal in the VoIP telephone system 1B in which it is included. This is also applicable to the case of making it.
[0169]
[Description of simultaneous voice call]
The above description is for the case of call holding and transfer. By using the media switch, simultaneous voice call in a so-called business button telephone becomes possible. When equipped with the function for simultaneous voice call, the non-volatile memory provided in the main device of the VoIP telephone system stores in advance the terminals constituting the group for the simultaneous voice call. A plurality of simultaneous voice call groups can be registered, and a special number (paging special number) is assigned in advance to each group.
[0170]
This simultaneous voice call processing can be performed by using multicast packets, and multicast packets cannot be transmitted across routers. Therefore, in this example, a simultaneous voice call (hereinafter referred to as a simultaneous voice call) within one VoIP telephone system is used. (Calling is called paging).
[0171]
FIG. 23 is a diagram illustrating an example of a processing sequence of this paging. In the example of FIG. 23, in the VoIP telephone system 1A, three telephone terminals A, B, and C form a paging group, and a call to a paging special number specifying this paging group is sent from the terminal A. This is the case.
[0172]
That is, as shown in FIG. 23, first, an outgoing message from the telephone terminal A to a paging special number that designates a group of three telephone terminals A, B, and C is sent to the main apparatus 12A.
[0173]
The main apparatus 12A that has received the outgoing message to the paging special number activates the paging service. Then, main apparatus 12A returns a call acceptance message to calling terminal A, and sends a paging media information setting acquisition request to media switch 15A. This media information setting acquisition request includes information on the media standby IP address and port number of the calling terminal A.
[0174]
Upon receiving this media information setting acquisition request, the media switch 15A returns a media information setting acquisition response to the main apparatus 12A. This media information setting acquisition response includes the media standby IP address and port number information and media type of the media switch 15A for the terminal A, and the source multicast address information transmitted by the media switch 15A.
[0175]
The main apparatus 12A that has received the media information setting acquisition response returns a paging response message including information on the media standby IP address and port number of the media switch 15A for the terminal A and media type information to the calling terminal A. As a result, the transmitting terminal A recognizes to use the media standby IP address and port number information of the media switch 15A as the destination of the voice data packet transmitted for paging.
[0176]
The main device 12A also sends a paging start request including source multicast address information transmitted by the media switch 15A to the terminals A, B, and C by multicast packets.
[0177]
Then, when the calling terminal A sends the voice data to the media switch 15A by a unicast packet, the media switch 15A changes the received unicast packet of the voice data to a multicast packet to the terminals A, B, and C. And send it out.
[0178]
As described above, in this embodiment, simultaneous voice call processing can be performed by using the media switch.
[0179]
[Other Embodiments]
In the above-described embodiment, the main device and the media switch are provided separately. However, the function unit of the media switch may be provided in the main device. In that case, the hold sound is sent from the main device.
[0180]
In the description of the above embodiment, the function of holding and transferring using the media switch is activated only when a response indicating that the partner terminal has a holding function is returned and a response indicating that there is no holding function is returned. However, it is of course possible to activate the hold / transfer function using the media switch without inquiring whether the partner terminal has the hold function.
[0181]
【The invention's effect】
As described above, according to the present invention, voice data transmission path control means is provided, and voice data is exchanged via the voice data transmission path control means, thereby holding and transferring to each VoIP telephone terminal. These additional functions can be realized without providing additional functions such as a voice call or simultaneous voice call.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a configuration example of an embodiment of a VoIP telephone system according to the present invention;
FIG. 2 is a diagram illustrating a configuration example of a VoIP telephone terminal used in the embodiment.
FIG. 3 is a diagram illustrating a configuration example of a main device used in the embodiment.
FIG. 4 is a diagram illustrating a configuration example of audio data transmission path control means (media switch) used in the embodiment.
FIG. 5 is a diagram for explaining a sequence from call origination to call path generation in the VoIP telephone system of the embodiment.
FIG. 6 is a diagram for explaining a sequence when a call is put on hold from a call in the VoIP telephone system according to the embodiment.
7 is a diagram for explaining a part of a sequence when a call is transferred from a call holding state in the VoIP telephone system according to the embodiment; FIG.
FIG. 8 is a diagram for explaining the continuation of the sequence when a call is transferred from a call holding state in the VoIP telephone system according to the embodiment;
FIG. 9 is a part of a flowchart for explaining the processing operation of the main device of the VoIP telephone system of the embodiment.
FIG. 10 is a part of a flowchart for explaining the processing operation of the main device of the VoIP telephone system according to the embodiment.
FIG. 11 is a part of a flowchart for explaining the processing operation of the main device of the VoIP telephone system according to the embodiment.
FIG. 12 is a part of a flowchart for explaining the processing operation of the main device of the VoIP telephone system of the embodiment;
FIG. 13 is a part of a flowchart for explaining the processing operation of the media switch of the VoIP telephone system of the embodiment.
FIG. 14 is a part of a flowchart for explaining the processing operation of the media switch of the VoIP telephone system according to the embodiment;
FIG. 15 is a part of a flowchart for explaining the processing operation of the media switch of the VoIP telephone system according to the embodiment.
FIG. 16 is a diagram for explaining a call path and a transmission path for a control message for generating the call path in the VoIP telephone system according to the embodiment;
FIG. 17 is a diagram for explaining a call path and a control message transmission path in a hold state in the VoIP telephone system according to the embodiment;
FIG. 18 is a diagram for explaining a call path and a control message transmission path when performing a call with a transfer destination telephone terminal in the hold state in the VoIP telephone system according to the embodiment;
FIG. 19 is a diagram for explaining a call path and a control message transmission path when transfer is made from the hold state to the transfer destination telephone terminal in the VoIP telephone system of the embodiment;
FIG. 20 is a diagram illustrating a sequence when a call on hold is transferred to a telephone terminal in another VoIP telephone system using the VoIP telephone system of the embodiment.
FIG. 21 is a diagram illustrating a sequence when a call on hold is transferred to a telephone terminal in another VoIP telephone system using the VoIP telephone system of the embodiment.
FIG. 22 is a diagram for explaining a communication path and a control message transmission path when making a call with a telephone terminal in another VoIP telephone system using the VoIP telephone system of the embodiment;
FIG. 23 is a diagram for explaining a sequence when a simultaneous voice call is performed using the VoIP telephone system of the embodiment.
FIG. 24 is a diagram showing a possible configuration of the VoIP telephone system.
FIG. 25 is a diagram for explaining a call path and a control message transmission path when a call is made using the VoIP telephone system of FIG. 24;
FIG. 26 is a diagram showing a sequence example when a call is made using the VoIP telephone system of FIG.
FIG. 27 is a diagram for explaining a communication path and a control message transmission path when making a call with a telephone terminal in another VoIP telephone system using the VoIP telephone system of FIG. 24;
[Explanation of symbols]
1A, 1B VoIP telephone system
11A, 11B LAN (IP network)
12A, 12B Main unit
13A1-13An, 13B1-13Bm VoIP telephone terminals
14A, 14B router
15A, 15B Media switch (voice data transmission path control means)

Claims (5)

A plurality of VoIP telephone terminals connected to B over local area network,
Main device means connected to the local area network, for sending and receiving control messages related to calls, and for controlling communications;
Voice data transmission path control means connected to the local area network to form a voice data transmission path between the VoIP telephone terminal and a partner terminal;
A VoIP telephone system comprising:
The main device means includes
Means for transmitting address information for transmission and reception of the voice data on the caller side and the callee side to the voice data transmission path control means;
Against said calling and said called party, and means for communicating the address information for transmitting and receiving voice data between said audio data transmission channel control unit,
With
The voice data transmission path control means is
Address information for transmission / reception of the voice data between the voice data transmission path control means and the caller side and the callee side, which the main unit means conveys to the caller side and the callee side, The means to tell
Means for receiving address information for transmission / reception of the voice data between the voice data transmission path control means and the calling side and the called side from the main unit means;
Music on hold generation means;
With
By the calling and the called party, there use the voice said address information received via said main device unit from the data transmission line control unit, and with the destination address information for transmission of voice data, the voice The data is transmitted between the calling side and the called side via the voice data transmission path control means , and
The main device means includes
Means for sending a connection change request based on the hold request to the voice data transmission path control means when a hold request is received from one of the terminals during a call between the caller and the callee; Prepared,
The voice data transmission path control means is
Means for holding a voice data transmission path between the counterpart terminal of the terminal that made the hold request and the voice data transmission path control means when receiving a connection change request based on the hold request;
Means for sending a hold sound from the hold sound generating means to the counterpart terminal of the terminal that has requested the hold during the hold;
A VoIP telephone system comprising: The VoIP telephone system according to claim 1 ,
The main device means includes
Means for sending address information for transmission / reception of the voice data to the voice data transmission path control means in another terminal that is a transfer destination of the call on hold;
Means for transmitting address information for transmission / reception of the voice data in the voice data transmission path control means to the other terminal of the transfer destination,
The voice data transmission path control means is
Means for receiving from the main unit means address information for sending and receiving the voice data at the other terminal to which the call on hold is transferred;
Upon receiving a transfer request from the terminal requesting the hold to the other terminal via the main device means, the audio data between the other terminal of the terminal requesting the hold and the other terminal Means for controlling to send and receive audio data via the transmission path control means;
A VoIP telephone system comprising: In the VoIP telephone system according to claim 1 or 2,
A VoIP telephone system comprising relay means provided between the local area network and an IP (Internet protocol) network . A plurality of VoIP telephone terminals connected to the local area network;
Main device means connected to the local area network, for sending and receiving control messages related to calls, and for controlling communications;
Voice data transmission path control means connected to the local area network, for forming a voice data transmission path between the VoIP telephone terminal and the counterpart terminal, comprising a holding tone generation means;
In a VoIP telephone communication method in a VoIP telephone system comprising :
The main device means includes
For the voice data transmission line control unit, a step of carrying the address information for the transmission and reception of the voice data in the calling side and the called party,
Transmitting address information for transmission / reception of the voice data between the voice data transmission path control means to the caller and the callee ;
With
The voice data transmission path control means is
Address information for transmission / reception of the voice data between the voice data transmission path control means and the caller side and the callee side, which the main unit means transmits to the caller side and the callee side, The process of telling
Receiving address information for transmission / reception of the voice data between the voice data transmission path control means and the calling side and the called side from the main unit means;
With
By the calling and the called party, there use the voice said address information received via said main device unit from the data transmission line control unit, and with the destination address information for transmission of voice data, the voice The data is transmitted between the calling side and the called side via the voice data transmission path control means , and
The main device means includes
A step of sending a connection change request based on the hold request to the voice data transmission path control means when a hold request is received from any one terminal during a call between the caller and the callee Prepared,
The voice data transmission path control means is
When receiving a connection change request based on the hold request, holding a voice data transmission path between the counterpart terminal of the terminal that has made the hold request and the voice data transmission path control means;
A method for controlling communication in a VoIP telephone system , comprising: a step of sending a hold sound from the hold sound generation means to a counterpart terminal of the terminal that has made a hold request during the hold . In the communication control method in the VoIP telephone system according to claim 4 ,
Sending address information for transmission / reception of the voice data to another terminal as a transfer destination of the call on hold to the voice data transmission path control means;
Telling the other terminal of the transfer destination address information for sending and receiving the voice data in the voice data transmission path control means;
When receiving a transfer request to the other terminal, voice data is exchanged between the counterpart terminal of the terminal that has requested the suspension and the other terminal via the voice data transmission path control means. A process of controlling
A communication control method in a VoIP telephone system.

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