JP2003069602A - Ip telephone server, ip telephone client, method and program for establishing session - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an IP telephone system which enables even a PC or the like having only a non-fixed IP address to use IP telephone. SOLUTION: An IP telephone client A transmits a calling control packet including the IP telephone address of an IP telephone client B. When receiving this packet, an IP telephone server A performs procedures for holding the non- fixed IP address of the client A till the end of IP telephone and transmits the packet to an IP telephone server B on the client B side. When receiving it, the server B performs procedures for holding the non-fixed IP address of the client B till the end of IP telephone and transmits the packet to the client B. The client B informs a user of incoming in a prescribed form when receiving it and transmits a response packet to the calling control packet to the client A when being instructed to respond to the incoming by the user.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to the Internet.
IP telephone server for protocol telephone system, IP
A telephone client and a session establishment method.

[0002]

2. Description of the Related Art In recent years, the Internet has become widespread and various services using the Internet have been provided or proposed. One of them is the Internet which realizes a telephone call by exchanging voice data packets via the Internet. -Protocol telephone (IP telephone) is receiving attention.

In the conventional IP telephone, as shown in FIG. 12, communication is performed between IP telephone clients having a fixed IP address using the fixed IP address. That is, only a PC or the like having a fixed IP address could use the IP telephone.

[0004]

However, in general households, an IP address is usually a non-fixed IP address that is temporarily leased by an Internet service provider (ISP) by a DHCP mechanism. Since there is a possibility that it may fluctuate in units of time, it is not possible to specify the IP address of the call destination, and in this case, the conventional IP telephone cannot be used. In addition, a corporate network usually has only one or a few fixed IP addresses, and most PCs in the corporate network use non-fixed IP addresses. , The conventional IP telephone cannot be used. Because of this, I
P-phones are not so popular in reality.

The present invention has been made in consideration of the above circumstances, and even a PC or the like having only a non-fixed IP address can be used as an IP.
It is an object of the present invention to provide an IP telephone server, an IP telephone client and a session establishing method for an internet protocol telephone system made available to a telephone.

[0006]

SUMMARY OF THE INVENTION The present invention is a session establishment method for an internet protocol telephone system that enables a telephone call by exchanging voice data packets between IP telephone clients, the method comprising:
The first IP telephone server, which transmits the call control packet including the IP telephone address of the second IP telephone client as the communication partner from the P telephone client and manages the first IP telephone client, is the first IP telephone server. When the call control packet is received from the IP telephone client, the non-fixed IP address used by the first IP telephone client is retained at least until the communication started by the call control packet ends. And a second IP that manages the call control packet and controls the second IP phone client specified based on the IP phone address included in the call control packet. To the telephone server, and the second IP telephone server receives the call control packet from the first IP telephone server If the non-fixed IP address used by the second IP telephone client specified based on the IP telephone address included in emitting a call control packet,
At least until the communication initiated by the call control packet is completed, a procedure for holding the call control packet is performed, and the call control packet is identified based on the IP telephone address. 2 to the second IP telephone client, and the second IP telephone client
When the call control packet from the second IP telephone server is received, the user is notified of an incoming call in a predetermined form, and if the user gives an instruction to respond to the incoming call, A response packet to the call control packet is transmitted to the first IP telephone client that has transmitted the call control packet.

The present invention is an IP telephone server for enabling a call by exchanging voice data packets between IP telephone clients, which is controlled by the first IP telephone client which is a calling side. , When the call control packet including the IP telephone address of the second IP telephone client as the communication partner is received, the first I
The procedure for holding the non-fixed IP address used by the P telephone client at least until the end of the communication initiated by the call control packet is performed, and the call control packet is First processing means for transmitting to the IP telephone server managing the second IP telephone client specified based on the IP telephone address included in the call control packet, and another IP
The second I from the telephone server, which is the called party managed by itself
The second including the IP telephone address of the P telephone client
When a call control packet to be transferred to another IP telephone client is received, the IP included in the call control packet
Procedure for retaining the non-fixed IP address used by the second IP telephone client specified based on the telephone address at least until the end of the communication initiated by the call control packet And a second processing means for transmitting the call control packet to the second IP telephone client identified based on the IP telephone address.

The present invention is an IP telephone client for exchanging voice data packets with another IP telephone client, and an instruction that a user should make a call and an IP of another IP telephone client that is a communication partner. A means for accepting an instruction of a telephone address, and an instruction to make a call and an IP telephone address of another IP telephone client that is a communication partner, when the instruction is given, the communication partner becomes the instructed communication partner. IP Phone Client IP
Means for sending a call control packet containing a telephone address and receiving a call control packet sent from another IP telephone client including its own IP telephone address and the IP address of the other IP telephone client In this case, when a means for notifying the user of the arrival of an incoming call in a predetermined form, a means for receiving an instruction to respond to the incoming call from the user, and an instruction to respond to the incoming call are given, And a means for transmitting a response packet to the call control packet to the other IP telephone client that has transmitted the call control packet.

[0009] Preferably, the IP telephone address is the IP telephone address within the domain to which the IP telephone client belongs.
You may make it include the 1st information which can identify a telephone client, and the 2nd information which can identify the domain to which the said IP telephone client belongs. Preferably,
The first information of the IP telephone address of the IP telephone client may be information including contents related to a user of the IP telephone client. Preferably, the second information of the IP telephone address of the IP telephone client is the I for managing the IP telephone client in a domain to which the IP telephone client belongs.
It may be the IP address or fully qualified domain name of the P telephone server or the fully qualified domain name of the mail address of the IP telephone client.

It should be noted that the present invention related to the apparatus is established as an invention related to the method, and the present invention related to the method is also established as an invention related to the apparatus. Further, the present invention relating to an apparatus or a method is provided for causing a computer to execute a procedure corresponding to the present invention (or for causing a computer to function as a unit corresponding to the present invention, or for a computer to have a function corresponding to the present invention. It is also realized as a program (for realizing) and as a computer-readable recording medium recording the program.

In the present invention, the call control packet using the IP telephone address is the calling side IP telephone client → the calling side IP telephone server → the called side IP telephone server → the called side IP.
Since it is transferred through the path of the telephone client, it is possible to establish a communication session without using a fixed IP address.
Further, triggered by the call control packet, at least during the conversation period, the non-fixed IP addresses that are leased to both IP telephone clients who hold the conversation are held, and both IP addresses are held.
The phone client will use this (provisionally fixed) IP
You can communicate directly with the address).

According to the present invention, the IP telephone can be used even in a PC having only a non-fixed IP address.
A P telephone system can be realized.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a configuration example of an internet protocol telephone system (IP telephone system) according to an embodiment of the present invention.

The IP telephone server 1 is for providing a service for an IP telephone via the Internet 3, and is provided for each domain (for example, ISP or corporate network). In each domain, D
Various servers such as the HCP server 4 are provided as needed. Note that there may be a domain in which the IP telephone server 1 does not exist.

The IP telephone client 2 is used by the user to make a telephone call with the other party (another IP telephone client) via the Internet 3 by the IP telephone. In the present embodiment, the IP telephone client 2 is the IP telephone client 2. It is assumed that one that receives a lease of an IP address from the DHCP server 14 in the domain to which it belongs and performs TCP / IP communication (that is, one that does not have a fixed IP address).

The IP telephone server 1 can be realized, for example, by mounting software or hardware for the IP telephone server function of this embodiment (in addition to the Internet connection function) on a computer. Further, the software or hardware may be mounted on another server device.

The IP telephone client 2 includes, for example, a personal computer equipped with an internet connection function and an external device such as a handset or a headset (headphone with a microphone) connected thereto, a mobile phone having an internet connection function, and an internet connection function. It can be realized by installing software or hardware for the IP telephone client function of the present embodiment on a stationary telephone having the above.

Although only two domains A and B are shown in FIG. 1, there may actually be other domains having the IP telephone server 1. Further, in FIG. 1, only one IP telephone client 2 is illustrated for one domain, but in reality, there may be a plurality of IP telephone clients 2.

The IP telephone address used in this embodiment will be described.

In this embodiment, the "IP telephone address" is used for each IP telephone client. The format of the IP telephone address is, as illustrated in (a) to (c) of FIG.
(IP address of IP telephone server (in domain to which the client belongs)), (b) "IP telephone client name part @ I (in domain to which the client belongs)
FQDN (Fully Qualified Domain Nam) of P telephone server
e) (fully qualified domain name) ", (c)" IP phone client name part @ (of the client) email address F
QDN "or the like is used.

The IP telephone client name portion (eg, personal ID, user name, other character string, number string, alphanumeric string, etc.) on the left side of @ is used to identify the IP telephone client (or its user). For example, Mr. (for example, amano) or the like is used. The domain part on the right side of @ is for identifying the domain of the ISP or the like to which the IP telephone client belongs,
For example, "○○○ .ne.jp" or the like is used. There is also a method of directly designating the IP address of the server, such as "○○○ .168.0.1" when the IP address of the ISP is known. The IP telephone address is, for example, "amano@○○○.ne.
jp ”and“ amano@○○○.168.0.1 ”.

In the present embodiment, even if the IP address of the other party is unknown, "the name of the other party @ the FQDN of the other party's server"
"N" or "other party name @ other party's server IP address" or "other party name @ other party's email address F"
By specifying any one of "QDN" and the like, it is possible to make an IP phone call.

FIG. 3 shows a configuration example of the IP telephone server 1 of this embodiment. As shown in FIG. 3, the IP telephone server 1 includes a communication interface unit 11 for performing communication via a network and a server processing unit 12 for executing a function as an IP telephone server. Further, as will be described later in detail, the server processing unit 12 sends a packet transfer processing function (121) for performing processing related to packet transfer of a call control packet or the like to the IP telephone client between the DHCP server 4 and the DHCP server 4. An IP address holding function (12) for performing processing related to holding a non-fixed IP address under lease from the server 4 during an IP telephone call (12
2) and I for processing related to IP address resolution
It has functions such as a P address resolution function (123). Note that FIG. 3 mainly shows the portion related to the IP telephone.

FIG. 4 shows a configuration example of the IP telephone client 2 of this embodiment. As shown in FIG. 4, the present IP telephone client 2 includes a communication interface unit 21 for performing communication via a network, an IP telephone processing unit 22 for executing a function as an IP telephone client,
A voice input / output unit 23 for inputting / outputting voice and a user interface unit 24 for presenting information to the user and accepting input from the user are provided. In addition, the IP telephone processing unit 22, as will be described later in detail,
Voice call processing function (221) for performing voice call processing such as voice data packet exchange and voice input / output for the user, and call setting processing function (222) for performing call and incoming call processing and call termination It has a function such as a call termination processing function (223) for performing a process related to. Note that FIG. 4 mainly shows a portion related to the IP telephone.

The DHCP server 4 of this embodiment is
As for the IP telephone client 2 in the domain to which it belongs, as shown in FIG. 5, in response to the inquiry from the IP telephone server 1, the IP address corresponding to the inquired IP telephone client name portion (the IP telephone client name portion). It has a function of returning a leased non-fixed IP address) to an IP telephone client having In addition, the DHCP server 4 responds to the request from the IP telephone server 1 with respect to the IP telephone client 2 in the domain to which the DHCP server 4 has (at least) IPs the leased IP address to the requested IP telephone client 1.
It is assumed to have a function of holding until it receives a releasable notification from the telephone server 1. In this case, the DHCP server 4
For example, as shown in FIG. 6, a table including the correspondence relationship between the IP telephone client name part, the IP address under lease, and the holding flag indicating whether or not the release is possible may be provided (or, for example, , IP phone client name part and NetBIOS correspondence table, NetBIOS
And an IP address correspondence table and an IP address / hold flag correspondence table may be separately provided, or may have another configuration).

In the present embodiment, for example, the following processing is performed in order to realize the IP telephone service. (1) The IP telephone server 1 has a fixed IP address.
The IP telephone server 1 registers the IP telephone address or the IP telephone client name portion of the IP telephone client 2 in the domain to which the IP telephone server 1 belongs. The IP telephone server 1 manages the IP telephone address used in each IP telephone client 2 in the domain to which the IP telephone server 1 belongs so as to keep the IP telephone address unique or the IP telephone client name portion in the domain unique. (For example, the IP telephone client 1 negotiates with the IP telephone server 2 to determine and register the IP telephone client name portion to be used for the IP telephone client 1 (whose uniqueness is guaranteed)). (2) The IP telephone server 1 can negotiate a non-fixed IP address for the IP telephone client 2 with the DHCP server 4 and lease it (via the DHCP server 4). (3) The IP telephone server 1 can issue an IP telephone address to the IP telephone client 2. (4) The IP telephone server 1 can associate the IP telephone address and the IP address under lease with the IP telephone address. (5) When the IP telephone client 2 makes a call to the IP telephone server, the IP telephone server 1 leases the IP address if the IP telephone client 2 does not lease the IP address, accepts the call, and receives the call. To the IP telephone server 1 having the IP telephone address of
The call control packet is sent using the IP address of.
The name of the IP address of the called IP telephone server 1 is resolved by a DNS server, for example, as necessary. (6) I on the called side that received the call control packet from the IP telephone client 2 via the IP telephone server 1 on the calling side
If the P telephone server 1 is leasing an IP address to the IP telephone client 2 having the IP telephone address, the IP telephone
Transfer the call control packet to the address. DHC if IP address is not leased to IP telephone client 2
P server 4 and negotiate (DHCP server 4
Lease (via), and forwards the call control packet to its IP address.

(7) Upon receiving the call control packet, the IP telephone client 2 on the called side issues a physical signal indicating that the packet has been received to notify the incoming call. (8) When a user answers a telephone call, for example, by picking up the handset of the IP telephone client 2, the response packet is sent through the IP telephone server 1 of the called side to the IP side of the calling side.
Sent to the phone client 2, the session is established,
The call starts.

Next, the operation of this embodiment will be described.

FIG. 7 shows an example of a basic sequence of the IP telephone system according to this embodiment.

Here, as illustrated in FIG. 1, the IP telephone client, IP telephone server, and DHCP server on the calling side are described as IP telephone client A, IP telephone server A, and DHCP server A, respectively, and the called side. IP of them
The telephone client B, the IP telephone server B, and the DHCP server B will be described and described.

FIG. 8 shows an example of the processing procedure when the IP telephone client is the calling side. FIG. 9 shows an example of a processing procedure when the IP telephone client is the called side. FIG. 10 shows an example of a processing procedure when the IP telephone server is the calling side. FIG. 11 shows an example of a processing procedure when the IP telephone server is the called side.

(Session Establishment Procedure) (Calling IP Phone Client A) First, when the user of the IP phone client A tries to make an IP phone call to the other party (IP phone client B), the IP phone client A On the other hand, an operation for instructing a call and an operation for designating the IP telephone address of the other party are performed (in addition to the case where the former is performed first, the case where the latter is performed first is also possible) ( IP phone client A accepts this operation) (S31).

In the operation for instructing a call, for example, when the IP telephone client A has a handset or a handset, the user lifts the handset or the like, or a corresponding soft operation (for example, , Press the call button of the software).

In the operation for designating the IP telephone address of the other party, the user inputs the IP telephone address of the other party (IP telephone client B) from the hard key or the soft key, or on the GUI screen, for example. An operation of selecting the IP telephone address of the other party (IP telephone client B) from the presented (previously registered) IP telephone address group is performed. As described above, the IP telephone address may be, for example, "name of the other party @ FQDN of server of the other party" or "name of other party @ IP address of server of the other party" or "name of other party @ FQDN of mail address of the other party". And so on. For example, "amano@○○○.ne.jp" is keyed in or selected from the list.

A configuration is also possible in which the operation for instructing a call and the operation for designating the IP telephone address of the other party are performed at the same time. For example, I registered in advance
By displaying an icon for each P telephone address and double-clicking the icon with the mouse, calling and IP
It is possible to specify the telephone address at the same time.

Upon such operation, the destination IP telephone server having the FQDN or IP address set by the client software or set by the DHCP server is accessed.

That is, IP telephone client A sets the call control packet to IP telephone server transmission A within the same domain (S11, S32). that time. At least the own IP address and / or the own IP telephone address and the IP telephone address of the other party are described in the call control packet (in the case where the own IP address is not described, the IP address of the IP telephone client A). Is I
It may be described in the call control packet at the P telephone server A). In the case of a configuration in which the IP telephone client can send out the call control packet before the IP address is leased, if the IP address is not leased, its own IP address will be included in the call control packet. It is not described (in this case, the IP address of the IP telephone client A may be described in the call control packet by the IP telephone server A).

(IP telephone server A on the calling side, DHCP server A) When the IP telephone server A receives the call control packet transmitted from the IP telephone client A (managed by itself) within the same domain (S51). ), In order to hold (fix) the non-fixed IP address used by the IP telephone client A for the IP telephone until the end of the call, the client name part of the IP telephone address of the other party from the call control packet (for example, "Amano @ ○○○.
ne. “Amano”) in “jp” and D
The client name part is designated to the HCP server A, and the "learned client name part (the corresponding IP telephone client (A in this case)) corresponds to the IP address leased to this (the same). "At least it should be held until a releasable notification packet (including the client name part) is received" (S12, S
52).

Upon receiving this request, the DHCP server A uses the leased IP for the specified client name part.
A process for making the address non-releasable is performed (for example, the holding flag in FIG. 6 is set to the non-releasable state) (S12).

Before the IP address is leased, I
When the P telephone client is capable of transmitting the call control packet, the IP telephone client A
If the IP address is not leased to the IP telephone client A at this point, the DHCP server A
The P address is leased and the above request is made.

The IP telephone server A also performs name resolution based on the IP telephone address of the other party, and
The IP address of the domain to which the P telephone client (here, B) belongs is acquired, and the call control packet including the IP telephone address is transferred to the IP telephone server (here, B) of the IP address (S13, S53).

(Called IP Phone Server B, DHCP Server B) (Called IP Phone Server B) receives the call control packet via the Internet 3 (S6).
1), the destination I described in the call control packet
In order to hold (fix) the non-fixed IP address used by the IP phone client (here, B) having the P phone address until the end of the call, the IP phone address of the other party from the call control packet The client name part of the client is extracted, and the client name part is specified to the DHCP server B, and "the specified client name part (the IP telephone client (B in this case) corresponding to the client name part) is leased to this IP address. Should be held at least until the corresponding releasable notification packet (including the same client name part) is received ”(S14, S62).

Upon receiving this request, the DHCP server B, for the designated client name part,
A process for making the address non-releasable is performed (for example, the holding flag in FIG. 6 is set to the non-releasable state) (S14).

Before the IP address is leased, I
If the P telephone client is capable of sending a call control packet, IP telephone client B
If the IP address is not leased to the IP telephone client B at this point, the DHCP server B
The P address is leased and the above request is made.

Further, the IP telephone server A uses the client name portion of the IP telephone address of this destination as the DH
The IP address leased to the client name part is searched from the CP server B, and the IP address (that is, the IP of the IP telephone client B (managed by itself) is searched.
The call control packet is transferred to the address (S)
15, S63).

(Called IP Phone Client B) When the IP phone client B (Called side) receives the call control packet (S41), for example, it physically receives an incoming melody, blinks light, vibrates, etc. Incoming call is shown to the user by means (and / or by displaying the arrival or the arrival and the information of the calling side) (S4).
2). When the user lifts the handset of the IP telephone client B or performs a considerable operation (when the IP telephone client B receives such an operation by the user) (S43), the IP telephone client B causes the call control to be performed. A response packet to the packet is transmitted to the IP telephone client A on the calling side described in the call control packet (S44). Note that this response packet is an IP
A method for forwarding to the calling IP telephone client A via the telephone server A and / or the IP telephone server B (FIG. 7 exemplifies this case) (S16 to S
18) or a method of directly transferring to the IP telephone client A on the calling side.

The IP address of the IP telephone client B on the called side needs to be notified to the IP telephone client A on the calling side. As a method, the IP telephone server B sends a call control packet. Before or after transfer to the destination IP telephone client B, the method of notifying the IP telephone client A of the calling side or the IP address of the calling side by describing the IP address in the above response packet
A method of notifying the P telephone client A can be considered.

When the response packet arrives at the IP telephone client A on the calling side (S33), a session is established between the IP telephone client A on the calling side and the IP telephone client B on the called side, and a voice call is made. You can make a call.

That is, when the response packet from the called side arrives, the calling side IP telephone client A takes out the IP address of the called side IP telephone client B described in the response packet. Communication is performed using this IP address (or I of the called IP telephone client B notified from the called IP telephone server B).
Communication is performed using the P address). On the other hand, the IP of the called side
The telephone client B communicates using the IP address of the IP telephone client A on the calling side described in the call control packet. Here, for the IP telephone client A on the calling side and the IP telephone client B on the called side,
An IP address that is temporarily fixed (originally non-fixed) is used at least until the end of the call. As a result, after that, both can exchange voice packets with a fixed IP address and can talk.

(Call by IP Phone) In a voice call, when a user of each IP phone client (A or B) utters a voice toward (the microphone part of) the IP phone client (A or B), The IP telephone client (A or B) transmits the voice data packet generated from the input voice to the IP address of the IP telephone client (B or A) which is the other party, and also the IP telephone client which is the other party. (B,
Each IP telephone client (A or B) that has received the voice data packet from A) reproduces the voice data extracted from the voice data packet and outputs the voice from the speaker (S19, S34, S45).

(Session release procedure) An operation for terminating a telephone call by an IP telephone and instructing any of the IP telephone clients (described as A here) to terminate the telephone call, for example, When an operation of placing a handset or the like or an operation equivalent thereto is performed (when the IP telephone client receives such an operation by the user) (S35, S46), the IP telephone client A itself (for example, client software). ) Is initialized (S36, S47), and a call end notification packet is transmitted to both the IP telephone server A in the domain to which it belongs and the IP telephone server B in the domain to which the destination IP telephone client B belongs. (S2
1, S23, S36, S47).

FIG. 7 exemplifies a case where the IP telephone client A side transmits a call end notification packet.
Further, in this case, either S21 or S23 may be performed first (FIG. 7 exemplifies the case where S21 is performed first, and in FIG. 7, S22 and S23 are in no particular order).

In this case, at least the IP telephone address of both IP telephone clients A and B is included in the call termination notification packet of the IP telephone server (for example, A) which is the destination of the call termination notification packet. Describe the IP telephone address of the IP telephone client (for example, A) that belongs to the same domain as the domain to which it belongs (note that
The IP telephone addresses of both IP telephone clients A and B may be described).

It should be noted that the IP telephone clients are both IPs.
Instead of sending a call end notification packet to each telephone server, an IP telephone client (described as A here) that has been operated by the user to instruct the end of the call is sent to IP telephone server A belonging to the same domain. The call termination notice packet may be transmitted, and the IP telephone server A may transmit the call termination notice packet to the IP telephone server B in the domain to which the destination IP telephone client B belongs. In addition, the IP telephone client (described here as A) that has been operated by the user to instruct the termination of the call is the IP telephone server B in the domain to which the destination IP telephone client B belongs.
A call end notification packet to the IP telephone server B
Transmits the call end notification packet to the IP telephone server A belonging to the same domain as the domain to which the IP telephone client A belongs (the operation for instructing the end of the call by the user). Good.

Upon receipt of the call end notification packet (S54, S64), each of the IP telephone servers (A or B) on the calling side and the called side receives the same end domain from the call end notification packet. Extract the client name part of the IP telephone address of the IP telephone client (A or B) that belongs to the domain, and use the DHC within the same domain.
A releasability notification packet including a client name part is transmitted to the P server (A or B), and "the designated client name part (the corresponding IP telephone client)" is sent.
Regarding that the IP address leased to it may be released thereafter ”(S22, S24, S
55, S65).

Each DHC that received the releasable notification packet
Each of the P servers (A or B) performs processing for making the leased IP address in the releasable state for the client name part included in the IP address releasable notification packet (for example, the holding flag in FIG. 6). Is set to a state indicating that it can be released) (S22, S24). After that, the leased IP address is released to the IP telephone client as needed.

For the other IP telephone client (B in the above example) for which the user has instructed the end of the call, the same processing (initialization and transmission of a call end notification packet as described above) is performed. ) May be performed. In this case, since the IP telephone server has already received the call end notification packet, when the IP phone server subsequently receives the call end notification packet, it may discard it. Alternatively, the other IP telephone client B operated by the user to instruct the end of the call
May not transmit the call end notification packet when the end of the session is detected.

As described above, according to this embodiment, even a PC or the like having only a non-fixed IP address has an IP address.
It is possible to realize an IP telephone system that enables telephone use. Further, according to the present embodiment, since the IP telephone client is operated with a non-fixed IP address, it is robust against a DOS (denial of service) attack and the like, and the effect that security can be maintained is also obtained.

By the way, in the above, an IP telephone between IP telephone clients having non-fixed IP addresses has been described. Of course, in the IP telephone system of this embodiment, even if one has a fixed IP address, Phone calls are possible. When the IP telephone client on the calling side has a fixed IP address, for example, the IP telephone client on the calling side uses the IP telephone address of the IP telephone client on the called side to make a call control packet. May be transmitted directly (or via the IP telephone server of the calling side) to the IP telephone server of the called side.
When the called IP telephone client has a fixed IP address, the calling IP telephone client is, for example, the fixed IP of the called IP telephone client.
The calling control packet is transmitted to the calling side IP telephone server by using the address, and the calling side IP telephone server sends the calling control packet directly (or via the called side IP telephone server). ) Send it.

When both sides have a fixed IP address, the calling side sends a direct call control packet using the IP address of the called side, and the called side makes a call as in the conventional case. The response packet may be directly transmitted using the IP address of the side.

In the above description, the voice call is explained, but it is also possible to exchange a still image (for example, a picture of a speaker) or a moving image or other predetermined information along with the voice call. Is.

The application of the present invention is not limited to what has been described so far. For example, if you already have an Internet mail address, you can use that mace address as the IP phone address.
Whether to make an electronic mail or an IP telephone is defined by, for example, the client software used, and thus the protocol used. For example, if you start the mail client software, SMTP, POP, IMA
Negotiation with a mail server is performed by a mail protocol such as P. On the other hand, for example, if the IP telephone client is started, negotiation is started by a protocol between the IP telephone client and the IP telephone server, between the IP telephone servers, and between the IP telephone clients, and the IP telephone address used there is a mail address. The IP address of the IP telephone server can be specified, and the name of the IP telephone client can be specified in the server.

Each of the above functions can be realized as software. Further, the present embodiment can be implemented as a program for causing a computer to execute a predetermined means (or for causing a computer to function as a predetermined means or for causing a computer to realize a predetermined function). It can also be implemented as a computer-readable recording medium recording the program.

The configuration illustrated in the embodiment of the present invention is an example, and is not intended to exclude other configurations, and a part of the illustrated configuration may be replaced with another configuration or illustrated. Other configurations that are obtained by omitting a part of the configuration, adding another function or element to the exemplified configuration, or combining them are possible. Also, another configuration logically equivalent to the exemplified configuration,
Other configurations including a portion logically equivalent to the exemplified configuration, another configuration logically equivalent to the main part of the exemplified configuration, and the like are possible. Further, another configuration that achieves the same or similar purpose as the exemplified configuration, another configuration that achieves the same or similar effect as the exemplified configuration, and the like are possible. Further, various variations of the various constituent parts illustrated in the embodiments of the present invention can be implemented in an appropriate combination. Further, the embodiments of the present invention include an invention as an individual device, an invention as to two or more related devices, an invention as an entire system, an invention as to a component inside an individual device, or a method corresponding thereto. It is intended to encompass and include inventions related to various viewpoints, stages, concepts or categories such as inventions. Therefore, the invention disclosed in the embodiments of the present invention can be extracted without being limited to the exemplified configurations.

The present invention is not limited to the above-described embodiments, but can be implemented with various modifications within the technical scope thereof.

[0067]

According to the present invention, it is possible to realize an IP telephone system in which an IP telephone can be used even in a PC having only a non-fixed IP address.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of an internet protocol telephone system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a format example of an IP telephone address according to the embodiment.

FIG. 3 is a diagram showing a configuration example of an IP telephone server according to the embodiment.

FIG. 4 is a diagram showing a configuration example of an IP telephone client according to the embodiment.

FIG. 5 is a diagram for explaining a DHCP server according to the same embodiment.

FIG. 6 is a diagram for explaining a DHCP server according to the same embodiment.

FIG. 7 is a diagram showing a sequence example of the Internet protocol telephone system according to the embodiment.

FIG. 8 is a flowchart showing an example of a processing procedure when the IP telephone client according to the embodiment becomes a calling side.

FIG. 9 is a flowchart showing an example of a processing procedure when the IP telephone client according to the embodiment becomes a called side.

FIG. 10 is a flowchart showing an example of a processing procedure when the IP telephone server according to the embodiment becomes a calling side.

FIG. 11 is a flowchart showing an example of a processing procedure when the IP telephone server according to the embodiment becomes a called side.

FIG. 12 is a diagram for explaining a conventional Internet protocol telephone system.

[Explanation of symbols]

1 ... IP telephone server 2 ... IP phone client 3 ... Internet 4 ... DHCP server 11, 21 ... Communication interface section 12 ... Server processing unit 22 ... IP phone processing unit 23 ... Voice input / output section 24 ... User interface section

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tatsuya Koretsu             1st Komukai Toshiba-cho, Sachi-ku, Kawasaki-shi, Kanagawa             Inside the Toshiba Research and Development Center (72) Inventor Toshiya Takahashi             1st Komukai Toshiba-cho, Sachi-ku, Kawasaki-shi, Kanagawa             Inside the Toshiba Research and Development Center (72) Inventor Shozo Isobe             1st Komukai Toshiba-cho, Sachi-ku, Kawasaki-shi, Kanagawa             Inside the Toshiba Research and Development Center (72) Inventor Toru Imai             1st Komukai Toshiba-cho, Sachi-ku, Kawasaki-shi, Kanagawa             Inside the Toshiba Research and Development Center F-term (reference) 5K030 HA08 HB01 HB16 HC14 HD08                       HD09 JT01 LB01                 5K051 AA08 BB01 DD01 DD13 GG01                       GG03                 5K101 LL01 PP03 SS07 SS08

Claims (21)

[Claims] 1. A method for establishing a session for an internet protocol telephone system, which enables a telephone call by exchanging voice data packets between IP telephone clients, wherein a first IP telephone client becomes a communication partner. Second
A first IP for transmitting a call control packet including the IP telephone address of the second IP telephone client, and managing the first IP telephone client
When the telephone server receives the call control packet from the first IP telephone client, the telephone server terminates at least the non-fixed IP address used by the first IP telephone client, which is started by the call control packet. The second IP telephone client, which performs a procedure for holding the call control packet, is specified based on the IP telephone address included in the call control packet. To the second IP telephone server managing the IP address, the second IP telephone server, when receiving the call control packet from the first IP telephone server, the second IP telephone server includes the IP included in the call control packet. The non-fixed IP address used by the second IP telephone client specified based on the telephone address is at least the call control packet. The call control packet is transmitted to the second IP telephone client specified based on the IP telephone address, while the procedure for holding the communication is started until the communication started by Transmitting, the second IP telephone client receives the call control packet from the second IP telephone server,
When the user is informed of an incoming call in a predetermined form, and the user gives an instruction to respond to the incoming call, a response packet to the outgoing call control packet is sent, and a response packet to the outgoing call control packet is sent. A method for establishing a session, which comprises transmitting to a first IP telephone client. 2. I for enabling a call by exchanging voice data packets between IP telephone clients.
In the P telephone server, when a call control packet including the IP telephone address of the second IP telephone client that is the communication partner is received from the first IP telephone client that is the caller side managed by itself, A procedure for holding the non-fixed IP address used by the first IP telephone client at least until the end of the communication initiated by the call control packet is performed, and the call control is performed. A first processing means for transmitting a packet to an IP telephone server managing the second IP telephone client specified based on the IP telephone address included in the call control packet; and another IP telephone. From the server to the second IP telephone client that includes the IP telephone address of the called second IP telephone client managed by itself When receiving the Okusu should call control packet, a non-fixed IP address used by the second IP telephone client that is identified based on the IP telephone address included in emitting a call control packet,
At least until the communication initiated by the call control packet is completed, a procedure for holding the call control packet is performed, and the call control packet is identified based on the IP telephone address. An IP telephone server, comprising: a second processing unit for transmitting to the second IP telephone client. 3. The IP telephone address of the IP telephone client makes it possible to identify the IP telephone client in a domain to which the IP telephone client belongs.
3. The IP telephone server according to claim 2, wherein the IP telephone server includes the information of 1) and second information that enables identification of the domain to which the IP telephone client belongs. 4. The IP telephone according to claim 3, wherein the first information of the IP telephone address of the IP telephone client is information including contents related to a user of the IP telephone client. server. 5. The second information of the IP telephone address of the IP telephone client is the IP address or fully qualified domain name of the IP telephone server that manages the IP telephone client in the domain to which the IP telephone client belongs, or The IP telephone server according to claim 3, wherein the IP telephone server is a fully qualified domain name of the mail address of the IP telephone client. 6. The second processing means, when transferring the calling control packet to the second IP telephone client, which is a called side managed by itself, to the second IP telephone client. By inquiring the non-fixed IP address leased from the DHCP server of the same domain to the DHCP server based on the first information included in the IP telephone address included in the received call control packet. The IP telephone server according to claim 3, wherein the IP telephone server is obtained. 7. The first processing means is used by the first IP telephone client when it receives a call end notification packet relating to the first IP telephone client, which is a calling side managed by itself. A procedure for making the non-fixed IP address releasable is performed, and the second processing means receives a call end notification packet related to the second IP telephone client which is a called side managed by itself. In a case, the procedure for making the non-fixed IP address used by the second IP telephone client releasable is performed.
P telephone server. 8. The procedure for each of the first processing means and the second processing means to hold the non-fixed IP address by negotiating with a DHCP server of the same domain. The IP telephone server according to claim 7, wherein the IP telephone server performs a procedure for enabling the release. 9. The first I, which is a caller controlled by itself,
A non-fixed I used by the first IP telephone client for the call control packet received from the P telephone client.
The IP telephone server according to claim 1, wherein a P address is set and transferred. 10. The IP of the calling side that has transmitted the calling control packet when the calling control packet is transferred to the second IP telephone client which is the called side managed by itself.
The IP telephone server according to claim 1, wherein the telephone client is notified of a non-fixed IP address used by the second IP telephone client. 11. An IP telephone client for exchanging voice data packets with another IP telephone client, an instruction to call from a user, and an IP telephone address of another IP telephone client as a communication partner. Means for accepting the instruction, and the instruction to call and the other IP as the communication partner.
Means for transmitting a call control packet including the IP telephone address of the other IP telephone client to be the instructed communication partner when the instruction of the IP telephone address of the telephone client is given, and the other IP telephone client Own IP sent from
Telephone address and IP of the other IP telephone client
When a call control packet including an address is received, means for notifying the user of the arrival of the incoming call in a predetermined form, means for accepting an instruction to respond to the incoming call from the user, and Means for transmitting a response packet to the call control packet to the other IP telephone client that has transmitted the call control packet when an instruction to respond is given. IP phone client. 12. The IP telephone address of the IP telephone client can specify first information for identifying the IP telephone client in a domain to which the IP telephone client belongs and a domain to which the IP telephone client belongs. 12. The IP telephone client according to claim 11, further comprising: 13. The IP telephone according to claim 12, wherein the first information of the IP telephone address of the IP telephone client is information including contents related to a user of the IP telephone client. client. 14. The second information of the IP telephone address of the IP telephone client is the IP address or fully qualified domain name of the IP telephone server that manages the IP telephone client in the domain to which the IP telephone client belongs, or the relevant information. 13. The IP telephone client according to claim 12, wherein the IP telephone client is a fully qualified domain name of the mail address of the IP telephone client. 15. The IP telephone client according to claim 11, wherein a non-fixed IP address used by itself is set and transmitted in the call control packet. 16. The IP telephone client according to claim 11, wherein a non-fixed IP address used by the response packet is set and transmitted in the response packet. 17. The call end notification packet for notifying the end of a call is issued when a user gives an instruction to end communication with the other IP telephone client. IP phone server. 18. A session establishment method for an internet protocol telephone system that enables a telephone call by exchanging voice data packets between IP telephone clients, the method being a caller controlled by the first telephone. When a call control packet including the IP telephone address of the second IP telephone client as the communication partner is received from the IP telephone client, at least the non-fixed IP address used by the first IP telephone client is received. A procedure for holding until the communication started by the call control packet is completed is performed, and the call control packet is based on the IP telephone address included in the call control packet. To the IP telephone server that manages the second IP telephone client specified by When a call control packet to be transferred to the second IP telephone client, which includes the IP telephone address of the called second IP telephone client managed by the telephone server, is received from the telephone server, the call control packet is transmitted. A non-fixed IP address used by the second IP telephone client specified based on the IP telephone address included in the call control packet is retained at least until the communication started by the call control packet ends. And the call control packet is sent to the IP.
A method for establishing a session, which comprises transmitting to the second IP telephone client identified based on a telephone address. 19. A session establishment method for an internet protocol telephone system, which enables a telephone call by exchanging voice data packets between IP telephone clients, comprising an instruction that a user should call and a communication partner. If the IP telephone address of another IP telephone client to be the communication destination is given, the other IP to be the designated communication partner
A call control packet containing the IP telephone address of the telephone client is sent, and the own IP sent from another IP telephone client
Telephone address and IP of the other IP telephone client
When a call control packet including an address is received, the user is notified of the arrival of a call in a predetermined form, and if the user gives an instruction to respond to the call, a response to the call control packet is sent. A session establishing method comprising: transmitting a packet to the other IP telephone client that has transmitted the call control packet. 20. A program for causing a computer to function as an IP telephone server for enabling a call by exchanging voice data packets between IP telephone clients, the program being a calling side managed by itself. When a call control packet including the IP telephone address of the second IP telephone client that is the communication partner is received from the first IP telephone client, at least the non-fixed IP address used by the first IP telephone client is A procedure for holding until the communication started by the call control packet is completed is performed, and the call control packet is based on the IP telephone address included in the call control packet. For transmitting to the IP telephone server managing the second IP telephone client specified by And a call control packet to be transferred to the second IP telephone client including the IP telephone address of the called second IP telephone client managed by itself from another IP telephone server. , A non-fixed IP address used by the second IP telephone client specified based on the IP telephone address included in the call control packet,
At least until the communication initiated by the call control packet is completed, a procedure for holding the call control packet is performed, and the call control packet is identified based on the IP telephone address. A program for causing a computer to realize a function for transmitting to the second IP telephone client. 21. A program for causing a computer to function as an IP telephone client for exchanging voice data packets with another IP telephone client, the instruction indicating that a user should make a call, and the other party. A function for accepting an instruction of the IP telephone address of the IP telephone client, and the other IP as the communication partner
When an instruction of the IP telephone address of the telephone client is given, a function for transmitting a call control packet including the IP telephone address of the instructed other IP telephone client to be the communication partner, and another IP telephone client Own IP sent from
Telephone address and IP of the other IP telephone client
When a call control packet including an address is received, a function for notifying the user that there is an incoming call in a predetermined form, a function for accepting an instruction to respond to the incoming call from the user, and a function for receiving the incoming call A program for causing a computer to realize a function of transmitting a response packet to the call control packet to the other IP telephone client that has transmitted the call control packet when an instruction to respond is given. .