JP5459378B2 - Call log storage device and layer 3 network transfer device - Google Patents

Description

  The present invention relates to a communication technique, and more particularly to a communication technique capable of storing a telephone communication IP packet flowing on an IP (Internet Protocol) network for each outgoing call.

  VoIP (Voice over Internet Protocol) technology that realizes voice communication using an IP (Internet Protocol) network is becoming widespread. A voice call based on VoIP uses the same IP network as that for data communication, and therefore costs less than a voice call using an analog call network such as PSTN (Public Switched Telephone Network). Also, in recent years, by improving the performance of network communication devices and assigning telephone numbers to network communication devices, not only between communication devices that are clients of IP networks but also between communication devices on IP networks and analog telephones. You can also. In such a background, companies and the like are proceeding to unify voice communication and data communication through an IP network.

  VoIP telephone communication normally uses two protocols, SIP (Session Initiation Protocol) and RTP (Real-time Transport Protocol). SIP is for starting / changing / ending telephone communication, and RTP is for transmitting voice data.

  Conventionally, in a call center or the like, contents of a call with a user are stored. Businesses also record the contents of calls to confirm the contents of telephone calls by employees and to prevent the use of telephones for private use. This is also necessary in the case of telephone communication using an IP network, and various methods have been proposed.

For example, Patent Document 1 discloses a system that records a voice packet when a voice packet is transferred from a calling telephone to a called telephone.
Patent Document 2 analyzes an IP packet and determines whether the IP packet is a voice communication packet from the media type information recorded in the SIP after the IP header. In some cases, a system for extracting and recording audio data is disclosed.

JP 2006-100999 A JP 2006-54651 A

  When recording the content of a call, a method of recording a telephone number and the content of the call in association with each other is used to determine the caller. By the way, in the case of telephone communication using an IP network, the identification of a telephone number has the following problems.

  In VoIP telephone communication, data indicating a telephone number (hereinafter referred to as telephone number data) is stored in a SIP packet used for establishment or termination of a telephone call, but RTP for transmitting actual telephone call contents (voice data). The phone number data is not stored in the packet. For this reason, in order to record voice data, which is the content of a call between IP telephones, for each telephone number, it is necessary to inquire each time a device that manages the correspondence between the IP address and the telephone number, for example, a SIP server. This causes a problem that the recording process takes time and the network load increases.

  In a call system in which an analog call network such as PSTN and an IP network are mixed, a relay device that relays a call between the analog call network and the IP network, for example, a VoIP GW ( Gateway). The VoIP GW is provided at the boundary between the analog call network and the IP network, converts analog voice data received from the analog call network into digital data, further divides it into IP packets, and transmits to the IP network. Also, the IP packet received from the IP network is restored to analog voice data and output to the analog call network. In addition, the VoIP GW also compresses and decompresses digital audio data.

  When the VoIP GW generates an IP packet from analog voice data from the analog call network, an IP header or the like storing the IP address of the transmission source is added to the payload that is digital voice data. The VoIP GW uses its own IP address as this IP address. Therefore, the source IP address of the IP packet transmitted from the analog call network to the IP network becomes the IP address of the VoIP GW that generated the IP packet. On the IP network side, when the voice data of this IP packet is recorded, the telephone number of the utterance source cannot be determined.

  The present invention has been made in view of the above circumstances, and provides a technique for easily determining the telephone number of the utterance source of the telephone communication IP packet flowing on the IP network and improving the efficiency of the process of recording the contents of the call. To do.

  One aspect of the present invention is a communication device. When generating a telephone communication IP packet to be transmitted to an IP (Internet Protocol) network, the communication apparatus includes an IP packet generation unit that embeds the telephone number data of the utterance source in the transmission source address area of the IP header of the IP packet. .

  Another aspect of the present invention is a call log storage device. The call log storage device extracts the telephone number data of the utterance source from the IP header of the telephone communication IP packet in which the telephone number data of the utterance source is embedded in the transmission source address area of the IP header flowing on the IP network, The voice data included in the telephone communication IP packet is stored for each telephone number indicated by the extracted telephone number data.

Yet another aspect of the present invention is a layer 3 network transfer apparatus. The transfer apparatus transmits an IP packet in which an identifier indicating that the IP packet is a telephone communication IP packet is embedded in a source address area of an IP header among IP packets flowing on the IP network. Transfer to the call log storage device.
It should be noted that combinations of the elements of the above-described aspects, and those obtained by replacing the devices of the above-described aspects as systems, methods, and programs are also effective as aspects of the present invention.

  According to the technology of the present invention, the telephone number of the utterance source of the telephone communication IP packet flowing on the IP network can be easily determined, and the efficiency of the process of recording the contents of the call can be improved.

It is a schematic diagram which shows the communication apparatus for demonstrating the principle of the technique concerning this invention (the 1). FIG. 3 is a diagram for explaining processing of generating a transmission source address by the communication apparatus shown in FIG. 1 (No. 1). FIG. 3 is a diagram for explaining a process of generating a transmission source address by the communication apparatus shown in FIG. 1 (part 2). It is a schematic diagram which shows the communication apparatus for demonstrating the principle of the technique concerning this invention (the 2). It is a figure which shows the telephone call system concerning embodiment of this invention. It is a figure which shows VoIP GW shown in FIG. It is a figure for demonstrating the process which the VoIP GW shown in FIG. 6 produces | generates an IPv6 address. It is a flowchart which shows the process relevant to the VoIP GW shown in FIG. 6 producing | generating an IPv6 address. It is a flowchart which shows the process relevant to the VoIP GW shown in FIG. 6 converting the audio | voice data from an analog telephone into an IP packet, and transmitting. It is a figure for demonstrating the process in which the call log preservation | save server in the call system shown in FIG. 5 extracts a telephone number from an IP header. It is a figure which shows the aspect of the other IPv6 address. It is a figure for demonstrating the process which extracts a telephone number from the IPv6 address shown in FIG.

  Before describing specific embodiments of the present invention, the principle of the present invention will be described first. In addition, each element described as a functional block for performing various processes in the drawings used in the following description can be configured by a CPU, a memory, and other LSIs in terms of hardware, and in terms of software. It is realized by a program recorded in a memory or loaded. Therefore, it is understood by those skilled in the art that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof, and is not limited to any one. Also, for the sake of clarity, only those necessary for explaining the technique of the present invention are shown in these drawings.

  FIG. 1 shows a communication device 10 according to the technique of the present invention. The communication device 10 is connected to the IP network 15 as a client of the IP network 15 and includes an IP packet generation unit 11.

  The communication device 10 is, for example, an IP telephone, and realizes voice communication by converting voice data into an IP packet and sending it to the IP network 15. The IP packet generation unit 11 converts voice data into an IP packet. At the time of this conversion, the telephone number data of the communication device 10 is embedded in the transmission source address area of the IP header of the IP packet. Here, as an example, the format of the source address in the header of the IP packet created by the IP packet generator 11 compliant with IPv6 is shown.

  In IPv6, the network address is represented by 128 bits. The first 64 bits are called a network prefix (hereinafter referred to as PrefixID), and the latter 64 bits are called an interface ID (hereinafter referred to as IFID). As shown in FIG. 2, the IP packet generator 11 embeds the telephone number data of the communication device 10 in the source address area in the IP header, more specifically in the IFID area. This telephone number data includes a country code and a telephone number, for example, It is obtained by converting to 164 system.

  When a telephone communication IP packet having an IP header having such a transmission source address is transmitted to the IP network 15 by the communication apparatus 10, the communication apparatus that has received the packet determines the telephone number of the utterance source from the IP header. can do. Furthermore, when the receiving side determines whether the IP packet is a data communication IP packet or a telephone communication IP packet, the data format of the source address area (IFID area in the example shown in FIG. 2) of the IP header is used. However, it is possible to determine that the IP packet is a telephone communication IP packet on the condition that the transmission side has a format (for example, the E.164 system described above) determined when converting the telephone number data.

  That is, in the IP layer which is the network layer, it is possible to determine whether the IP packet is a telephone communication IP packet and to determine the telephone number.

  Further, when the telephone number data is embedded by the IP packet generator 11, it is preferable to embed an identifier (for example, communication type number: 5) indicating that the IP packet is a data packet for telephone communication. FIG. 3 shows an example of the data format of the source address area in this case. In the illustrated example, there is an 8-bit identifier at the head of the IFID area, followed by telephone number data consisting of 16 bits of the country code and 40 bits of the telephone number.

  When a telephone communication IP packet with an IP header having a source address as shown in FIG. 3 is output to the IP network 15, a routing device such as a router determines that the IP packet is an IP packet for telephone communication from the IP header. Therefore, the routing device can be set so as to transfer not only to the communication device of the transmission destination address but also to the storage device for storing the call contents provided on the IP network 15. By doing so, the storage device does not need to design the system to receive all packets, and the load on the network can be reduced.

  FIG. 4 shows another communication device 20 according to the technique of the present invention. The communication device 20 is connected to the IP network 25 and the analog call network 26 and relays a call between the IP network 25 and the analog call network 26. For example, in the case of VoIP, the communication device 20 is a VoIP GW.

  The communication device 20 converts analog voice data from the analog call network 26 into digital, further divides it into IP packets, and transmits them to the IP network 25. The IP packet generation unit 21 generates the IP packet. When generating an IP packet to be transmitted to the IP network 25, the IP packet generation unit 21 embeds the data of the telephone number of the utterance analog telephone in the source address area of the IP header. The format of the data of the source address area generated by the IP packet generator 21 can be the same as that generated by the IP packet generator 11 in the communication apparatus 10 shown in FIG. Omitted. In addition to the telephone number data of the utterance source analog telephone, the identifier indicating the IP packet for telephone communication is embedded in the same manner as the IP packet generator 11.

  The communication device 20 can achieve the same effect as that of the communication device 10 even in a call system in which an analog call network and an IP network are mixed.

  The technology according to the present invention can be effectively used in a system for storing the contents of a telephone communication call using an IP network. This will be described using the following embodiment.

  FIG. 5 shows a call system 100 according to an embodiment of the present invention. The call system 100 includes a PSTN 220 serving as an analog call network and a corporate network 400. A plurality of (two in the illustrated example) analog telephones 200 are connected to the PSTN 220, and the corporate network 400 includes an intra-corporate network 420. A VoIP GW 300 is connected between the PSTN 220 and the corporate network 420, and a call is relayed by the VoIP GW 300. The router 410 is a layer 3 relay device and transfers IP packets flowing on the corporate network 420. A plurality of (two in the illustrated example) IP telephones 430 and a call log storage server 440 for storing call contents are connected to the in-company network 420. The call system 100 according to the present embodiment implements a call using an IP network by VoIP technology. In the following description and illustration, an ordinary SIP server such as a SIP server for realizing a call by VoIP is used. The configuration used for the VoIP technology and not directly related to the gist of the present invention will be omitted.

  A call between the analog telephones 200 is performed via the PSTN 220. A call between the IP telephones 430 is performed via the corporate network 420. A call between the analog telephone 200 and the IP telephone 430 is relayed between the PSTN 220 and the corporate network 420 by the VoIP GW 300.

  FIG. 6 shows the VoIP GW 300. The VoIP GW 300 includes a relay function 310 and an address processing function 320. The relay function 310 is performed by the analog voice data transmission / reception IF 311, the voice / packet conversion unit 312, the source address selection unit 313, and the IP packet transmission / reception IF 314. The address processing function 320 is performed by the transmission source address generation unit 321 and the transmission source address setting unit 322.

  The analog voice data transmission / reception IF 311 receives the analog voice data transmitted from the analog telephone 200 via the PSTN 220 when speaking from the analog telephone 200 to the IP telephone 430, and receives the voice / packet conversion unit 312 and the source address generation unit. It outputs to 321. Further, when the IP telephone 430 speaks to the analog telephone 200, the analog voice data obtained by the voice / packet conversion unit 312 is output to the PSTN 220.

  The voice / packet conversion unit 312 converts the analog voice data from the analog voice data transmission / reception IF 311 into digital data when speaking from the analog telephone 200 to the IP telephone 430, and further divides the packet into packets to be a source address selection unit 313. Output to. Further, when speaking from the IP telephone 430 to the analog telephone 200, the packet from the transmission source address selection unit 313 is restored to voice data, further converted to analog voice data, and output to the analog voice data transmission / reception IF 311.

  The source address selection unit 313 stores the telephone number and the IPv6 address in association with each analog telephone 200 that speaks, and the analog telephone that speaks when the analog telephone 200 speaks to the IP telephone 430. The IPv6 address corresponding to the 200 telephone number is selected as the source address of the IP packet from the source address selection unit 313. Note that the IPv6 address is generated by the transmission source address generation unit 321, and details thereof will be described later. When the IP telephone 430 speaks to the analog telephone 200, the IP packet from the IP packet transmission / reception IF 314 is transferred to the voice / packet conversion unit 312.

  The IP packet transmission / reception IF 314 uses the transmission source address selected by the transmission source address selection unit 313 when speaking from the analog telephone 200 to the IP telephone 430 as the transmission source address in the IP header of the packet from the voice / packet conversion unit 312. It is embedded in the area and output to the corporate network 420. Further, when the IP telephone 430 speaks to the analog telephone 200, the IP packet from the corporate network 420 is output to the source address selection unit 313 that has received it.

  The transmission source address generation unit 321 and the transmission source address setting unit 322, when speaking from the analog telephone 200 to the IP telephone 430, still store the IPv6 address corresponding to the telephone number of the analog telephone 200 in the transmission source address selection unit 313. Works if not. Specifically, the transmission source address generation unit 321 generates a transmission source address, that is, the above-described IPv6 address based on the telephone number of the analog voice data received from the analog voice data transmission / reception IF 311, and sends it to the transmission source address setting unit 322. Output. The transmission source address setting unit 322 outputs the IPv6 address to the transmission source address selection unit 313 and sets the generated IPv6 address as the transmission source address to the IP packet transmission / reception IF 314.

  Here, details of the IPv6 address will be described while explaining address generation processing by the source address generation unit 321. In this embodiment, as an example, a pTLA address compliant with IPv6 is used as the address of an IP packet.

  The transmission source address generation unit 321 first converts this telephone number to E.E. Converted to the 164 number system Get the 164 number. E. The 164 number is an E.264 standard that defines an internationally unique telephone number system by ITU-T (International Telecommunication Union / Telecommunication Standardization Sector). This is an international public telecommunication number defined in the 164 recommendation, and is represented by a decimal string of up to 15 digits including a country code. For example, if the telephone number of the analog telephone 200 that speaks is 03-444-5555, the E.D. The 164 number is “+ 81-3-5297-2311”. The transmission source address generation unit 321 includes E.E. In addition to the telephone number converted into the 164 number, a communication type identifier “5” indicating that the IP packet is telephone communication is stored in the IFID area in the source address area of the IP header to generate an IPv6 address. The source address area has 128 bits, the prefix 64 bits store PrefixID, and the latter 64 bits store IFID. In the present embodiment, the source address generation unit 321 stores a communication classifier (also simply referred to as an identifier) in the first 8 bits of the IFID area, stores the country code in the 16 bits following the identifier, and the last 40 bits. The phone number after the country code is stored. For example, when the PrefixID is 3ffe: 302: 1, the IPv6 address generated as the transmission source address based on 03-4444-5555 is “3ffe: 302: 1 :: 551: 3: 115c: 15b3”. .

  The IPv6 address generated in this way is output to the source address selection unit 313 and set for the IP packet transmission / reception IF 314. The transmission source address selection unit 313 stores the telephone number in association with the telephone number. Next, when an utterance is made from the analog telephone 200 having the telephone number to the IP telephone 430, the transmission source address selection unit 313 selects the transmission source address as the IP address Used for packet transmission / reception IF 314.

  FIG. 8 is a flowchart showing processing related to the VoIP GW 300 setting a source address. As shown in the figure, when speaking from the analog telephone 200 to any of the IP telephones 430 (S10), the analog voice data transmission / reception IF 311 in the VoIP GW 300 receives the analog voice data from the analog telephone 200 via the PSTN 220. Then, the telephone number of the analog telephone 200 that has output the analog voice data is notified to the transmission source address generation unit 321 to request generation and setting of the transmission source address (S12). The transmission source address generation unit 321 generates an IPv6 address based on the telephone number from the analog voice data transmission / reception IF 311 and outputs the IPv6 address to the transmission source address setting unit 322 to request setting (S14). The transmission source address setting unit 322 sets the IPv6 address from the transmission source address generation unit 321 in the IP packet transmission / reception IF 314 (S16), and notifies the transmission source address selection unit 313 (S20). The IP packet transmission / reception IF 314 adds the IPv6 address set by the transmission source address setting unit 322 to the header of the IP packet as a transmission source address (S18). The source address selection unit 313 adds the IPv6 address notified from the source address setting unit 322 to the list in association with the telephone number of the analog telephone 200 (S22).

  FIG. 9 is a flowchart showing processing related to the VoIP GW 300 converting voice data from the analog telephone 200 into IP packets and outputting them. As shown in the figure, when speaking from the analog telephone 200 to any of the IP telephones 430 (S50), the analog voice data transmission / reception IF 311 in the VoIP GW 300 receives the analog voice data from the analog telephone 200 via the PSTN 220. Then, it is transferred to the voice / packet converter 312 (S52). The voice / packet conversion unit 312 converts the analog voice data into digital data, divides it into packet data, outputs the packet data to the transmission source address selection unit 313, and requests transmission (S54). The transmission source address selection unit 313 selects an IPv6 address corresponding to the telephone number of the analog telephone as a transmission source address from the stored list, outputs the packet data together with the packet data to the IP packet transmission / reception IF 314, and requests transmission (S56). ). The IP packet transmission / reception IF 314 adds the IPv6 address to the transmission area of the IP header and transmits it (S58).

  As described above, in the IP packet transmitted to the corporate network 420 via the VoIP GW 300, the IPv6 address corresponding to the telephone number of the analog telephone 200 of the utterance is embedded in the source address area in the IP header thereof. Yes.

  In addition to the same function as a normal IP phone, IP phone 430 embeds its own phone number data in the source address area in the IP header of the IP packet when speaking. Since this process by the IP telephone 430 is the same as the IPv6 address generation process by the VoIP GW 300 except that the telephone number of the own phone is used, detailed description thereof is omitted here. The source address generated by the IP telephone 430 is also referred to as an IPv6 address.

  That is, in the telephone communication IP packet flowing through the corporate network 420, the telephone number data of the utterance source is embedded in the transmission source address area. In the IP packet transmitted from the IP telephone 430, the telephone number data (IPv6 address) of the IP telephone 430 itself is embedded. In the IP packet transmitted from the VoIP GW 300 to the corporate network 420, the utterance source The telephone number data (IPv6 address) of the analog telephone 200 is embedded. Furthermore, an identifier indicating that the packet is a telephone communication IP packet is also embedded in the same source address area.

  The IP packet flowing on the corporate network 420 is transferred to the destination node by the router 410 which is a layer 3 relay device. Further, there may be another layer 3 relay device (for example, a router) or a layer 2 relay device (for example, a switching hub) between the router 410 and another node on the corporate network 420. . In such a case, the router 410 transfers the packet to the target node via these relay devices.

  The router 410 identifies whether the IP packet flowing on the corporate network 420 is a data communication IP packet or a telephone communication IP packet. The router 410 checks whether or not the first 8 bits of the IFID in the source address area of the IP packet are “5”, and if it is “5”, the IP packet is a telephone communication IP packet. Identify.

  The router 410 transfers the data communication IP packet to a node having a destination address included in the IP header. On the other hand, for the telephone communication IP packet, the router 410 transfers the node to the destination address included in the IP header of the IP packet and the call log storage server 440. That is, telephone communication IP packets out of IP packets flowing on the corporate network 420 are transferred to the call log storage server 440 in addition to the destination node (IP telephone 430 or VoIP GW 300).

  The IP telephone 430 receives the telephone communication IP packet transferred from the router 410 and performs call processing. Since this process is the same as that performed by a normal IP telephone, detailed description thereof is omitted here.

  The call log storage server 440 extracts the telephone number of the utterance source from the transmission source address area in the IP header of the telephone communication IP packet transferred from the router 410 and associates it with the payload portion (call contents) of the IP packet. And save.

  FIG. 10 is a diagram for explaining processing in which the call log storage server 440 extracts a telephone number. As shown in the figure, the call log storage server 440 first obtains a telephone number from the source address area in the IP header of the telephone communication IP packet transferred from the router 410, more precisely, the area from the 9th bit of the IFID area. Extract. This telephone number includes the country code. For example, “+ 81-3-5297-2311” in the illustrated example. The call log storage server 440 extracts the extracted E.P. The phone number “03-4444-5555” is obtained by further converting the 164 number. The call log storage server 440 stores the telephone number and the payload portion of the IP packet in association with each other. That is, the call log storage server 440 stores the call contents for each telephone number of the utterance source.

  As described above, in the present embodiment, each IP telephone 430 and VoIP GW 300 transmits the telephone number data of the utterance source to the transmission source address area of the IP header when transmitting the telephone communication IP packet to the corporate network 420. Send it embedded. By doing so, the call log storage server 440 can extract the telephone number of the utterance source from the transmission source address area of the IP header, and can store the call contents for each telephone number. For IP packets sent from the IP telephone 430, the telephone number can be acquired without making an inquiry to the SIP server, and the IP packet obtained by converting the analog voice data from the analog telephone 200 can be obtained from the utterance source. The telephone number of the analog telephone 200 can be acquired.

  Further, in the present embodiment, each IP telephone 430 and VoIP GW 300 embeds an identifier indicating that the IP packet is a telephone communication IP packet in the source address area of the IP header. By doing so, the router 410 can identify whether or not the IP packet is a telephone communication IP packet based on the IP header. If the IP packet is a telephone communication IP packet, the router 410 also transmits it to the call log storage server 440. Forward. By doing so, the call log storage server 440 does not need to receive all IP packets of the corporate network 420, and the load on the network is reduced. Furthermore, since it is possible to identify whether an IP packet is a telephone communication IP packet only by referring to the IP header, it can be realized by a call content storage IP layer, and it is necessary to analyze the IP packet as in Patent Document 2. There is no.

  The present invention has been described above based on the embodiment. The embodiment is an exemplification, and various changes and increases / decreases may be added without departing from the gist of the present invention. It will be understood by those skilled in the art that modifications to which these changes and increases / decreases are also within the scope of the present invention.

  For example, in the call system 100, a communication type identifier indicating that the IP packet is a telephone communication IP packet is embedded in the IPv6 address embedded in the source address area of the IP packet transmitted to the corporate network 420. This identifier need not be embedded. In this case, the call log storage server 440 receives all IP packets flowing on the corporate network 420, and the call log storage server 440 stores the IFID data in the source address area in the IP header of the received IP packet. A predetermined method such as E.I. Whether the IP packet is a telephony IP packet may be identified based on whether it is a 164 system.

  In this case, as shown in FIG. 11, the data format in the transmission source address area is such that the country code is stored in the first 16 bits of the IFID area after the PrefixID, and the subsequent 48 bits are the country code. The phone number after is stored. As shown in FIG. 12, when extracting a telephone number from an IP packet having an IP header of such a source address, the first 16 bits of the IFID area are extracted as a country code, followed by 48 bits. May be extracted and converted as a telephone number after the country code.

DESCRIPTION OF SYMBOLS 10 Communication apparatus 11 IP packet generation part 15 IP network 20 Communication apparatus 21 IP packet generation part 25 IP network 26 Analog call network 100 Call system 200 Analog telephone 220 PSTN
300 VoIP GW
310 Relay function 311 Analog audio data transmission / reception IF
312 Voice / packet converter 313 Source address selector 314 IP packet transmission / reception IF
320 Address processing function 321 Source address generation unit 322 Source address setting unit 400 Corporate network 410 Router 420 Corporate network 430 IP phone 440 Call log storage server

Claims (4)

An IP packet that flows over an IP (Internet Protocol) network is received,
Depending on whether or not a communication type identifier indicating that the IP packet is a telephone communication IP packet is embedded in a source address area of an IP header of the received IP packet, the received IP packet is the telephone Identifying whether it is a communication IP packet,
When the IP packet is identified as the telecommunications IP packet, the telephone number data of the utterance source embedded in the IP header is extracted from the IP header of the IP packet;
A call log storage device that stores voice data included in the telephone communication IP packet for each telephone number indicated by the extracted telephone number data. An IP packet that flows over an IP (Internet Protocol) network is received,
Depending on whether the telephone number data embedded in the source address area of the IP header of the received IP packet is data of a predetermined method used to convert the telephone number of the utterance to the telephone number data, Identifying whether the received IP packet is a telephony IP packet;
When the IP packet is identified as the telecommunications IP packet, the telephone number data of the utterance source embedded in the IP header is extracted from the IP header of the IP packet;
A call log storage device that stores voice data included in the telephone communication IP packet for each telephone number indicated by the extracted telephone number data. An IP packet that flows over an IP (Internet Protocol) network is received,
  Depending on whether or not a communication type identifier indicating that the IP packet is a telephone communication IP packet is embedded in a source address area of an IP header of the received IP packet, the received IP packet is the telephone Identifying whether it is a communication IP packet,
  A layer 3 network transfer device for transferring the IP packet to a call log storage device on the IP network when the IP packet is identified as the telecommunications IP packet. IP receives the IP packet Ru flows over (Internet Protocol) network,
Depending on whether the telephone number data embedded in the source address area of the IP header of the received IP packet is data of a predetermined method used to convert the telephone number of the utterance to the telephone number data, Identifying whether the received IP packet is a telephony IP packet;
A layer 3 network transfer device for transferring the IP packet to a call log storage device on the IP network when the IP packet is identified as the telecommunications IP packet .

Images