JP2004007550A - Integrated services digital network adapter for voice over internet protocol and voice over internet protocol telephone conversation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To compose a VoIP (voice over the Internet Protocol System) capable of easily utilizing a VoIP telephone call with a current ISDN (Integrated Services Digital Network) environment retained. <P>SOLUTION: The front end 11 of an ISDN adapter 1 for VoIP receives adapter information including an IP address of the other party connected to the ISDN and transmits the adapter information of a caller side to the other party. The adapter information of the other party is transmitted to a signal conversion part 12 in the same adapter, and the signal conversion part 12 gives the IP address to a second VoIP adapter 3. An audio signal transmitted from an information terminal 5 connected to an ISDNPBX4 is transmitted to a second VoIP adapter 3 through the signal conversion part 12. The second VoIP adapter 3 converts the audio signal to a predetermined data format and transmits it to the VoIP adapter in the other party on the network through a network controller 6 on the basis of the obtained IP address in the other party. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a VoIP ISDN adapter that realizes VoIP (Voice over IP) using an ISDN line and a network.
[0002]
[Prior art]
Currently, IP data communication such as e-mail and file transfer exists in addition to voice communication such as telephone and facsimile as communication means between users such as companies and individuals and between individual users in the company. Each of these two communication networks has a different configuration, and a network must be constructed for each. It is rational if these two networks can be integrated, and an effective network can be established with minimum capital investment.
[0003]
In recent years, the amount of communication between users has been larger in IP data communication than in voice communication. As a method for integrating the networks, VoIP (Voice) is a method of transmitting voice communication over an IP data communication network. over IP) is generally used.
[0004]
In the VoIP communication system, an analog audio signal is converted into digital audio data and transmitted over a IP network using a predetermined protocol. The most common conversion format is to convert a voice signal into an IP packet and transmit it, and the most general transmission method is to transmit using a UDP / IP protocol.
[0005]
In the VoIP system, users who talk to each other are provided with VoIP adapters, each connected to an information terminal such as a telephone, and after confirming a communication partner on an analog line, based on a partner address stored in the VoIP adapter. To communicate via a network.
[0006]
As shown in FIG. 8, the VoIP adapter 101 is connected via a line connection terminal (Line terminal) connected to an analog public line, a terminal connection terminal (Tel terminal) connected to an information terminal 102 such as a telephone, and a network adapter 103. A network connection terminal (LAN terminal) for connecting to a network.
[0007]
The VoIP adapter 101 inputs a voice signal transmitted from the information terminal 102 from a TEL terminal, and transmits the voice signal from a Line terminal to a communication partner via an analog public line. If the same VoIP adapter 201 exists on the other side, a signal indicating the existence is transmitted and recognized by the VoIP adapter 101 on the transmitting side.
[0008]
If the other party has the VoIP adapter 201 as described above, the VoIP adapter 101 converts the audio signal transmitted from the information terminal 102 to generate audio data, and transmits the audio data from the network connection terminal to the network adapter 103. 103 transmits voice data to the other party using a predetermined protocol. On the other side, the VoIP adapter 201 receives the voice data via the network controller 203, converts the voice data into a voice signal, and transmits the voice signal to the information terminal 202. In this way, voice signals are transmitted and received via the network for both calls.
[0009]
[Problems to be solved by the invention]
However, such a conventional VoIP communication system has the following problems to be solved.
[0010]
In a conventional VoIP communication system, an analog public circuit and a network are switched to communicate an audio signal or audio data. However, a digital line such as an ISDN line transmits and receives a digital ISDN signal, so that a conventional VoIP adapter for an analog public line cannot be used.
[0011]
Therefore, in order to use the VoIP communication system, an analog network must be constructed separately from the ISDN line, and the installation cost becomes large.
[0012]
Various VoIP-compatible ISDN terminals have also been devised. However, these are integrated with a VoIP communication system using an analog line and an ISDN conversion circuit, so that the equipment becomes expensive and the equipment cost increases.
[0013]
An object of the present invention is to configure an inexpensive VoIP ISDN adapter that enables easy use of a VoIP call while maintaining the current ISDN environment, and a VoIP call system that performs a call using the adapter. It is in.
[0014]
[Means for Solving the Problems]
The ISDN adapter for VoIP according to the present invention converts a ISDN signal and a voice signal to each other, and exchanges adapter information and an IP address for both sides of a call, and a front end unit between the ISDN terminal and the VoIP adapter. And a signal conversion unit for performing the signal conversion of
[0015]
The front end unit is connected to an ISDN line, and a digital ISDN signal transmitted through the ISDN line is converted into an analog signal by the front end unit and transmitted to the VoIP adapter. An analog signal from the VoIP adapter is converted into an ISDN signal and transmitted to an ISDN line.
[0016]
Further, the front end unit obtains the adapter information and the IP address of the other party and transmits them to the signal conversion unit. Further, it obtains its own IP address from the network controller, and transmits it along with its own adapter information to the other party's VoIP ISDN adapter via the ISDN line.
[0017]
As described above, since the IP addresses and the like are exchanged via the VoIP ISDN adapters of both sides of the call, the mutual IP addresses can be acquired without opening the ISDN line between the ISDN terminals.
[0018]
The signal conversion unit transmits the partner's IP address in the adapter information from the front end unit to the VoIP adapter.
[0019]
An ISDN signal including voice data transmitted from an ISDN terminal is input to a signal converter, and the signal converter converts the signal into an analog voice signal for transmission to a VoIP adapter.
[0020]
The VoIP adapter converts the analog audio signal into a digital signal again to generate audio data, and transmits the audio data to the network controller together with the IP address of the other party.
[0021]
The network controller transmits the voice data to the network controller of the other party via the network based on the IP address and the voice data of the other party.
[0022]
The other party's VoIP adapter converts the received voice data into a voice signal and sends it to the signal conversion unit of the VoIP ISDN adapter. The signal conversion unit converts an analog audio signal into an ISDN format and transmits the ISDN format to the ISDN terminal.
[0023]
In this way, a telephone call is performed by transmitting and receiving voice data obtained by converting a voice signal into a predetermined format through a network using a predetermined protocol.
[0024]
Further, the ISDN adapter for VoIP of the present invention comprises a front end unit for mutually converting between an ISDN signal from an ISDN line and digital data of a predetermined format from a signal conversion unit, an analog signal inputted from the VoIP adapter and a signal conversion. And a VoIP transmitting / receiving section for mutually converting digital data of a predetermined format from the section, a digital signal from the front-end section and the VoIP transmitting / receiving section to be converted into an ISDN signal to be transmitted to the ISDN terminal, and to the ISDN terminal. And a signal converter for converting the ISDN signal into digital data of a predetermined format and selecting and outputting the digital data to either the front end unit or the VoIP transmitting / receiving unit. The signal conversion unit outputs digital data to either the front end unit or the VoIP transmission / reception unit according to a preset telephone number.
[0025]
With this configuration, when a call signal including the telephone number of the other party is input in ISDN format from the ISDN terminal, the signal conversion unit converts the ISDN format call signal into a digital signal of a predetermined format that can be processed by a microcomputer or the like. The digital data is converted into data, the telephone number information of the other party is detected from the digital data, and it is confirmed whether the digital data corresponds to a preset telephone number.
[0026]
Here, if the setting of using the ISDN line is made in advance when the other party's telephone number corresponds to the set telephone number, the signal conversion unit includes the telephone number information if the setting corresponds to the set telephone number. A digital data call signal is transmitted to the front end unit. The front-end unit converts the digital data into a call signal in the ISDN format again and transmits it to the other party via the ISDN network.
[0027]
On the other hand, if the other party's telephone number information does not correspond to the preset telephone number, the signal converter outputs the calling signal of the digital data to the VoIP transmitter / receiver, and the VoIP transmitter / receiver transmits this signal to the dial pulse. Alternatively, the call signal is converted into a call signal in the DTMF format and output to the VoIP adapter.
[0028]
Also, if the setting to use the VoIP line is made in advance when the other party's telephone number corresponds to the set telephone number, if the corresponding telephone number corresponds to the set telephone number, the signal conversion unit includes a digital telephone including the telephone number information. A data calling signal is transmitted to the VoIP transmitting / receiving section. The VoIP transmitting / receiving unit converts the digital data into a dial pulse or a call signal in DTMF format and outputs it to the VoIP adapter.
[0029]
On the other hand, if the other party's telephone number information does not correspond to the preset telephone number, the signal conversion section outputs the digital data calling signal to the front end section, and the front end section converts this signal into ISDN format. Then, the data is transmitted to the other party via the ISDN network.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
A configuration of a VoIP ISDN adapter according to a first embodiment of the present invention and a configuration of a VoIP communication system using the same will be described with reference to FIGS.
[0031]
FIG. 1 is a block diagram showing a configuration of a system using an ISDN adapter for VoIP.
FIG. 2 is a procedure diagram showing a signal flow from the transmission to the setting of the VoIP environment.
FIG. 3 is a schematic configuration diagram of an example of the subaddress of the ISDN data.
[0032]
FIG. 4 is a procedure diagram showing a data flow in a VoIP environment.
[0033]
In FIG. 1, 1 is an ISDN adapter for VoIP, 11 is a front end unit, 12 is a signal conversion unit, 2 and 3 are first and second VoIP adapters respectively, 4 is an ISDN BPBX (exchange), 5 is an information terminal, 6 is a network controller.
[0034]
As shown in FIG. 1, the VoIP ISDN adapter 1 according to the first embodiment of the present invention includes a front end unit 11 and a signal conversion unit 12 which are connected to each other.
[0035]
The front end unit 11 includes one ISDN line terminal and two analog line terminals. An ISDN public line is connected to the ISDN line terminal, and first and second analog line terminals are respectively connected to the two analog line terminals. VoIP adapters 2 and 3 are connected.
[0036]
Further, the front end unit 11 sets the adapter information of the present invention in the subaddress of the ISDN signal in a data structure as shown in FIG. 3 and transmits the same to the partner front end unit.
[0037]
In addition to the telephone number, a subaddress of 18 bytes or less can be added to the transmission of the ISDN line. This sub-address is usually used to directly specify each information terminal 5 from the outside, but can be used for adapter information including an IP address.
[0038]
As shown in FIG. 3, the adapter information is composed of a 4-byte adapter ID, an individual number, an IP address, and a 6-byte telephone number of 18 bytes. Here, the adapter ID identifies each VoIP ISDN adapter using characters, symbols, company names, and the like, and the individual number identifies individual ISDN terminal devices using a serial number and the like. The telephone number is its own telephone number, and the IP address is its own IP address. Note that the own IP address is obtained from the network controller 6.
[0039]
The assignment in FIG. 3 is an example, and a port number designating a VoIP adapter may be assigned to a subaddress.
[0040]
The signal conversion unit 12 includes one ISDN line terminal and two analog line terminals. The ISDN line terminal is connected to the ISDNBPBX 4 via the ISDN line. Second VoIP adapters 2 and 3 are connected. Further, the signal conversion unit 12 acquires the IP address of the other party from the front end unit 11 and transmits the IP address to the first and second VoIP adapters 2 and 3.
[0041]
Each of the first and second VoIP adapters 2 and 3 has two analog line terminals and one network terminal. These two analog line terminals are respectively connected to the front end unit 11 of the VoIP ISDN adapter 1 and the signal conversion unit. It is connected to the unit 12. The network terminal is connected to the network controller 6.
[0042]
The network controller 6 is connected to the first and second VoIP adapters 2 and 3 and connected to a network, and transmits and receives data according to a predetermined protocol.
[0043]
A plurality of information terminals 5 such as telephones are connected to the ISDN PBX 4 and select an information terminal to be connected based on ISDN network information obtained in advance from an ISDN line network.
[0044]
Next, a procedure for setting a VoIP communication environment using an ISDN line will be described with reference to FIG. In this description, a telephone is used as the information terminal.
[0045]
The calling user inputs a telephone number of the other party to be called from the telephone and transmits a calling signal. This call signal is transmitted to the front-end unit 11 via the ISDNPBX 4 and the signal conversion unit 12 in this order (s1).
[0046]
The front end unit 11 converts the call signal into an ISDN signal format, sets the adapter information in a subaddress of the ISDN signal, and transmits the adapter information to the ISDN public line (s2).
[0047]
When the VoIP ISDN adapter of the other party recognizes the call signal to which the adapter information of the caller is attached, a response signal to which the adapter information of the other party is attached is returned (s3). Here, the call signal is not transmitted to the other party's ISDNBPBX or telephone.
[0048]
When receiving the response signal from the other party, the transmitting-side front-end unit 11 extracts the adapter information and transmits it to the signal conversion unit 12. Here, the adapter information is transmitted and received using the internal circuit of the VoIP ISDN adapter.
[0049]
When the signal conversion unit 12 obtains the IP address from the partner adapter information, the VoIP ISDN adapter 1 releases the ISDN line (s4). Then, the IP address is transmitted to the first VoIP adapter 2 or the second VoIP adapter 3.
[0050]
Here, if the other party does not have an adapter having the same specification as the calling side VoIP ISDN adapter, the VoIP ISDN adapter 1 once releases the ISDN line, deletes the sub address, and transmits again. Connect the ISDN line and talk.
[0051]
As described above, by exchanging the adapter information using the ISDN subaddress, the mutual adapter information can be exchanged without calling the other party's telephone. The ISDN subaddress is an additional function of the ISDN line, and is incorporated in the line service. Therefore, it is possible to exchange data required for setting a VoIP communication environment such as an IP address without being charged.
[0052]
Next, the procedure of a VoIP call will be described with reference to FIG.
[0053]
Here, in the following description, a network connection using the second VoIP adapter 3 is shown. However, the same procedure is used even when the first VoIP adapter 2 is used.
[0054]
Upon acquiring the IP address of the other party, the VoIP ISDN adapter 1 transmits only the IP address to the second VoIP adapter 3 by dial tone or DTMF tone (s11). The second VoIP adapter 3 converts the other party's IP address into digital data and transmits the digital data. Then, the second VoIP adapter 3 sends outgoing request data with its own (outgoing side) VoIP adapter information attached to the other party's VoIP adapter. It is transmitted via (s12). When the other party's VoIP adapter receives this outgoing request data via the network and the other party's network controller, it sends outgoing response data including its own (other party's) VoIP adapter information to the second VoIP adapter 3 via the network. (S13).
[0055]
As described above, the second VoIP adapter 3 exchanges VoIP adapter information with the other party's VoIP adapter, and sets an environment in which a VoIP call can be made. Here, the network controller 6 connects to the specified IP address based on the specified IP address.
[0056]
When the VoIP communication environment is set, the other party's VoIP adapter transmits an incoming call signal to the other party's telephone via the VoIP ISDN adapter and ISDNBPBX (s14).
[0057]
When the other party off-hooks the telephone receiver, a response signal is transmitted and transmitted to the VoIP adapter via the ISDN BX and the VoIP ISDN adapter (s15).
[0058]
The other party's VoIP adapter converts this response signal into a network protocol and sends it as terminal connection response data to the second VoIP adapter 3 via the network controller, the network, and the originating network controller 6 (s16). .
[0059]
Upon receiving the terminal connection response data from the other party, the second VoIP adapter 3 transmits the call start confirmation data to the other party's VoIP adapter, and the other party's VoIP adapter responds to the call start confirmation data with the terminal connection completion data. Is transmitted (s17 → s18). After transmitting and receiving the call start confirmation, a response signal is transmitted to the calling telephone via the second VoIP adapter 3, the VoIP ISDN adapter 1 and the ISDN BPBX 4 (s19), and the VoIP call is started. (S20).
[0060]
When a call is started, both VoIP adapters that make the call convert their respective audio signals into audio data of a predetermined format, and the parties communicate with each other via a network using a predetermined protocol.
[0061]
In the present embodiment, the case where the callers exist in one network has been described. However, when the callers exist in different networks, a network controller that connects these networks may be used. For example, when a VoIP call is made between telephones located in networks that are far apart from each other, the VoIP call can be realized by using a modem or the like connected to a public line from each network.
[0062]
Further, in this embodiment, the method of converting the call between the ISDN line and the information terminal connected by the ISDN BPBX into a VoIP call has been described, but the signal conversion unit of the VoIP adapters 2 and 3 and the VoIP ISDN adapter 1 in FIG. By inserting an analog line PBX into an analog circuit between the terminal 12 and the terminal 12, it is also possible to realize a VoIP call by an information terminal connected to the analog line PBX.
[0063]
It is also possible to directly connect a VoIP adapter to an analog public line without using the front end unit 11. However, in this case, since the IP address cannot be obtained automatically, the method of setting the VoIP environment becomes complicated, or a fixed address is used.
[0064]
Next, an ISDN adapter for VoIP according to a second embodiment will be described with reference to FIGS. 5, 6, and 7. FIG.
FIG. 5 is a configuration diagram of a system using the VoIP ISDN adapter according to the present embodiment.
In FIG. 5, 1 is a VoIP ISDN adapter, 11 is a front end unit, 12 is a signal conversion unit, 13 is a VoIP transmitting and receiving unit, 2 and 3 are first and second VoIP adapters, respectively, and 4 is an ISDN BPBX (exchange). Reference numeral 5 denotes an information terminal, and reference numeral 6 denotes a network controller.
FIG. 6 is a configuration diagram of the signal conversion unit 12, wherein 21 is an ISDN signal conversion unit, and 22 is a line selection unit.
[0065]
As shown in FIG. 5, the VoIP ISDN adapter 1 according to the second embodiment of the present invention includes a front end unit 11 connected to an ISDN line, a signal conversion unit 12 connected to an ISDN BX4, And a VoIP transmission / reception unit 13 connected to the VoIP adapters 2 and 3. A signal conversion unit 12 is connected to the front end unit 11 and the VoIP transmission / reception unit 13.
[0066]
The signal conversion unit 12 includes an ISDN signal conversion unit 21 connected to the ISDNBPBX 4 and a line selection unit 22 connected to the front end unit 11 and the ISDN signal conversion unit 21.
[0067]
The ISDN signal converter 21 converts the ISDN signal received from the ISDN PBX 4 into digital data of a predetermined format that can be processed by the line selector 22, outputs the digital data to the line selector 22, and outputs the digital data input from the line selector 22. The data is converted to the ISDN format and transmitted to ISDNBPBX4. For example, the U-point signal received from the ISDNBPBX 4 is converted into digital data of a predetermined format, and the digital data is converted into a U-point signal.
[0068]
The line selection unit 22 detects telephone number information from the call signal converted into digital data by the ISDN signal conversion unit 21 and outputs it to either the front end unit 11 or the VoIP transmission / reception unit 13. When a call signal is input from the other party via the front end unit 11 or the VoIP transmitting / receiving unit 13, the line selecting unit 22 checks the idle channel of the ISDNPBX 4 and calls the idle channel if any. The signal is output to the ISDN signal converter 21. If there is no vacant channel, a signal indicating that the line is in use is transmitted to the other party via the front end unit 11 or transmitted to the other party via the VoIP transmitting / receiving unit 13.
[0069]
When the transmission / reception unit 13 for VoIP is selected as a signal transmission source by the line selection unit 22, the VoIP transmission / reception unit 13 electrically off-hooks any of the unused first and second VoIP adapters 2 and 3, The digital telephone number information of the other party is converted into a dial pulse or a DTMF signal and transmitted to the off-hook VoIP adapter. On the other hand, when receiving the incoming signal (bell ringing signal) from the first and second VoIP adapters 2 and 3, the VoIP transmitting / receiving section 13 electrically off-hooks the VoIP adapter. When the VoIP transmitting / receiving section 13 receives a call signal including telephone number information in the form of a dial pulse or DTMF signal, the VoIP transmitting / receiving section 13 converts the call signal into a digital signal format and outputs it to the line selecting section 22.
[0070]
Each of the first and second VoIP adapters 2 and 3 has an analog line terminal and a network terminal, and the analog line terminal is connected to the VoIP transmitting / receiving unit 13 of the VoIP ISDN adapter 1. The network terminal is connected to the network controller 6.
Other configurations are the same as those of the system shown in FIG.
[0071]
Next, a procedure for making a call using the above-described system will be described. In this description, a telephone is used as the information terminal 5.
[0072]
The calling user uses the telephone, which is the information terminal device 5, to input the telephone number of the other party to be called and transmit a calling signal. This call signal is transmitted to the ISDN signal converter 21 of the signal converter 12 via the ISDN BPBX 4.
[0073]
The ISDN signal converter 21 converts the call signal in the ISDN format into a predetermined digital format and outputs it to the line selector 22.
[0074]
A plurality of predetermined telephone numbers are stored in the line selection unit 22 in advance, and the line selection unit 22 detects telephone number information from the input call signal and determines whether or not the telephone number information matches the stored telephone number. Confirm. Here, there are two methods for confirming a telephone number: a method for confirming whether the stored telephone number completely matches the other, and a method for confirming whether a predetermined number of numbers from the beginning of the telephone number match. The user sets in advance which confirmation method is to be used depending on the application. Further, the line selection unit 22 is provided with a table shown in FIG. 7 in which a special number such as "110" police call is stored in advance, and the telephone number information is detected from the call signal, and based on the table, To confirm whether the telephone number corresponds to the telephone number stored in the table.
[0075]
Then, if the telephone number corresponds to a telephone number stored in advance or a telephone number stored in a table, or if the user of the calling party has a specific telephone number such as “0000” at the beginning of the telephone number of the other party, When a number is assigned, the line selecting unit 22 outputs a call signal including telephone number information to the front end unit 11. The front end unit 11 reconverts the call signal into the ISDN format and transmits the call signal to the front end unit of the VoIP ISDN adapter on the other side via the ISDN line network.
[0076]
When the other party off-hook the receiver of the telephone, a response signal is transmitted, and the response signal is transmitted to the VoIP ISDN adapter 1 on the transmission side to start the telephone conversation.
[0077]
On the other hand, when the telephone number of the other party does not correspond to the telephone number stored in the table, the line selecting unit 22 outputs the telephone number information to the VoIP transmitting / receiving unit 13. The VoIP transmitting / receiving unit 13 converts the input telephone number information into a dial pulse or a DTMF signal and transmits the dial pulse or DTMF signal to the second VoIP adapter 3, and the second VoIP adapter 3 sends outgoing request data based on the received telephone number information. To the VoIP call management means in the network via the network controller 6.
[0078]
The VoIP call management means stores an IP address corresponding to the registered telephone number, detects the telephone number of the other party from the received outgoing call request data, and obtains an IP address corresponding to the telephone number. Then, the transmission request data is transmitted to the VoIP adapter having the IP address.
[0079]
Upon receiving this call signal via the other party's network controller, the other party's VoIP adapter sends outgoing response data to the second VoIP adapter 3 via the network. When the VoIP call environment is set, the other party's VoIP adapter sends an incoming call signal to the other party's telephone. Then, a response signal is transmitted to the VoIP adapter when the other party goes off-hook on the telephone receiver. The other party's VoIP adapter converts this response signal into a protocol of the network to be connected, and converts the response signal into terminal connection response data via the other party's network controller, the network, and the originating network controller 6 via the second VoIP adapter. Send to 3.
[0080]
Upon receiving the terminal connection response data from the other party, the second VoIP adapter 3 transmits the call start confirmation data to the other party's VoIP adapter, and the other party's VoIP adapter responds to the call start confirmation data with the terminal connection completion data. Send After transmitting and receiving the call start confirmation, a response signal is transmitted to the VoIP transmitting / receiving unit 13 via the second VoIP adapter 3. The VoIP transmitting / receiving section 13 transmits this response signal to the calling telephone via the line selecting section 22, the ISDN signal converting section 21, and the ISDN BX4, and the VoIP call is started.
[0081]
If the other party cannot make a VoIP call even if the VoIP call is selected, the line selecting unit 22 switches the call signal from the VoIP transmitting / receiving unit 13 to the front end unit 11 and outputs the signal. That is, it is also possible to switch from a VoIP call to an ISDN line call.
[0082]
With this configuration, the VoIP ISDN adapter automatically selects an appropriate line network (call network) according to the other party with reference to a preset telephone number. Even if a network is not selected and transmission is performed, communication can be performed through an ISDN line network or VoIP, whichever is the most appropriate, depending on the other party.
[0083]
In the present embodiment, a table of telephone numbers for selecting a call network can be set by a user. This allows the user to set the contents of the table in advance, so that a more optimal communication network can be automatically selected for each call.
[0084]
Also, in the present embodiment, a call is made on the ISDN network only when the outgoing telephone number corresponds to a telephone number stored in advance, a telephone number set in a table, or when a specific number is added to the head. However, only in such a case, it is possible to make a setting to talk on the VoIP network. In this case, if the telephone number corresponds to the above-mentioned telephone number, a call is made on the VoIP network, and if not, a call is made on the ISDN network.
[0085]
【The invention's effect】
According to the present invention, by connecting the ISDN adapter for VoIP to the VoIP adapter, a VoIP system for easily connecting to the ISDN network based on the adapter information including the mutual IP addresses transmitted and received on the ISDN line is constructed. can do.
[0086]
In addition, simply connecting the VoIP adapter, which is widely distributed, and the ISDN adapter for VoIP to the current ISDN network enables a VoIP call, so the inexpensive equipment can be used while using the current ISDN line system as it is. A VoIP system can be configured with investment.
[0087]
Also, by transmitting and receiving address information including each other's IP address using the subaddress of the ISDN line, and exchanging this between the VoIP ISDN adapters, the IP address and the like can be exchanged without opening the ISDN line between the information terminals. Can be exchanged. Thus, the VoIP communication environment can be quickly set without being charged.
[0088]
Further, according to the present invention, an appropriate communication network is automatically selected according to the communication partner by the VoIP ISDN adapter, so that the user does not need to select a communication network for each communication partner and place a call, and the communication partner can be selected. Accordingly, communication can be performed through an optimal communication network between the ISDN line network and VoIP.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a system using an ISDN adapter for VoIP according to a first embodiment.
FIG. 2 is a procedure diagram showing a signal flow from originating to setting a VoIP environment;
FIG. 3 is a schematic configuration diagram of a subaddress of ISDN data;
FIG. 4 is a procedure diagram showing a data flow in a VoIP environment.
FIG. 5 is a configuration diagram of a system using an ISDN adapter for VoIP according to a second embodiment;
FIG. 6 is a schematic configuration diagram of a signal conversion unit 12 according to a second embodiment.
FIG. 7 is a diagram showing the contents of a table provided in a line selection unit for storing a telephone number for selecting a telephone network;
FIG. 8 is a configuration diagram of a conventional VoIP system connected to an analog public circuit.
[Explanation of symbols]
1-VoIP ISDN Adapter
11-Front end part
12-signal converter
13-VoIP transceiver
21-ISDN signal converter
22-Line selection unit
2,3,101,201-VoIP Adapter
4-ISDNBPBX (ISDN exchange)
5,102,202-Information terminal
6,103,203-Network controller

Claims (5)

Converting the ISDN signal from the ISDN line into an analog signal and sending it to the VoIP adapter, converting the analog signal from the VoIP adapter into an ISDN signal and sending it to the ISDN line,
A front-end unit for acquiring adapter information and an IP address of the other party connected to the ISDN line, transmitting the adapter information and the IP address to the signal conversion unit, and transmitting its own IP address to the other party; ,
Transmitting to the VoIP adapter an IP address of the other party and an analog signal obtained by converting an ISDN signal from an ISDN terminal connected thereto;
A signal conversion unit that receives an analog signal from the other party via the VoIP adapter, converts the analog signal into an ISDN signal, and transmits the ISDN signal to the ISDN terminal;
An ISDN adapter for VoIP, comprising: A VoIP ISDN adapter according to claim 1, comprising a plurality of the VoIP adapters connected to the VoIP ISDN adapter, and the network adapter connected to the plurality of VoIP adapters,
A VoIP call system, wherein the VoIP call environment is set by transmitting and receiving the IP address and the adapter information between the VoIP ISDN adapters installed in both sides of a call. A front-end unit that converts an ISDN signal received from the ISDN line into digital data of a predetermined format and outputs the digital data, converts the input digital data into an ISDN signal, and transmits the ISDN signal to the ISDN line;
A VoIP transmitter / receiver that converts an analog signal input from the VoIP adapter into the predetermined format digital data and outputs the same, and converts the input predetermined format digital data into an analog signal and outputs the analog signal to the VoIP adapter When,
The digital data from the front end unit and the VoIP transmitting / receiving unit is converted into an ISDN signal and transmitted to an ISDN terminal, and the ISDN signal from the ISDN terminal is converted into digital data of the predetermined format. A signal converter that selectively outputs to either the end unit or the VoIP transmitting / receiving unit;
An ISDN adapter for VoIP, comprising: The signal conversion unit detects telephone number information from digital data obtained by converting the ISDN signal, and converts the digital data to the front end unit only when the telephone number information corresponds to a preset telephone number. 4. The ISDN adapter for VoIP according to claim 3, wherein the adapter outputs the data to the network. The signal conversion unit detects telephone number information from digital data obtained by converting the ISDN signal, and transmits and receives the digital data only when the telephone number information corresponds to a preset telephone number. The ISDN adapter for VoIP according to claim 3, wherein the ISDN adapter outputs the data to a unit.

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