JP2005039342A - Router and control method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video recording function and a sound recording function with a simple configuration to a videophone terminal and an IP phone terminal used by a general user at its home and introduced to a LAN inside an enterprise in a small scale. <P>SOLUTION: A router 100 interconnecting the LAN and a PAN to relay an IP packet to a transmission destination is provided with: a speech history generating section 109 for generating history information of communication by the IP phone in the LAN or the PAN; and an RTP packet storage section 110 for storing an RTP voice packet and / or an RTP video packet from an IP communication apparatus. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a router that connects networks to each other and relays IP packets to a transmission destination, and more particularly to a call in a router that relays an IP communication device such as an IP phone that performs voice and / or video communication using IP packets. Related to history creation technology.
[0002]
[Prior art]
Non-Patent Document 1 described later discloses a router technique for applying an IP phone / video phone to a private area network. Two methods are introduced here.
[0003]
One method is to rewrite the source private address stored in the data part of the IP packet received from the private area network (PAN) to the global address of the router and transmit it to the LAN, and record the conversion table, In this method, the destination address in the header part of the IP packet received from the LAN is converted back to a private address by referring to the conversion table and rewritten and transmitted to the PAN. This method is mainly described in H.C. It is used for IP phones / videophones compliant with the H.323 standard.
[0004]
Another method is to notify the router's LAN-side global address in advance to the IP telephone device or videophone device, and the device side converts the address stored in the data portion of the IP packet into the notified global address in advance. It is a method of sending. This method is mainly used for IP telephones / videophones compliant with the SIP standard.
[0005]
FIG. 12 is a diagram illustrating a configuration of the router 200 using the former method.
[0006]
201 is a LAN interface (i / f) that is connected to a local area network (LAN) and a global address is assigned to the port, 202 is connected to a private area network (PAN), and a private address is assigned to the port PANi / f.
[0007]
A filtering unit 203 performs filtering of packets received from the LANi / f 201 as necessary according to user settings, and a filtering unit 204 performs filtering of packets received from the PANi / f 202 as necessary according to user settings. is there.
[0008]
Reference numeral 205 denotes a packet monitoring / path control unit that determines to which i / f a packet received from the LAN i / f 201 and the PANi / f 202 is sent or discarded.
[0009]
Reference numeral 206 denotes an address conversion unit that performs address conversion between a packet received from the LAN and a packet received from the PAN.
[0010]
A DHCP server function unit 207 assigns a private address to a PC or IP videophone device connected to the PANi / f 202 and the PAN.
[0011]
208 designates packets transmitted and received between an IP phone or IP videophone connected to the PAN and an IP phone or IP videophone connected to the LAN. H.323 analyzed according to the H.323 standard and stored in the data portion of the packet. The protocol analysis unit instructs the address conversion unit 206 to convert the H.245 address.
[0012]
FIG. 13 shows an H.264 using the router 200 described above. It is a figure which shows the structure of a H.323 communication system.
[0013]
In the router 200 connected to both the LAN and the PAN, the LAN i / f 201 has a valid global address in the LAN, and the PANi / f 202 has a valid private address only in the PAN.
[0014]
The IP videophone 301, the PC 302, and the PANi / f 202 of the router 200 constitute a private area network (PAN) together with the HUB 401, and the IP address is assigned by the DHCP server function unit 207 of the router 200. Since this private address is valid only within the PAN, it cannot be accessed from the LAN 402 to this address. Therefore, when connecting from the IP videophone 303 to the IP videophone 301 inside the PAN, it is necessary to make a call with the global address of the router 200 as the destination.
[0015]
In the packet monitoring / path control unit 205 of the router 200, The packet received at the port number 1720 defined as the call connection packet reception port number in the H.323 standard is transferred to the IP videophone device 301 that is determined in advance as the default receiving device by the user setting. Determine the path.
[0016]
The address conversion unit 206 of the router 200 converts the destination IP address of the packet into the private address of the IP videophone device 301 and transfers it to the PAN. The IP videophone device 301 sends a response packet addressed to the IP videophone device 303 to the router PANi / f 202.
[0017]
The router 200 sends the packet received from the PANi / f 202 to the address translation unit 206. For packets transmitted from the PAN to the LAN, the address conversion unit 206 performs two-stage address conversion.
[0018]
In the first stage, the source IP address constituting the header part of the IP packet is converted from the private address of the IP videophone 301 to the global address of the LAN i / f 201 of the router 200. At the same time, the address conversion unit 206 creates and stores a correspondence table between the private address of the IP videophone 301 and the port number used in the higher-level protocol TCP or UDP protocol. The purpose of use of this table is to determine to which device of the PAN a packet addressed to the router from the LAN should be transferred.
[0019]
The second stage is H.264 stored in the data part of the IP packet. 245 address is converted. This H. The 245 address is the Q.Q of the call connection phase. 931 Connect packet, 245OpenLogicalChannel request or H.264. It is stored in the data part of the 245OpenLogicalChannelAck response packet as necessary.
[0020]
H. of router 200 225 & H. The H.245 protocol analysis unit 208 analyzes the packet passing through the address conversion unit 206 and stores the H.264 protocol stored in the data portion of the packet received from the IP videophone 301. The address conversion unit 206 is instructed to convert the H.245 address from the private address of the IP videophone 301 to the global address possessed by the LAN i / f 201 of the router 200.
[0021]
The address conversion unit 206 receives the packet H.264. 245 address is converted. At this time, H.C. A correspondence table of private addresses and port numbers of 245 addresses is created and stored.
[0022]
When the IP videophone 303 completes the call connection, the H.P. Proceed to master-slave determination and capability exchange phase using H.245 control channel. H.B included in the data portion of the Connect packet received from IP videophone 301. H. 245 address. 245 packets are transmitted. Since this is converted to the address of the LAN i / f 201 of the router 200, the packet is sent to the LAN i / f 200 of the router 200.
[0023]
The packet monitoring / route control unit 205 of the router 200 compares the destination port number of the received packet with the conversion correspondence table in the address conversion unit 206 and determines that the destination of the packet is the IP videophone 301. The packet is sent to the address conversion unit 106, the destination address is converted into the private address of the IP videophone 301, and transferred from the PANi / f 202 to the IP videophone 301.
[0024]
Audio data is transmitted as an RTP stream. Call control data is transmitted in TCP packets, whereas RTP streams are transmitted in UDP packets. The UDP packet is also converted by the address conversion unit 206 of the router 200 in the same manner as the TCP packet. That is, the voice packet from the IP videophone 301 is transferred to the IP videophone 303 after the source address of the IP header is converted from the private address to the global address of the router. The voice packet from the IP videophone 303 is transferred to the IP videophone 301 after the destination address of the IP header is converted from the global address of the router to the private address of the IP videophone 301.
[0025]
The operation of the conventional router has been described above. It is also possible to start a call first from the IP videophone 301. Also in this case, it is possible to determine that the transmission destination of the packet received from the LAN is the IP videophone device, based on the private address / port number correspondence table created by the address conversion unit 206.
[0026]
By the way, the conventional router as described above does not have a voice data recording function or a video data recording function, and it is necessary to realize the functions by individual IP telephone devices and videophone devices.
[0027]
However, the current mainstream telephone type IP phone dedicated device or IP video phone dedicated device and the set top box type video conference system used in addition to the TV monitor do not have a hard disk. There is only a built-in flash memory, etc., and there are few recording / recording functions. Even with this function, there is a problem that only a short time recording can be performed due to a small amount of data that can be recorded.
[0028]
In addition, in a system that realizes a video conference by adding hardware to a personal computer (PC) or a system that is completely realized by software of a PC, recording in a hard disk is possible in principle. However, even in such a case, when a plurality of videophone devices are used, there is a problem that recording data and recording histories are stored separately in each device, making it difficult to use.
[0029]
On the other hand, Patent Document 1 discloses a router device that operates as a gateway between an ordinary telephone and an IP telephone connected to an ISDN line and a LAN, and a voice response device and a voice recording device that are connected to the router device via a HUB. A call center system equipped with a voice response / recording unit comprising:
[0030]
[Non-Patent Document 1]
“Understanding VoIP”, Nikkei NETWORK, Nikkei BP, June 2002 Special Feature Article
[Patent Document 1]
JP 2002-16708 A
[0031]
[Problems to be solved by the invention]
However, the system disclosed in Patent Document 1 is a large-scale dedicated system used in a company call center, and records calls from the general public network. Therefore, it is not suitable for an Internet telephone environment that is easily used by general users or individual users inside a company.
[0032]
Therefore, an object of the present invention is to provide a recording function and a recording function with a simple configuration for a videophone terminal or an IP telephone terminal that is used by a general user at home or introduced on a small scale in a company internal LAN. It is to provide.
[0033]
Another object of the present invention is to provide a recording function and a recording function that can be shared by a plurality of videophone terminals and IP telephone terminals used by a user.
[0034]
Still another object of the present invention is to provide a simple method for confirming and reproducing a recorded or recorded call image or call voice.
[0035]
[Means for Solving the Problems]
According to one aspect of the present invention, for example, a router that interconnects networks and relays an IP packet to a destination, history creation means for creating history information of communication by an IP communication device in the network; There is provided a router having storage means for storing voice and / or video from the IP communication device.
[0036]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
[0037]
FIG. 1 is a diagram illustrating a configuration of the router 100 according to the present embodiment. This router connects different networks to each other and relays IP packets to a destination.
[0038]
101 is a LAN interface (i / f) connected to a local area network (LAN) and a global address is assigned to the port, 102 is connected to a private area network (PAN), and a private address is assigned to the port PANi / f.
[0039]
A filtering unit 103 performs filtering of packets received from the LAN i / f 101 as necessary according to user settings, and a filtering unit 104 performs filtering of packets received from the PANi / f 102 as necessary according to user settings.
[0040]
Reference numeral 105 denotes a path control unit that determines which interface the packet received from the LANi / f 101 and the PANi / f 102 is sent to or the packet is discarded.
[0041]
Reference numeral 106 denotes an address conversion unit that performs address conversion between a packet received from the LAN and a packet received from the PAN. 107 is a DHCP server function unit that assigns a private address to a connected device such as a PC or IP telephone device connected to PAN / f102 and PAN, and 108 is a packet received from an IP telephone device connected to the PAN. . H.323 analyzed according to the H.323 standard and stored in the data portion of the packet. The protocol analysis unit instructs the conversion of the H.245 address and further analyzes information such as a call destination and a call source from the packet.
[0042]
Reference numeral 109 denotes a call history creation unit that receives information such as a caller address, a call destination address, and a call time from the protocol analysis unit 108 and creates a call history. Reference numeral 110 denotes an RTP packet storage unit that stores RTP packets related to the current call and stores them in a file in accordance with instructions from the protocol analysis unit 108.
[0043]
111 is a stream data conversion unit that converts the created RTP packet file into a format suitable for publication on the WWW server, 112 is an XML data creation unit that creates data for publishing call history and stream data, A WWW server unit 113 publishes a page created by the XML data creation unit 112 to a browser of a device connected to the PAN or a browser of a device connected to the LAN.
[0044]
FIG. 2 is a diagram showing a configuration of a communication system including the router 100. The communication system described here assumes a scale that can be applied to an in-house LAN in a certain company.
[0045]
Reference numeral 401 denotes a HUB connected to the 100BASE-T port of the PANi / f 102 of the router 100, 301 denotes an IP telephone apparatus as an IP communication apparatus connected to the router 100 via the HUB 401, and 302 denotes the router 100 via the HUB 401. Is a personal computer (PC) as another IP communication device that is connected to the computer and operates a videophone application. These HUB 401, IP telephone apparatus 301, and PC 302 constitute a private area network (PAN).
[0046]
Reference numeral 402 denotes a LAN connected to the LAN i / f 101 port of the router 100, and 303 denotes an IP telephone device connected to the LAN 402 via a network connection device such as a router or HUB (not shown).
[0047]
The operation of the router 100 will be described with reference to FIG.
[0048]
First, the IP address assigned to each device will be described. The IP telephone device 303 connected to the LAN 402 and the LANi / f 101 of the router 100 each have a fixed global IP address, and the PANi of the router 100 A private IP address (hereinafter, “private address”) is assigned by the DHCP server function unit 107 of the router 100 to the IP telephone apparatus 301 and the PC 302 connected to / f102 and the PAN.
[0049]
Here, it is assumed that the private addresses of IP telephone apparatus 301 and PANi / f 102 are assigned as follows.
[0050]
IP telephone device 301: 192.168.2.2,
PANi / f102: 192.168.2.1
[0051]
Assume that the global IP addresses (hereinafter referred to as “global addresses”) of the IP telephone device 303 and the LAN i / f 101 are assigned as follows.
[0052]
IP telephone device 303: 152.20.10.10.
LANi / f101: 152.20.10.50
[0053]
Now, a call is made from the port number 1757 of the IP telephone apparatus 301 (private address 192.168.2.2) in the PAN to the IP telephone 303 (global address 152.20.10.100) in the LAN 402. In this case, the global address of the IP phone 303 is set as the transmission destination. A Setup (connection request) packet is transmitted using the public port 1720 defined in the H.225 standard as a transmission destination port, and the packet is received by the PANi / f 102 of the router 100.
[0054]
Hereinafter, in order to simplify the description, a combination of an IP address and a port number is referred to as a transport address, and is expressed by a notation such as “IP address: port number”. According to this notation, the destination of the Setup packet is 152.20.10.100:1720, and the source of the Setup packet is 192.168.2.2:1757.
[0055]
The route of the received packet is determined by the route control unit 105 to LANi / f 101, and is sent to the address conversion unit 106 via the filtering unit 104. The address conversion unit 106 converts the source address of the packet from the private address 192.168.2.2 to the address 152.20.10.50 of the LANi / f101. The port number 1757 is not converted. As a result, the source transport address of the packet is 152.20.10.50:1757.
[0056]
At the same time, the address conversion unit 106 stores a combination of the source private address 192.168.2.2 and the port number 1757 as table data.
[0057]
The converted packet is transmitted to the LAN 402 via the filtering unit 103 and the LAN i / f 101 and received by the IP telephone device 303.
[0058]
The protocol analysis unit 108 analyzes the Setup packet from the IP telephone apparatus 301 and extracts the following information.
-Source address (192.168.2.2),
-Destination address (152.20.10.100),
・ Calling party alias address,
E. 164 addresses,
・ H. 323-ID,
・ Terminal type
[0059]
The calling party alias address is an optional element and may not have any information. E. if registered with the gatekeeper. The registration number is entered at 164 address. H. A user name, a terminal name, and the like are entered in 323-ID.
[0060]
The IP telephone apparatus 303 returns a Connect (connection complete) packet with the global address 152.20.10.50 and the port number 1757 of the router 100 as destinations. This packet includes H.264, which is performed after the call connection phase. The transport address 152.20.10.10.00: 1025 used in the H.245 negotiation phase is stored.
[0061]
The path control unit 105 refers to the address conversion table, confirms that the private address corresponding to the port number 1757 is 192.168.2.2, and passes the packet to the address conversion unit 106.
[0062]
The address conversion unit 106 converts the transmission destination address of the packet into the private address 192.168.2.2 of the IP telephone apparatus 301 and transmits it to the IP telephone apparatus 301 via the PANi / f102. The port number 1757 is not converted. As a result, the destination transport address of the packet becomes 192.168.2.2:1757.
[0063]
The protocol analysis unit 108 analyzes the Connect packet from the IP telephone device 303 and extracts the following information.
-Source address (192.168.2.2),
-Destination address (152.20.10.100),
・ Calling party alias address
E. 164 addresses,
・ H. 323-ID
[0064]
The called party alias address is an optional element and may not have any information. E. if registered with the gatekeeper. The registration number is entered at 164 address. H. A user name and a terminal name are entered in 323-ID. Furthermore, the arrival time of the packet is recorded. This time is the connection start time of the line.
[0065]
The IP telephone apparatus 301 receives the H.264 received in the Connect packet. H.245 transport address as the destination. Perform the negotiation phase using 245 channels. H. In the negotiation phase using 245 channels, master / slave determination and terminal capability exchange are mainly performed.
[0066]
H. If the port number of the IP telephone apparatus 301 used in the 245 channel is 1759, for example, the transmission destination of the packet sent out from the IP telephone apparatus 301 is 152.20.10.100:1025, and the transmission source is 192.168. 2.2: 1759.
[0067]
The address conversion unit 106 converts the transmission source of the packet header to 152.20.10.50:1759. At the same time, the correspondence between the private address 192.168.2.2 and the port number 1759 is recorded in the address conversion table.
[0068]
The transmission source of the packet sent out from the IP telephone apparatus 303 is 152.20.10.10.00: 1025, and the transmission destination of the packet is 152.20.10.50:1759.
[0069]
The protocol analysis unit 108 analyzes the capability exchange packet from the IP telephone device 303 and extracts the following information.
・ Capability information of the calling terminal,
・ Capability information of the called terminal
[0070]
From the extracted capability information, for example, the IP telephone device 303 has an audio transmission / reception capability. It can be confirmed that encoding is performed with 711 μ-law.
[0071]
When it is mutually confirmed that the voice transmission / reception capability is obtained by the terminal capability exchange, a request for opening a logical channel (OpenLogicalChannel) for transmitting the RTP voice packet from the IP telephone apparatus 301 is sent to the destination 152.20.10.100: It is transmitted at 1025.
[0072]
This packet stores a source UDP address 192.168.2.2:49605 used in an RTCP packet that is a control channel for RTP voice packets. The router converts the UDP address in the data to the global address 152.20.10.50:49605 of LANi / f101.
[0073]
The protocol analysis unit 108 analyzes the logical channel establishment request packet from the IP telephone apparatus 301 and extracts the following information.
・ Logical channel number,
·data type,
Transport address used by the media control channel
[0074]
From the above data type, for example, the IP telephone apparatus 301 has audio transmission / reception capability, It can be confirmed that encoding is performed with 711 μ-law.
[0075]
The IP telephone device 303 receives the request packet and returns an Ack packet. The Ack packet includes a UDP address 152.20.10.100:8000 prepared for receiving the RTP voice packet by the IP telephone apparatus 303 and a UDP port address 152.20.10.8 prepared for receiving the control channel RTCP packet. 100: 8001 is stored. The router 100 transmits this packet to the IP telephone apparatus 301 via the PANi / f101.
[0076]
The protocol analysis unit 108 analyzes the logical channel establishment request packet from the IP telephone apparatus 301 and extracts the following information.
・ Logical channel number,
·data type,
The transport address used by the media channel,
Transport address used by the media control channel
[0077]
With the above operation, preparations for transmitting RTP voice packets from IP telephone apparatus 301 to IP telephone apparatus 303 are completed. At the same time, predetermined information was extracted by the protocol analysis unit 108.
[0078]
On the other hand, a request for opening a logical channel (OpenLogicalChannel) for transmitting an RTP voice packet is transmitted from the IP telephone apparatus 303 at the transmission destination 152.20.10.50:1757. The transmission source of this packet is 192.168.2.2:1759.
[0079]
In this packet, the source UDP address 152.20.10.100:8001 used by the IP telephone apparatus 303 in the RTCP stream which is a control channel for the RTP voice packet is stored. The router 100 transmits the packet as it is to the IP telephone apparatus 301 via the PANi / f102.
[0080]
The protocol analysis unit 108 analyzes the logical channel establishment request packet from the IP telephone apparatus 301 and extracts the following information.
・ Logical channel number,
·data type,
Transport address used by the media control channel
[0081]
From the above data type, for example, the IP telephone apparatus 301 has an audio transmission / reception capability. It can be confirmed that encoding is performed with 711 μ-law.
[0082]
The IP telephone apparatus 301 receives the request packet and returns an Ack packet. The Ack packet includes a UDP address 192.168.2.2:49604 prepared for receiving the RTP voice packet by the IP telephone apparatus 301 and a UDP port address 192.168.2.2.1 prepared for receiving the control channel RTCP packet. 2: 49605 is stored. The router receives this packet, converts the source address to 152.20.10.50:49605, and transmits it to the IP telephone apparatus 303 via the LANi / f101.
[0083]
The protocol analysis unit 108 analyzes the logical channel establishment request packet from the IP telephone apparatus 301 and extracts the following information.
・ Logical channel number,
·data type,
The transport address used by the media channel,
Transport address used by the media control channel
[0084]
Furthermore, the arrival time of the packet is recorded. This time becomes the voice call start time of the line.
[0085]
With the above operation, preparation for transmitting an RTP voice packet from IP telephone apparatus 303 to IP telephone apparatus 301 is completed. At the same time, predetermined information was extracted by the protocol analysis unit 108.
[0086]
Now that the preparation for the two-way voice call is completed, the protocol analysis unit 108 transmits the information extracted so far to the call history creation unit 109. The call history creation unit 109 creates a call history based on the information received from the protocol analysis unit 108. The contents include the start time of the voice call from the IP telephone apparatus 301 to the IP telephone apparatus 303, the encoding rules of the voice used, the encoding capability of both terminals, and a display character string for indicating the terminal name to the user Including.
[0087]
Subsequently, a voice call using the RTP packet is started.
[0088]
An RTP voice packet is transmitted from the IP telephone apparatus 301 with a transmission source address 192.168.2.2:49604 and a transmission destination address 152.20.10.10.00: 8000. The packet is converted to a source address 152.20.10.50:49604 by the router and transmitted to the IP telephone apparatus 303, and the IP telephone apparatus 303 receives the address 152.20.10.50:49604.
[0089]
The protocol analysis unit 108 checks the source transport address 192.168.2.2:49604 and the destination transport address 152.20.10.100:8000 used by the media channel and matches the addresses. To be extracted from the address translation unit 106 and copied to the RTP packet storage unit 110.
[0090]
An RTP voice packet is transmitted from IP telephone apparatus 303 at transmission source address 152.20.10.100:8000 and transmission destination address 152.20.10.50:49604. The router converts the transmission destination address to 192.168.2.2:49604 and transmits the packet to the IP telephone apparatus 303. The IP telephone apparatus 303 receives the packet at the address 192.168.2.2:49604.
[0091]
The protocol analysis unit 108 checks the source transport address 152.20.10.100:8000 and the destination transport address 152.20.10.50:49604 used by the media channel and matches the addresses. To be extracted from the address translation unit 106 and copied to the RTP packet storage unit 110.
[0092]
When the user completes the call, H. A 245 session end command is transmitted. The protocol analysis unit 108 analyzes the packet and analyzes the H.264 protocol. Confirm the completion of the H.245 session. The entry used in the H.245 session is deleted. Further, the arrival time of the packet is recorded. This time is the end time of the voice call.
[0093]
At the same time, the protocol analysis unit 108 notifies the RTP packet storage unit 110 of the end of the voice call. The RTP packet storage unit 110 completes the storage of the voice packet and closes the file.
[0094]
Q. A 931 release command is transmitted. The protocol analysis unit 108 analyzes the packet and confirms the disconnection of the call. The entry used in the 225 (Q.931) session is deleted. Further, the arrival time of the packet is recorded. This time is the line disconnection time. Also, information is transmitted to the call history creating unit 109. The call history creation unit 109 records the end of the call and stores information related to the call in a file.
[0095]
With the above operation, the voice call is finished, and a call history related to the call is created in the call history creating unit 109 and stored in a file. The RTP packet storage unit 110 stores call contents in a file.
[0096]
In FIG. A connection sequence and a transport address to be transmitted when an IP videophone apparatus is connected in accordance with the H.323 standard are shown.
[0097]
SourceIP and SourcePort indicate transmission source information of a packet, and indicate a transmission source IP address and a TCP port number, respectively. MsgType is a Q.M. 931 or H.264. The message type used in the H.245 protocol, the M. 225 message or H.264 message. 245 message is shown.
[0098]
After the Data field, additional information transmitted along with the message is shown. The Net field and the subsequent Port field are H.264. The IP address and TCP port number for waiting to receive the H.245 control channel are shown. The FL CN field indicates a logical channel number used for transmission or reception of media data. The MC Net and MC Port fields indicate the IP address and UDP port number that are waiting to receive the media channel. The MMC Net and MCC Port fields indicate the IP address and UDP port number that are waiting to receive the media control channel.
[0099]
Here, from the machine with the IP address 192.168.2.2 to the machine with 152.20.10.10. An example in which a H.323 call is made is shown.
[0100]
Hereinafter, further details will be described.
The first thing that happens is call connection. Q. 931 / H. A call connection (Setup) message is transmitted according to the H.225 standard.
[0101]
The called terminal waits for reception at the TCP port number 1720 defined by the standard. When the Setup message is received, a CallProc message indicating that the reception process is in progress is sent back to the port number 1757 of 192.168.2.2 which is the transmission source address of the packet.
[0102]
Subsequently, the called terminal receives the H.264 message from the terminal user. In order to indicate that the H.323 connection request has arrived, for example, processing such as ringing a call bell is performed, and an alerting message is returned. When the receiving user accepts the connection, a Connect message is returned to complete the call connection.
[0103]
The Connect message includes an H.264 message used by the receiving side in the next phase. 245 channel address information is stored. In this example, the IP address is 152.20.10.100 and the TCP port number is 1025.
[0104]
The calling side terminal newly uses the TCP port 1025 to newly establish H.264. 245 channel is opened, and H.264 between the caller and callee Exchange according to the H.245 standard is performed. That is, H.I. 245 requests and H.264 requests. Based on the H.245 response, master / slave determination and terminal capability exchange are performed.
[0105]
If it is confirmed by the terminal capability exchange that the terminals have the necessary audio capability and video capability, the process proceeds to the phase of opening the audio transmission channel and the video transmission channel. A channel for transmitting the media data is called a logical channel, and a UDP port is used. For example, in the video transmission channel establishment request, the media type and the logical channel number are designated in the data portion of the OpenLogicalChannel message to specify the H.264 format. Send a 245 request. For example, Video is specified as the media type, and 258 is specified as the logical channel number.
[0106]
On the other hand, the receiving side confirms the establishment of the video channel, and sends an OpenLogicalChannelAck message to H.264. It is stored in the H.245 response and returned to the sender. This message is accompanied by three pieces of information. The first information is a logical channel number indicating which channel opening request is a confirmation message. In this case, the number is 258. The second information is an address of a media channel that receives media data. In this example, video is received at an IP address of 152.20.10.10.00 UDP port number 8002. The last information is a reception address of a media control channel that performs media channel flow control. In this example, the IP address is 152.20.10.10.00 UDP port number 8003.
[0107]
In one media channel, only one type of media data is transmitted in one direction. Accordingly, four logical channels are opened to transmit and receive video and audio to and from each other. On the other hand, in one media control channel, control related to bidirectional communication is performed for only one type of media data. Therefore, two channels are opened for video control and audio control. The call starts when all channels are open.
[0108]
When the user ends the call, the terminal of the terminal that has ended the call A session end (EndSession) message indicating the end of the call is transmitted by the 245 command, and both terminals terminate the transmission and reception of media data. Here, the call is disconnected from the terminal side of the IP address 192.168.2.2. H. When the H.245 channel is disconnected, Q. 931 standard release complete (Release Complete) messages are sent to each other and the call is disconnected.
[0109]
FIG. 4 is a diagram illustrating an example of information related to a terminal among information created by the call history creation unit 109.
[0110]
One piece of terminal information is created for each terminal, and is not changed if the information is the same even if the same terminal makes a call several times. If the information is different, it is updated to the latest information. In the illustrated example, two pieces of terminal information of the IP telephone device 301 (192.168.2.2) and the IP telephone device 303 (152.20.10.100) are recorded. The terminal information includes an address, an alias, a terminal type, and capability information as illustrated. For example, an alias address “Taro” is recorded in the IP telephone device 301, and an alias address “Hanako” is recorded in the IP phone device 303.
[0111]
FIG. 5 is a diagram illustrating an example of call history information created by the call history creating unit 109.
[0112]
Call history information is created for each call. In the illustrated example, a history of voice call and video transmission / reception from the IP telephone apparatus 301 to the IP telephone apparatus 303 is recorded. According to this history, G. 711 μ Law coding rules are used, and H.264 is used for video transmission and reception. It can be seen that CIF is used for the H.263 encoding rule and the video size.
[0113]
By the way, the stream data conversion unit 111 reads the RTP voice packet stored in the RTP packet storage unit 110, and once reproduces the voice packet transmitted by the IP telephone device 301 and the voice packet transmitted by the IP telephone device 303. Stereo format with voice data from the telephone device 301, voice data from the IP phone device 303, voice of the IP telephone device 301 as the calling side as the right channel, and voice of the IP phone device 303 as the called side as the left channel The audio data is re-encoded in three ways and stored in files. For example, MP3 is used for encoding each audio data.
[0114]
FIG. 6 is a diagram illustrating a configuration related to the audio data conversion processing in the stream data conversion unit 111.
[0115]
In the case where encoding is performed using stereo voices in which the calling side and called side voices are separate channels, the switch (SW) 501 and the switch 502 are turned on, and the switch 503 and the switch 504 are turned off. G. The outgoing voice packet that has been encoded with 711 is input to the decoder 505 via the switch 501, decoded there, and input to the right channel of the MP3 encoder 507. G. The incoming voice packet subjected to 711 encoding is input to the decoder 506 via the switch 502, decoded there, and input to the left channel of the MP3 encoder 507. Then, it is compression encoded by the MP3 encoder 507, and a stereo audio encoded packet is output.
[0116]
In the case of outputting only the outgoing side voice, the switches 501 and 503 are turned on, and the switches 502 and 504 are turned off. G. The 711-encoded outgoing voice packet is decoded by the decoder 505 and input to both the right channel and the left channel of the MP3 encoder 507. Then, it is compression encoded by the MP3 encoder 507, and stereo audio encoded packets having the same output are output in the left and right channels.
[0117]
When only the incoming call side voice is output, the switch 502 and the switch 504 are turned on, and the switch 501 and the switch 503 are turned off. G. The incoming side voice packet subjected to 711 encoding is decoded by the decoder 505 and input to both the right channel and the left channel of the MP3 encoder 507. Then, it is compression encoded by the MP3 encoder 507, and stereo audio encoded packets having the same output are output in the left and right channels.
[0118]
Furthermore, the stream data conversion unit 111 reads the RTP video packet stored in the RTP packet storage unit 110, and plays back the video packet transmitted from the IP telephone device 301 and the video packet transmitted from the IP telephone device 303, respectively. , And converted into an encoding format that can be displayed by a WWW browser. For example, MPEG1, which is generally used, is used for this encoding format. The videos sent by both parties are saved as separate files.
[0119]
Further, the following three types of composite data are created by combining the created three types of audio data and the created two types of video data. That is,
(1) A data file combining video and audio from the IP telephone device 301 (calling side),
(2) A data file combining video and audio from the IP telephone device 303 (calling side),
(3) a data file in which stereo audio using audio from the IP telephone apparatus 301 and audio from the IP telephone apparatus 303 as separate channels and video from the IP telephone apparatus 301 are combined;
(4) A data file in which stereo audio using audio from the IP telephone device 301 and audio from the IP telephone device 303 as separate channels and video from the IP telephone device 303 are combined.
Create
[0120]
In this way, a call or video transmission / reception by IP videophone can be recorded with a simple configuration. Further, since the recording function of these calls or video transmission / reception is realized by the router, the recording function can be shared by a plurality of videophone terminals and IP telephone terminals used by the user.
[0121]
Next, a call history confirmation process in the embodiment will be described.
[0122]
The XML data creation unit 112 creates WWW page data that displays the call history created by the call history creation unit 112 and the link to the audio data and video data created by the stream data conversion unit 111, and stores them in a file. . Thereafter, the WWW server unit 113 is notified of the page update.
[0123]
The WWW server unit 113 receives a page update notification from the XML data creation unit 112, reads the page data, and publishes the updated page to the network.
[0124]
When a WWW server published by the router 100 is accessed from a WWW browser of the PC 302 in the PAN, a page created by the XML data creation unit 112 is displayed, and a call history can be confirmed.
[0125]
FIG. 7 is a diagram illustrating an example of a call history display screen displayed by the WWW browser of the PC 302.
[0126]
In the illustrated example, the call history for two days, June 30, 2002 and July 1, the same year is displayed. The call history is displayed on the screen in page units without scrolling. When the “Previous page” button 71 is clicked with, for example, a mouse, the history of the day before June 30, 2002 is displayed, and when the “Next page” button 72 is clicked, the history after July 1 of the same year is displayed. When the “play” link display 73 is clicked, a corresponding playback stream selection screen is displayed, and when the “detail” link display 74 is clicked, detailed information of the corresponding call is displayed.
[0127]
FIG. 8 is a diagram showing an example of a playback stream selection screen.
[0128]
Clicking on the “sound only playback” link display 81 separates the voices of the calling side (IP telephone device 301) and the called side (IP telephone device 303) created by the stream data converter 111 as described above. Stereo audio for the channel is played.
[0129]
When the “play only on caller side” link display 82 is clicked, a stream consisting of video and audio from the IP telephone device 301 is transmitted and played back by the browser. A stream consisting of video and audio from the device 303 is transmitted and reproduced by the browser.
[0130]
When the “caller-side video and both audio playback” link display 84 is clicked, stereo audio using the audio from the IP telephone device 301 and the audio from the IP telephone device 303 as separate channels, and the video from the IP telephone device 301, respectively. A stream with a data file that is combined with is sent and played back by the browser.
[0131]
Also, when the “calling side video and both audio playback” link display 85 is clicked, stereo audio using the audio from the IP telephone device 301 and the audio from the IP telephone device 303 as separate channels, and the video from the IP telephone device 303, respectively. A stream with a data file that is combined with is sent and played back by the browser.
[0132]
When the “play all” link display 86 is clicked, the video from the IP telephone device 301 and the video from the IP telephone device 303 are transmitted as independent video streams, and the audio from the IP telephone device 301 and the IP telephone device are transmitted. A stream of stereo audio using the audio from 303 as separate channels is transmitted and reproduced by the browser.
[0133]
For playback of audio and video stream data in a general browser, programs such as Windows (registered trademark) Media Player provided by Microsoft and RealPlayer provided by Real Networks are installed on the PC. This can be done automatically. According to these programs, it is possible to perform so-called streaming reproduction in which reproduction is performed while transferring data without downloading. Of course, playback may be performed after all the downloads have been completed.
[0134]
FIG. 9 is a diagram illustrating an example of a detailed call information display screen.
[0135]
When a “return” button 91 is clicked, the screen returns to the previous call history screen of FIG. When the terminal ID display is clicked, detailed information regarding the corresponding terminal as shown in FIG. 10 is displayed.
[0136]
FIG. 10 is a diagram illustrating a display example of detailed information regarding the terminal having the terminal identifier 0002. When the “return” button 95 is clicked, the previous screen of FIG. 9 is restored. When the “history extraction” display 96 is clicked, a call related to the currently selected terminal (identifier 0002) is extracted from the history, and call history information as shown in FIG. 11 is displayed.
[0137]
FIG. 11 is a diagram illustrating an example of a call history display screen of the terminal 0002.
[0138]
Here, two days of June 30, 2002 and July 1, the same year are displayed on the screen. When the “Previous page” button 1101 is clicked, the extracted history on the day before June 30, 2002 is displayed, and when the “Next page” button 1102 is pressed, the extracted history after July 1, 2002 is displayed. Is displayed. When a “return” button 1103 is clicked, the screen returns to the screen of FIG. 10 which is the terminal information display screen. The operations when the “reproduction” link display 1104 and the “details” link display 1105 are clicked are the same as those in the screen of FIG.
[0139]
According to the embodiment described above, it is possible to automatically record an IP telephone call and to create and save a call history without changing the setting of the IP telephone apparatus connected to the private area network (PAN). it can. The content of the call can be saved regardless of which terminal is connected to the PAN and the IP telephone is called from any terminal.
[0140]
Further, the stored call history can be confirmed from the browser, and the recorded voice can be reproduced. Furthermore, by reproducing the voice on the calling side and the voice on the receiving side through different channels on the left and right sides, it is possible to perform clear reproduction with a sense of realism without mixing the voices of both.
[0141]
In the above-described embodiment, a WWW browser is used as means for confirming a saved call history. In general, HTTP (Hypertext Transfer Protocol) is used for data communication between a WWW server and a WWW browser, but the present invention is not limited to this. For example, the content of the call history may be confirmed using FTP (File Transfer Protocol).
[0142]
(Other embodiments)
The embodiment of the present invention has been described in detail above. However, the present invention can take an embodiment as a system, apparatus, method, program, storage medium, or the like. In addition, the present invention may be applied to a system composed of a plurality of devices, or may be applied to an apparatus composed of a single device.
[0143]
In the present invention, a software program that realizes the functions of the above-described embodiments is directly or remotely supplied to a system or apparatus, and the computer of the system or apparatus reads and executes the supplied program code. Including the case where it is also achieved by. In that case, as long as it has the function of a program, the form does not need to be a program.
[0144]
Accordingly, since the functions of the present invention are implemented by computer, the program code installed in the computer also implements the present invention. That is, the scope of the claims of the present invention includes the computer program itself for realizing the functional processing of the present invention.
[0145]
In this case, the program may be in any form as long as it has a program function, such as an object code, a program executed by an interpreter, or script data supplied to the OS.
[0146]
As a recording medium for supplying the program, for example, flexible disk, hard disk, optical disk, magneto-optical disk, MO, CD-ROM, CD-R, CD-RW, magnetic tape, nonvolatile memory card, ROM, DVD (DVD-ROM, DVD-R).
[0147]
As another program supply method, a client computer browser is used to connect to an Internet homepage, and the computer program itself of the present invention or a compressed file including an automatic installation function is downloaded from the homepage to a recording medium such as a hard disk. Can also be supplied. It can also be realized by dividing the program code constituting the program of the present invention into a plurality of files and downloading each file from a different homepage. That is, a WWW server that allows a plurality of users to download a program file for realizing the functional processing of the present invention on a computer is also included in the claims of the present invention.
[0148]
In addition, the program of the present invention is encrypted, stored in a storage medium such as a CD-ROM, distributed to users, and key information for decryption is downloaded from a homepage via the Internet to users who have cleared predetermined conditions. It is also possible to execute the encrypted program by using the key information and install the program on a computer.
[0149]
In addition to the functions of the above-described embodiments being realized by the computer executing the read program, the OS running on the computer based on the instruction of the program is a part of the actual processing. Alternatively, the functions of the above-described embodiment can be realized by performing all of them and performing the processing.
[0150]
Furthermore, after the program read from the recording medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, the function expansion board or The CPU or the like provided in the function expansion unit performs part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing.
[0151]
【The invention's effect】
According to the present invention, a recording function or a recording function with a simple configuration is provided for a videophone terminal or an IP telephone terminal that is used by a general user at home or introduced on a small scale in a company internal LAN. be able to.
[0152]
Further, according to the present invention, it is possible to provide a recording function and a recording function that can be shared by a plurality of videophone terminals and IP telephone terminals used by the user.
[0153]
Furthermore, according to the present invention, it is possible to provide a simple method for confirming and reproducing a recorded or recorded call image or call voice.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of a router according to an embodiment.
FIG. 2 is a diagram illustrating a configuration of a communication system including a router in the embodiment.
FIG. It is a figure which shows the connection sequence when the IP video telephone apparatus is connected according to H.323 standard, and the transport address transmitted.
FIG. 4 is a diagram illustrating an example of terminal information stored in a call history.
FIG. 5 is a diagram illustrating an example of call information stored in a call history.
FIG. 6 is a diagram illustrating a configuration related to audio data conversion processing in a stream data conversion unit.
FIG. 7 is a diagram showing an example of a call history display screen.
FIG. 8 is a diagram showing an example of a playback stream selection screen.
FIG. 9 is a diagram showing an example of a detailed call information display screen.
FIG. 10 is a diagram illustrating a display example of detailed information regarding a predetermined terminal.
FIG. 11 is a diagram showing an example of a call history display screen.
FIG. 12 is a diagram showing a configuration of a conventional router.
FIG. 13 shows H.264 using a conventional router. It is a figure which shows the structure of a H.323 communication system.

Claims (9)

A router that connects networks to each other and relays IP packets to a destination,
History creating means for creating history information of communication by the IP communication device in the network;
Storing means for storing at least one of audio and video from the IP communication apparatus. 2. The router according to claim 1, further comprising providing means for providing a user with history information created by the history creating means and at least one of audio and video accumulated by the accumulation means. 3. The router according to claim 2, wherein the providing unit includes a data conversion unit that converts at least one of audio and video stored by the storage unit into data for streaming. 4. The data conversion means includes: first voice data in which the voice stored in the storage means is different from the voice on the calling side and the voice on the called side; second voice data only on the calling side; 4. The router according to claim 3, wherein the router converts each of them into third voice data only for the called side. 5. The data conversion unit according to claim 4, wherein the data conversion unit further converts the video stored by the storage unit into video data on the calling side and video data on the called side in a predetermined format. Router. The said data conversion means produces the composite data which combined the audio | speech data in any one of the said 1st, 2nd, 3rd audio | speech data, and the said corresponding video data. Router. The said provision means includes page data creation means for creating page data for displaying the history information and a link to the streaming data corresponding to the history. Router. A method for controlling a router that interconnects networks and relays IP packets to a destination,
A history creation step of creating history information of communication by the IP communication device in the network;
And a storage step of storing at least one of audio and video from the IP communication device in a predetermined storage means. A program for connecting routers to each other and controlling routers that relay IP packets to destinations.
A history creation step of creating history information of communication by the IP communication device in the network;
A program for executing a storage step of storing at least one of audio and video from the IP communication device in a predetermined storage unit.

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