JP2003143320A - Method for reaching incoming call to ip terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for reaching an incoming call to an IP terminal that reaches an incoming call to the IP terminal under the management of a LAN via the Internet. SOLUTION: A caller side makes a call to a prescribed called party IP terminal 31 via a switch network 21, makes a call to the Internet 23 to acquire a global address, the called party receives the call from the caller and makes a call to the Internet 23 top acquire the global address, transmits the acquired called party global address and a private address assigned to the prescribed IP terminal on the LAN to the caller via the switch network 23, the caller side receives the global address and the private address from the called party to interrupt the connection to the switch network 23, and reaches the incoming call to the prescribed IP terminal 31 via the Internet 23 on the basis of the received global address and private address of the called party.

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a method for receiving an incoming call to an IP terminal under a LAN connected to the Internet via a router or a gateway. 2. Description of the Related Art Conventional analog telephones or ISDN
The telephone number of the telephone is assigned to the telephone line, that is, the subscriber line, rather than to the terminal telephone.
Therefore, even if the telephone is replaced, an incoming call can be received as it is. [0003] On the other hand, the IP address of the IP terminal on the Internet is given to the terminal itself from an ISP (Internet connection operator) instead of a line.
Moreover, the global address is often dynamically and variably assigned when the terminal is started. This is equivalent to always changing the number of the terminal, so that for a given I
In order to make the P terminal receive a call unambiguously, it is necessary to take some means. [0004] Such a method of receiving an incoming call to an IP terminal on the Internet is disclosed in, for example, JP-A-2001-94609.
According to the publication, first, an outgoing channel of the ISDN line is used to make a call to the other party's IP terminal once, to have the other party's IP terminal notify the IP address, and then to use the notified other party's IP address again via the Internet There has been proposed a dial-up terminal connection system for receiving a call. [0005] By the way, particularly in business offices and the like, a plurality of IP terminals having private addresses are often accommodated on a LAN connected to the Internet via a router or a gateway. In this case, since the global IP address is given to the router or the gateway, the IP terminal of the private address cannot be specified only by the global address. [0006] There is no mention of such an incoming call to an IP terminal under the LAN in JP-A-2001-94609. SUMMARY OF THE INVENTION Accordingly, an object of the present invention, which has been made in view of the above, is to provide a method of receiving an IP terminal under a LAN via the Internet. According to a first aspect of the present invention, there is provided a method for receiving an incoming call to an IP terminal, wherein the method is connected to a LAN via a router or a gateway, and connected to the Internet or to a digital or analog device. When an incoming call is made to a predetermined IP terminal capable of telephone communication via the Internet, a call is made from a calling side to a predetermined IP terminal on a called side via a switching network, and a call is made to the Internet to make a global call. After receiving the address from the calling side, the receiving side makes a call to the Internet to obtain a global address, and then obtains the obtained global address of the called side and the predetermined IP terminal on the LAN. The assigned private address is transmitted to the caller via the exchange network, and the caller receives the private address from the caller. Receiving the global address and the private address, disconnecting the connection to the switching network, and making a call to the predetermined IP terminal via the Internet based on the received destination global address and private address. Is what you do. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for receiving a call to an IP terminal according to the present invention will be described below with reference to FIGS. FIG. 1 is a diagram showing an example of a relay network capable of implementing the present invention, FIG. 2 is a sequence diagram for explaining the operation, and FIGS. 3 and 4 are diagrams showing an example of inserting a private address into a voice packet. It is. In FIG. 1, a group A includes a plurality of IP terminals connected to a LAN, here, two IP telephones (Te
1) 11 and 12, a gatekeeper (GK) 13 for assigning and managing private addresses to these IP telephones 11 and 12 and managing correspondence between IP telephone numbers and private addresses, and connection and connection between WAN side and LAN side. And a router (R) 14 for relaying. In some cases, a call manager having the same function may be used instead of the gatekeeper 13, and a gateway having the same function may be used instead of the router 14. The router 14 is connected to an exchange (LS) (not shown) via a subscriber line 15 and can be connected to an exchange network 21 via the exchange.
It is possible to connect to the Internet 23 via a P (Internet connection service provider) 22, so that the IP telephones 11 and 12 can perform digital or analog telephone communication together with the Internet connection. On the other hand, Group B is similar to Group A,
LAN-connected IP telephones 31, 32,
A gatekeeper 33 for assigning and managing private addresses to the telephones 31 and 32 and managing correspondence between IP telephone numbers and private addresses;
And a router 34 for connection / relay to the switching side. The router 34 is connected to an exchange (not shown) via the router 34 and the subscriber line 35 so as to be connectable to the exchange network 21, and from the exchange via the ISP 24. It is possible to connect to the Internet 23, so that the IP telephones 31 and 32 can perform digital or analog telephone communication together with the Internet connection. The Internet connection and digital or analog telephone communication via the subscriber lines 15 and 35 are performed by a transmission method such as ADSL, VoDSL, or ISDN. Next, with regard to the method of receiving a call to the IP terminal according to the present embodiment in the relay network shown in FIG. 1, a call is received from the group A IP telephone 11 to the group B IP telephone 31 via the Internet 23. An example will be described with reference to the sequence diagram of FIG. The IP telephone 11 is a destination IP telephone 31.
Since the global address and private address of the IP telephone 31 are unknown, first, the telephone number of the IP telephone 31 is dialed to make a call via the switching network 21 accommodating the exchange (LS), and the ISP 22 connected to the Internet 23. Is called to obtain an IP address. Note that, when a call is made via the switching network 21, the subscriber line 1
In the case where ISDN lines 5 and 35 are used, the D channel is used. If the IP telephone 31 has an extension number, the extension number (sub address) is transmitted together with the external number (address) in the ISDN transmission method, and the extension number is dialed in the ADSL or VoDSL transmission method. Later dial as additional number. On the other hand, the receiving side receives the connection request from the calling side and synchronizes with the
A call is made to the SP 24 to obtain an IP address, and thereafter, the IP address as the obtained global address (GA address) and the private address (PA) of the IP telephone 31 managed by the gatekeeper 33.
Address) and a modem signal, PB
It is transmitted to the calling side by a signal or by using the D channel of ISDN. Thereafter, upon receiving the destination address, the caller disconnects the connection to the switching network 21, makes an Internet call based on the received GA address and PA address of the IP telephone 31, and sends the IP telephone 31 the Internet 23. A call is received via the Internet, and when a response is received, a call can be made between the IP telephones 11 and 31 by voice packets via the Internet 23. In a voice packet communication, the other party's PA address is stored in an extension header in the RTP data area of the voice packet as shown in FIG. 3, for example.
Alternatively, as shown in FIG. 4, it is stored at the beginning of the audio data of the audio packet. As described above, according to the present invention, a call is made from the calling side to a predetermined IP terminal under the LAN of the called side via the switching network, so that the called side can call the terminal. A call is made to the Internet to obtain a global address, and the obtained global address of the called side and a private address assigned to a predetermined IP terminal are transmitted to the calling side via the switching network. Even if the global address is changed for each connection to the LAN, a predetermined IP address under the LAN is determined based on the global address and the private address transmitted from the called side.
An incoming call can be made to the terminal, so that a voice packet call can be made via the Internet.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an example of a relay network capable of implementing a method for terminating an IP terminal according to the present invention. FIG. 2 is a sequence diagram for explaining an incoming call operation in the relay network shown in FIG. 3 and 4 are diagrams showing examples of inserting a private address into a voice packet. FIG. 3 is a diagram illustrating an example of a manner of inserting a private address into a voice packet. FIG. 4 is a diagram showing another example. [Description of Signs] 11, 12, 31, 32 IP telephone (Tel) 13, 33 Gatekeeper (GK) 14, 34 Router (R) 15, 35 Subscriber line 21 Switching network 22, 24 ISP (Internet connection operator) 23 Internet

Continuation of front page    F term (reference) 5K033 BA14 CB01 CB09 DA06 EC03                 5K051 AA05 BB01 BB02 CC01 CC02                       DD01 DD03 EE01 HH27 JJ13                 5K101 KK02 LL01 LL05 PP03 SS07                       TT01

Claims (1)

Claims: 1. An LA via a router or gateway
N, when a call is received via the Internet to a predetermined IP terminal capable of performing digital or analog telephone communication together with the Internet connection, the call originates from the calling side to the predetermined IP terminal on the called side via the switching network. At the same time as making a call, calling the Internet to obtain a global address, receiving the call from the calling party, calling the Internet and obtaining a global address, and then obtaining the global address of the called party An address and a private address assigned to the predetermined IP terminal on the LAN are transmitted to the calling side via the switching network, and the calling side receives a global address and a private address from the called side. To disconnect the connection to the switching network, and Incoming method to the IP terminal via the Internet, characterized in that performing paging to the predetermined IP terminal based on Lee sorbate address.