JP3664718B2 - IP phone gateway device outgoing and incoming call processing, recording medium recording the program, and IP phone system - Google Patents

Description

  The present invention relates to outgoing / incoming processing of a gateway device, and more particularly to an incoming / outgoing processing method of a gateway device used in constructing an IP telephone system, a recording medium recording a program for realizing the function of the gateway device, and the gateway The present invention relates to an IP telephone system using an apparatus and software for a terminal connected to the IP telephone system.

FIG. 1 shows a usage form of a conventional IP telephone.
As shown in FIG. 1, when viewed from an end user who actually uses an IP phone, the device used by the user is a computer or a telephone. There are four ways of connection between terminals in a conventional IP telephone as shown in FIG.
1) Computer → Computer (21)
2) Computer → (Gateway) → Telephone (22)
3) Telephone → (Gateway) → Computer (23)
4) Telephone → (Gateway) → (Gateway) → Telephone (24)

  The computers (PCs) 11 and 13 require software (for example, net meeting (registered trademark)) for using the IP phone. In addition, gateway devices (GWs) 16 and 17 are required to use IP telephones with ordinary telephones 14 and 19. The gateway devices 16 and 17 are installed in the provider's center or the like via the telephone networks 15 and 18, and execute voice-packet signal conversion processing, call connection control, etc. between the telephone networks 15 and 18 and the Internet 12. To do.

  By the way, since the software and gateway device providers have provided services based on their own specifications, IP telephones have the disadvantage of being restricted to use between the same software and the same device. In recent years, standardization work has been promoted so that IP telephones can be interconnected even when different software and devices of each provider are used, mainly VoIP (Voice over Internet Protocol Forum). Recommendation H. 323 was adopted.

  The ITU-T (International Telecommunication Union-Telecommunication Standardization Sector) recommends H.264. H.323 is an international standard for “visual telephone system and device used in non-guaranteed service quality LAN” (see Non-Patent Document 1). Recommendation H. In H.323, a computer equipped with the above-described software is called an “H.323 terminal”, and the above-mentioned gateway device is called “H.323 gateway” or simply “gateway”.

  As a publicly known example related to the IP telephone system shown in FIG. 1, a database in which a user name, an IP (Internet Protocol) address, a telephone number, and the like are arranged on a server device is designated as an IP telephone destination. When the called computer corresponding to the address cannot be received (for example, when the software for IP telephone is not activated), the corresponding telephone is automatically bypassed to the telephone number obtained from the database. A communication system including means is disclosed (see Patent Document 1).

  FIG. 2 shows an example of a conventional line connection and callback operation using an IP phone. FIG. 2A shows an example in the case of transmission through the route 21 or 22 in FIG. 1, and FIG. 2B shows an example in the case of transmission through the route 23 or 24 in FIG. .

  In FIG. 2A, the IP address [a. a. a. a] the originating computer 11 sends an IP address [b. b. b. b] with respect to the destination computer 13 or the gateway device 17, its own IP address [a. a. a. a] as the calling party address. When the callee computer 13 or the gateway device 17 calls back, the passed caller address [a. a. a. a] is used.

  In FIG. 2 (b), the IP address [g. g. g. g], the originating gateway device 16 has an IP address [b. b. b. b] to the destination computer 13 or the gateway device 17, the IP address [g. g. g. g] and the telephone number [3000] of the calling terminal are notified as the calling address. When the called side computer 13 or the gateway device 17 calls back, the called side address [g. g. g. g] and the telephone number [3000] of the calling terminal.

  In the above two examples, a global IP address is used as the IP address, and each of the computers 11 and 13 and the gateway devices 16 and 17 as the transmission source and the destination is uniquely determined. Similarly, the calling telephone 14 is uniquely determined by the telephone number. Accordingly, the callee terminal and devices 11 and 14 can be clearly specified from the callee terminal and devices 13 and 17.

Published “ITU-TH Series (Audio Visual / Multimedia Related) Recommendations (Part 2)”: New Japan ITU Association Japanese Patent Application Laid-Open No. 09-168065

  By the way, as shown in the routes 21 and 22 in FIG. 1, conventionally, an IP phone transmitted from the computer 11 is directly connected to the Internet 12, and a log of the call information is individually recorded by the originating computer 11. I was collecting information. Therefore, conventionally, for example, when a company having a plurality of computers uses them as IP telephones, there has been a problem that it is difficult to grasp the entire usage status.

  In recent years, the shortage of global IP addresses has become serious, and the use of DHCP (Dynamic Host Configuration Protocol), private IP addresses, etc. is increasing as means for solving this. According to the IP address assignment method by the DHCP server, a global (unique in the world) IP address is dynamically assigned from the DHCP server when the computer is started, but a fixed address is always given from the viewpoint of each computer. It doesn't matter. The private IP address is a unique IP address that is permitted to be used only within the LAN of the private network, and is a fixed IP address for each computer, but the IP address is visible to the external public Internet. This is a prohibited IP address.

  As a result, there has been a problem in that an IP telephone cannot be received by designating the IP address directly from the outside (public Internet) to a computer in the LAN using a DHCP or private IP address.

  On the other hand, when a private IP address is used when calling an external (public Internet) IP phone from a computer in the LAN using a DHCP or private IP address, the private IP address is sent. There was a problem that the original address could not be sent to the outside. In addition, when using DHCP, outgoing IP calls can be made in principle (although a global IP address is given, although selective or time-varying), the caller at the callee side There is a problem that the other party cannot be identified when trying to call back based on the stored IP address.

  Therefore, in view of the above-mentioned various problems, the object of the present invention is to 1) efficiently manage IP telephones using computers and telephones connected to private networks, etc. 2) regardless of the use of DHCP or private IP addresses, etc. A method for processing outgoing / incoming calls of an IP telephone gateway device that enables both transmission and reception of an IP telephone by a computer and a telephone, a recording medium storing a program for realizing the function of the gateway device, and the gateway device Is to provide an IP telephone system.

According to the present invention, it is determined whether the destination address included in the received IP packet is an IP address, a telephone number outside the local station, or a telephone number within the local station. In the case of a telephone number outside the local station, the telephone apparatus corresponding to the telephone number is terminated. In the case of a telephone number within the local station, the first registration table is searched to search for the telephone number. Obtaining the IP address of the computer corresponding to the telephone number and determining the receivable state of the computer; when the computer is in a receivable state, causing the computer to receive the IP address of the obtained IP address; If it is in the unreceivable state or when the incoming call to the computer fails, The method of processing of reception IP telephone gateway device comprising is provided.

  Further, according to the present invention, it is determined whether the originating address included in the IP packet to be transmitted is a fixed IP address. If the IP address is a fixed IP address, the IP packet is transmitted as it is. If the IP address is not a valid IP address, the IP address is transmitted by replacing the originating address with the telephone number corresponding to the IP address acquired from the second registration table and the IP address of the gateway device. The log information is recorded in the IP telephone gateway device.

  There, the IP address by DHCP, the telephone number of the corresponding telephone, and the information on the availability of the computer notified from the computer in the local station are registered in the first registration table, and the IP address by DHCP This includes registering the telephone number of the corresponding telephone in the second registration table.

  Further, according to the present invention, a LAN side incoming call processing function for performing incoming processing of IP packets, a LAN side outgoing call processing function for performing outgoing processing by IP packets, a line side incoming call processing function for performing incoming processing from a telephone, Register or retrieve from the registration table the line side call processing function that performs call processing to the telephone, the IP address of the computer in the local station, the telephone number of the corresponding telephone of the computer, and the data on the reception status of the computer. There is provided a computer-readable recording medium in which a program for realizing an IP telephone gateway function including a registration / search function is recorded.

  When the destination address included in the IP packet is a telephone number in the local station, the LAN side incoming call processing function searches the registration table by the registration / search function to obtain the IP address of the computer corresponding to the telephone number And when the computer is in a receivable state, the LAN side call processing function requests that the acquired IP address be sent to the computer, and the computer cannot receive or the incoming call to the computer has failed. A function of requesting a call to the telephone of the telephone number is included in the line side call processing function.

  When the originating address included in the IP packet to be sent is not a fixed IP address, the LAN side originating processing function retrieves the originating address by searching the registration table using the registration / search function. A function of transmitting an IP packet replaced with a telephone number corresponding to the IP address and the IP address of the own computer.

  Furthermore, according to the present invention, it is constituted by an IP network, an IP telephone gateway device connected to the IP network, a computer in the local station connected to the IP telephone gateway device, and a corresponding telephone. An IP telephone system is provided.

  The gateway device for IP telephone has a registration table for registering the IP address of the computer in its own station, the telephone number of the corresponding telephone of the computer, and the receivable state of the computer, and the destination address included in the received IP packet Is a telephone number in the local station, the IP address of the computer corresponding to the telephone number is obtained by searching the registration table, and when the computer is in a receivable state, the computer having the obtained IP address is transferred to When the computer cannot receive or the incoming call to the computer fails, the call processing of the telephone number to the telephone is performed.

  Then, the computer in the local station notifies the IP telephone gateway device to register the IP address assigned by DHCP, the telephone number of the corresponding telephone, and information on the availability of the computer in the registration table.

  The IP telephone gateway apparatus has a registration table for registering the IP address of the computer in the local station and the telephone number of the corresponding telephone, and the calling address included in the packet to be transmitted is not a fixed IP address. First, a telephone number corresponding to the IP address is acquired by searching the registration table, and an IP packet in which the calling address is replaced with the IP address of the gateway device and the acquired telephone number is transmitted.

  Then, the computer in the local station notifies the IP telephone gateway device to register the IP address assigned by DHCP and the telephone number of the corresponding telephone in the registration table.

As described above, the present invention has the following advantages.
(1) In general, a telephone is advantageous in that it is always in a callable state, except during busy periods. On the other hand, having a conversation using IP phone software has many merits because it allows conversation while sharing various information on the screen. According to the present invention, when a computer is capable of receiving an IP phone, incoming calls at the computer are prioritized, which is very effective in practice.

  (2) According to the present invention, even when the originating computer does not have a fixed IP address (when using an IP address by DHCP), it is possible to make / receive an IP phone call. It is effective. Thereby, it is possible to call back from a computer that has received an IP phone call from a computer that does not have a fixed IP address.

  (3) According to the present invention, even when the IP address of the computer is changed or the corresponding telephone number is changed, for example, when the IP phone software is started or when the IP address is assigned by DHCP. The information on the gateway device side can be updated by notification from the computer.

  (4) Since all outgoing / incoming IP telephone calls by the computer are routed through the gateway device, it is possible to collect call information at the center side or the administrator side where the gateway device is installed, and in particular, the operation manager Is very effective.

FIG. 3 shows an example of a connection configuration between a calling terminal and a receiving terminal using the IP telephone gateway system according to the present invention.
In FIG. 3, the upper part of the alternate long and short dash line corresponds to the conventional connection configuration example of FIG. The connection configuration characteristic of the present invention is shown in the lower part. Here, the lower part will be described.

  As is apparent from the lower configuration of FIG. 3, the originating computer (PC) is always connected to the external networks 12 and 18 via the gateway devices 16-a to 16-c according to the present invention. With this configuration, the call log information of the originating computer can be collected by the gateway devices 16-a to 16-c according to the present invention, and the usage status of the IP phone can be centrally managed. In FIG. 3, for the sake of explanation, only one originating computer is connected to one gateway device, but all the gateway devices 16-a to 16-c are connected to the gateway devices 16-1 to 16-. 2 can be configured as one gateway device.

  Further, in connection with the above configuration, according to the present invention, it is possible to connect between LANs, which has not been heretofore known. That is, the connection configuration of “gateway → computer” (25-a to 25-c) is possible from the connection configuration of “computer → gateway”. This can be considered that the gateway device according to the present invention also has a router function. As a result, it is not necessary to assign a fixed global IP address to each computer within the range of (* 1) on each sending side and receiving side in FIG. The IP phone can be used only by itself.

FIG. 4 shows a basic configuration of an IP telephone gateway device according to the present invention. FIG. 5 shows an example of the registration tables 1 and 2 used in the gateway device of FIG.
6 to 9 are explanatory diagrams of the operation of the gateway device for IP telephone according to the present invention.

First, the operation related to the conventional function executed in the gateway device of FIG. 4 (corresponding to the upper part of the one-dot chain line of FIG. 3) will be described.
In FIG. 4, in the incoming processing from the LAN side (Internet side) (indicated by a solid line arrow in FIG. 4), the incoming call processing unit 44 receives the incoming call via the LAN board 43 and is registered in advance. The user authentication unit 41 performs user authentication. After confirming the user authentication, the line-side call processing unit 48 is requested to make a call, and the line-side call processing unit 48 calls the requested telephone. The call information collection unit 49 collects a call information log when the call is completed.

  On the other hand, in incoming call processing from the line side (indicated by a broken line arrow in FIG. 4), the incoming call processing unit 45 accepts the incoming call via the line board 46, and the user authentication unit 41 performs user authentication. Further, when the destination is a telephone number, the gateway address search unit 42 searches for the address of the gateway device that accommodates the destination based on the telephone number, and sends a call request with the searched address to the LAN side transmission processing unit 47. Is made. The LAN side transmission processing unit 47 transmits to the designated address. The call information collection unit 49 collects a call information log when the call is completed.

Next, the operation of the functional part (shaded part in FIG. 4) characteristic of the gateway device of the present invention will be described.
In the present invention, at least the transmission source computer 51 always makes an IP telephone call via the designated gateway device 40 according to the present invention. The gateway device 40 divides the processing according to the designated destination (telephone number or IP address), and further collects a log of IP phone call information transmitted by the computer 51 accommodated in the call information collection unit 49.

FIG. 6 shows an example of the operation when the gateway device 40 receives a call request from the computer 51 and the designation of the other party is a telephone number in the own station.
When the LAN side incoming call processing unit 44 shown in FIG. 4 receives an incoming call from the computer 51, the user authentication unit 41 first authenticates the user. Next, when it is determined that the other party is the telephone number [2000] in the local station, the transmission is requested to the line side transmission processing unit 48 as before, and the line side transmission processing unit 48 calls the telephone 54 (phone number [2000]). Connect to. The call information collection unit 49 collects a call information log when the call is completed.

FIG. 7 shows an operation example when the gateway device 40 receives a call request from the computer 51 and the designation of the other party is a telephone number or an IP address outside the own station.
In the case of the local telephone number on the upper side of the dotted line in FIG. 7, when the LAN side incoming processing unit 44 receives the telephone number [06-123-4567] outside the local station from the computer 51 as the destination address, the gateway address searching unit 42 Referring to the “station number-gateway IP address correspondence table” having the IP address [a. b. c. d].

  The LAN side incoming processing unit 44 sends the obtained IP address [a. b. c. d] is requested to connect to the telephone 56 (phone number [123-4567]) accommodated in the gateway device 55. The LAN call processing unit 47 performs call processing according to the request, and the call information collection unit 49 collects a call information log when the call is completed.

  On the other hand, in the case of the IP address shown on the lower side of the dotted line in FIG. 7, the LAN side incoming processor 44 receives the IP address [w. x. y. z] upon receiving a connection request to the computer 52, the IP address [w. x. y. z] is requested to connect to the computer 52. The LAN call processing unit 47 performs call processing according to the request, and the call information collection unit 49 collects a call information log at the end of the call.

FIG. 8 shows an example of an incoming call switching operation to a computer in the own station according to the present invention.
In FIG. 8, when receiving an incoming call to the telephone 54 in the own station, the gateway apparatus 40 according to the present invention switches the incoming call destination to the computer 52 side registered corresponding to the telephone number of the telephone 54.

  Before performing the above switching operation, it is necessary to complete the following processes a) and b). a) When the destination computer 52 activates the IP phone software, the destination computer 52 has its own IP address [X. X. X. Y] and the gateway device 40 is notified that the IP phone can be received by the activation of the software. b) Upon receipt of the notification, the LAN incoming call processing unit 44 writes them into the internal registration table 1 (see FIG. 5A).

  When the gateway device 40 receives an incoming call having the telephone number [2000] in its own station (in the example of FIG. 6, the telephone 54 is called as it is), in this example, the LAN incoming call processing unit 44 that received the incoming call receives the registration. Table 1 is searched to check whether the computer corresponds to the telephone number [2000] and can receive an IP phone. If reception is possible, the IP address of the corresponding computer 52 [X. X. X. Y], and thereafter, the IP address [X. X. X. Y] is requested for connection.

  On the other hand, if the reception is “impossible” or if the incoming call to the computer 52 fails as a result of the connection request as well, the line-side transmission processing unit 48 is based on the telephone number [2000] as in FIG. The telephone 54 is called. Again, the call information collection unit 49 collects a call information log.

  According to this example, by using the gateway device 40 according to the present invention to receive an incoming call from the outside (public Internet), it is also possible from outside (public Internet) to a computer in the local station using a DHCP or private IP address. It becomes possible to make an IP phone call directly.

FIG. 9 shows an example of a transmission operation from a computer according to the present invention.
FIG. 9 shows the operation of the gateway device 40 that has received a call request from the computer 51 in the private network to another gateway device 55 or the computer 52 via the external Internet, and the callback operation from the outside in that case. Is shown.

  Incidentally, as shown in FIG. 2, the IP address (global IP address [a. aa)]), and when the telephone 14 transmits via the gateway device 16, the global IP address of the gateway device + the telephone number of the telephone was notified (global in FIG. 2B). IP address [g.g.g.g] + [3000]).

  The example of FIG. 9 operates on the premise of the following a) to c). a) The originating computer 51 in the private network uses the IP address or private IP address given by the DHCP server as the IP address, and does not have a fixed global IP address. B) There is a telephone 57 (phone number [3000]) corresponding to the computer 51. Further, c) The computer 51 notifies the gateway device 40 according to the present invention of the IP address assigned from the DHCP server when the computer 51 is started.

  In FIG. 9, the gateway device 40 registers the notified IP address in correspondence with the telephone number [3000] of the corresponding telephone 57 in the registration table 2 provided in the LAN side transmission processing unit 47. FIG. 5B shows an example of the registration table 2. When the computer 51 has a fixed private IP address, the notification is not necessary, and the IP address and the corresponding telephone number may be set in the registration table 2 in advance.

  The incoming call processing unit 44 on the LAN side of the gateway device 40 is, for example, a private IP address [P. P. P. When a call is received from the computer 51 using P], the LAN side call processing unit 47 is requested to send to the other party by the process shown in FIG. In this example, the private IP address [P. P. P. The registration table 2 is searched based on P] to obtain the telephone number [3000] of the corresponding telephone. Then, the IP address [b. b. b. b] of the computer 52 or the gateway device 55 is notified of “IP address [g.g.g.g] of gateway device [10] telephone number corresponding to the computer” as the originating address.

  As described above, in this example, when the computer 51 using the IP address or private IP address assigned by DHCP other than the global IP address is transmitted to the Internet via the gateway device 40, the gateway device 40 is used. The global IP address and the telephone number corresponding to the computer are replaced and notified. As a result, it is possible to make outgoing calls from a computer using a private IP address, and the same “IP address [g.g.g.g. [3000] "can be used to call back.

FIG. 10 shows an example of information passing between apparatuses according to the present invention described so far.
FIG. 11 is an explanatory diagram of the operation of FIG.
In FIG. 10, the computer A (51) and the telephone 57 (phone number a) correspond, and the computer D (52) and the telephone 54 (phone number d) correspond. In addition, neither computer A nor D has a fixed global IP address.

  FIG. 11 shows a data image of IP packets 61 to 66 transmitted / received to / from the computers A to D also shown in FIG. Here, “originating IP:...” And “arrival IP:...” Indicate the header part, and other “originating address...” And “destination address. In the “originating IP” and “destination IP”, the IP address of the originating side device and the IP address of the destination side device of the devices directly connected to each other are respectively written. In addition, information specifying the transmission source (computer A) is specified in the “originating address”, and the destination (phone 54 connected to the gateway device C, but in the present invention computer D) is specified in the “destination address”. Each piece of information is written.

  The IP address of the computer A is written in the source address of the packet data 61 transmitted from the source computer A to the source gateway device B, and the IP address of the destination gateway device C and the destination telephone are stored in the destination address. The number d is written. The originating gateway device B searches the registration table 2 as shown in FIG. 9, obtains the corresponding telephone number a from the source IP address of the computer A received, and sets the originating address of the transmission packet data 62 as “ Replace with the IP address of the originating gateway device B + the telephone number a ”.

  In the destination gateway apparatus C, the registration table 2 is searched from the telephone number d of the destination address as shown in FIG. 8, and when the reception state of the computer D is “OK”, the destination address is converted into packet data. As shown at 63, the IP address of the computer D is replaced and transmitted. Next, when calling back from the computer D to the computer A, the received originating address “IP address of the gateway device B + phone number a” is written in the destination address. Thereafter, the originating computer A is called back by the above-described procedure (see FIGS. 9 and 8).

12 and 13 summarize the functional operations of the LAN side incoming processing unit 44 and the LAN side outgoing processing unit 47 of the gateway device 40 according to the invention described so far in a flow format.
FIG. 12 shows a processing flow of the LAN side incoming processing unit, and FIG. 13 shows a processing flow of the LAN side outgoing processing unit.
FIG. 14 shows several processing flow examples required in the present invention when starting the IP telephone software on the computer side.
In any of the drawings, the processing portion related to the present invention is indicated by a dotted frame, which is clearly distinguished from the conventional processing.

  When the incoming call from the LAN side is authenticated, the LAN side incoming processing unit 44 in FIG. 12 determines whether the received destination address is an IP address or a telephone number (S101 to 103). In the case of an IP address (see the lower side of the dotted line in FIG. 7), the LAN side transmission processing unit 47 is requested to perform transmission, and the subsequent call processing is performed (S116 to 118). When the destination address is a telephone number other than the own gateway device (see the upper side of the dotted line in FIG. 7), the IP address of the destination gateway device is acquired from the gateway address search unit 42; The LAN side call processing unit 47 is requested to make a call, and thereafter the call process is performed (S112 to 115).

  On the other hand, if the destination address is a telephone number and is in the gateway apparatus (see FIG. 8), the registration table is searched to determine whether there is a receivable computer corresponding to the telephone number ( S105). If there is, the corresponding IP address is added to the LAN side transmission processing unit 47 to request transmission, and the subsequent call processing is performed (S109 to 111). If there is not, the request is made to the line side call processing section 48 as shown in FIG. 6, and the telephone number of that telephone number is received (S106-108).

  13 receives a call request from the LAN side call processing unit 44, it determines whether or not the source IP address is a fixed global IP address (S201 and 202). If it is not a global IP address (see FIG. 9), the registration table is searched to obtain a telephone number corresponding to the calling party IP address, and the calling party IP address is set to “IP address of calling party gateway device”. Replace with “address + corresponding telephone number” (S203 and 204). If the source IP address is a fixed global IP address, it is used as it is. Thereafter, the incoming call process is performed to start the call process (S205 to 207). After the call ends, the call information collection unit 49 is requested to collect call log information (S208). In this example, a fixed global IP address is used, but any fixed IP address (including a private IP address) that can uniquely identify a computer in the own station may be used.

  In the processing on the computer side in FIG. 14, first, an IP address is obtained from the DHCP server when the computer is started (powered on) (S301 and 302). The above procedure is not necessary when a fixed global IP address or private IP address is assigned to the computer. Next, the IP telephone software is activated (or immediately before the activation), and the telephone number of the corresponding telephone, the acquired own IP address, and the receivable state (“OK”, etc.) are displayed according to the gateway according to the present invention. The device 40 is notified (S303 and 304). Before the activation, it is necessary to previously set the gateway device and the corresponding telephone number in the software (S300).

  The gateway device 40 performs necessary registration in the registration tables 1 and 2 by the notification. The subsequent processing is the same as the existing IP telephone software (S305 to 310). However, it is better to notify the gateway device 40 of “impossibility of reception”, deletion of its own IP address, etc. at the end of the software (S311). However, as described above, if there is no response from the computer side, the gateway device 40 receives the incoming call to the corresponding telephone side.

FIG. 15 shows an embodiment when the gateway device according to the present invention is arranged in a CATV station.
In FIG. 15, a gateway apparatus 40 according to the present invention, a private telephone exchange 71 such as PBX, and a CAM (Communication Access Master) 72 are installed in the CATV station. The CAM 72 is a server device arranged on the center side when performing data communication through a CATV transmission line. On the other hand, the subscriber's home includes a computer 51 connected to the CAM 72 via a cable and a telephone 57 corresponding to the computer 51, and these are a home device CAU (Communication Access Unit) having two interfaces of 10BASE-T and an analog telephone. )It is connected to the.

  As shown in FIG. 15, the computer 51 can send and receive IP telephones (81 and 82) via the LAN interface of the gateway device 40 via the CAM 72, or the line interface via the CAU 73. IP phone transmission / reception (83, 84) is possible. In particular, when the latter CAU 73 is used (in the case of a so-called CATV phone), one computer 51 and one telephone 57 are connected to the CAU 73, and the IP address of the computer 51 and the telephone number of the telephone 57 can be easily paired. 1 is associated.

  Therefore, the IP telephone usage mode using the gateway device 40 according to the present invention described so far can be applied as it is. In general CATV networks, DHCP and private IP addresses are often used. From this point of view, the application of the gateway device 40 according to the present invention is effective.

It is the figure which showed an example of the utilization form of the conventional IP telephone. It is the figure which showed an example of the conventional line connection and call back operation | movement. It is the figure which showed the example of a connection structure between the transmission side terminal using the gateway system for IP telephone by this invention, and a receiving side terminal. It is the figure which showed the basic composition of the gateway apparatus for IP telephone by this invention. It is the figure which showed an example of the registration table used with the gateway apparatus of FIG. It is the figure which showed an example of the incoming call operation | movement to the telephone in an own station. It is the figure which showed an example of the incoming call operation to the telephone or computer outside the local station. It is the figure which showed an example of the incoming call switching operation to the computer in the own station. It is the figure which showed an example of the transmission operation | movement from a computer. It is the figure which showed an example of the information delivery between apparatuses. It is operation | movement explanatory drawing of FIG. It is the figure which showed an example of the processing flow of the LAN side incoming call process part. It is the figure which showed an example of the processing flow of the LAN side transmission process part. It is the figure which showed an example of the processing flow of a computer. It is the figure which showed the Example which has arrange | positioned the gateway apparatus by this invention to the CATV station.

Explanation of symbols

11, 13, 51, 52 ... Computers 14, 19, 53, 54, 56, 57 ... Telephone 12 ... Internet 16, 17, 40, 55 ... Gateway devices 15, 18 ... Telephone network 44 ... LAN side incoming call Processing unit 47 ... LAN-side transmission processing unit 42 ... Gateway address search unit 49 ... Call information collection units 61 to 66 ... IP packet 71 ... Exchange 72 ... CAM
73 ... CAU

Claims (8)

Determining whether the destination address included in the received IP packet is an IP address, a telephone number outside the local station, or a telephone number within the local station;
In the case of an IP address, make the incoming call to the computer having the IP address
In the case of a phone number outside your own station, make sure that the gateway device corresponding to that phone number receives the call,
In the case of the telephone number in the own station, the first registration table is searched to obtain the IP address of the computer corresponding to the telephone number, and the receivable state of the computer is determined.
When the computer is in a receivable state, making the computer receive the IP address obtained,
When the computer is in an incapable reception state or when the incoming call to the computer has failed, the telephone number of the telephone number is received.
An incoming call processing method for an IP telephone gateway device, comprising: Determining whether the originating address included in the outgoing IP packet is a fixed IP address;
In the case of a fixed IP address, send the IP packet as it is,
If it is not a fixed IP address, sending an IP packet in which the originating address is replaced with the telephone number corresponding to the IP address obtained from the second registration table and the IP address of the gateway device;
Recording log information of outgoing IP packets;
An outgoing call processing method for an IP telephone gateway device comprising: Further, notified from the local station computer, IP address, and phone number of the corresponding telephone by DHCP, and information indicating the usability of computer, includes registering the first registration table, The method of claim 1, wherein . LAN-side incoming processing function for incoming processing of IP packets;
LAN side outgoing call processing function for outgoing call processing by IP packet,
Line-side incoming call processing function for incoming call processing from the telephone,
Line-side call processing function that performs call processing to the telephone,
An IP telephone gateway comprising an IP address of a computer in the own station, a telephone number of a corresponding telephone of the computer, and a registration / search function for registering or retrieving data of the computer's reception status in the registration table A computer-readable recording medium storing a program for realizing a function,
When the destination address included in the IP packet is a telephone number in the local station, the LAN side incoming call processing function searches the registration table by the registration / search function to obtain the IP address of the computer corresponding to the telephone number And when the computer is in a receivable state, the LAN side call processing function requests that the acquired IP address be sent to the computer, and the computer cannot receive or the incoming call to the computer has failed. A computer-readable recording medium, comprising: a function of requesting the telephone number to be transmitted to the telephone when the line-side transmission processing function is performed. LAN-side incoming processing function for incoming processing of IP packets;
LAN side outgoing call processing function for outgoing call processing by IP packet,
Line-side incoming call processing function for incoming call processing from the telephone,
Line-side call processing function that performs call processing to the telephone,
A computer-readable recording of a program for realizing an IP telephone gateway function comprising a registration / retrieval function for registering or retrieving from the registration table the IP address of the computer in the local station and the telephone number of the corresponding telephone. A possible recording medium,
When the originating address included in the IP packet to be sent is not a fixed IP address, the LAN side originating processing function retrieves the originating address by searching the registration table using the registration / search function. A computer-readable recording medium comprising a function of transmitting an IP packet replaced with a telephone number corresponding to an IP address and an IP address of the own computer. An IP telephone system comprising: an IP network; an IP telephone gateway device connected to the IP network; a computer in the own station connected to the IP telephone gateway device; and a corresponding telephone.
The gateway device for IP telephone has a registration table for registering the IP address of the computer in its own station, the telephone number of the corresponding telephone of the computer, and the receivable state of the computer, and the destination address included in the received IP packet Is a telephone number in the local station, the IP address of the computer corresponding to the telephone number is obtained by searching the registration table, and when the computer is in a receivable state, the computer having the obtained IP address is transferred to When the computer is in an unreceivable state or when the incoming call to the computer fails, the telephone number is transmitted to the telephone.
The computer in the local station notifies the IP telephone gateway device in order to register the IP address given by DHCP, the telephone number of the corresponding telephone, and information on the availability of the computer in the registration table. A featured IP telephone system. An IP telephone system comprising: an IP network; an IP telephone gateway device connected to the IP network; a computer in the own station connected to the IP telephone gateway device; and a corresponding telephone.
The IP telephone gateway apparatus has a registration table for registering the IP address of the computer in its own station and the telephone number of the corresponding telephone, and when the calling address included in the packet to be transmitted is not a fixed IP address , Obtaining a telephone number corresponding to the IP address by searching the registration table, sending an IP packet in which the originating address is replaced with the IP address of the gateway device and the obtained telephone number;
The IP telephone system characterized in that the computer in the local station notifies the IP telephone gateway apparatus to register the IP address assigned by DHCP and the telephone number of the corresponding telephone in the registration table. 3. The method according to claim 2, further comprising registering an IP address by DHCP and a telephone number of a corresponding telephone in the second registration table.

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