KR100383583B1 - Method for auto routing of proxy of session initiation protocol - Google Patents

Abstract

It is published about proxy auto routing method in SIP. Proxy auto-routing method in SIP according to the present invention comprises the steps of: a SIP server of the mobile domain to which the user has moved to check whether the user is a new user by analyzing the register message received from the user; If the user is identified as a newly moved user, adding registration information of the user and extracting a home domain address of the user;

Extracting a SIP server address of the home domain from the extracted home domain address; And transmitting a register message to the extracted SIP server address of the home domain so that the registration information of the user registered in the home domain of the user is updated.

Therefore, according to the automatic routing method in SIP according to the present invention, firstly, when a user moves between domains, there is no need to directly update his registration information. Second, the user can simplify the movement path of the invite message by directly updating his registration information existing in the home domain without going through the mobile domain through which he / she has passed.

Description

Proxy automatic routing method in SIP {METHOD FOR AUTO ROUTING OF PROXY OF SESSION INITIATION PROTOCOL}

The present invention relates to a proxy autorouting method in SIP. More particularly, when a user moves a domain, a SIP server of a newly moved mobile domain is assigned to a SIP server of a user's home domain on behalf of the user. It is directed to a proxy auto-routing method in SIP that sends a message so that the user's current location is automatically registered.

In recent years, information and communication technologies centered on networks have been rapidly developed. The information communication technology is moving away from the technology of transmitting only data and transmitting video and voice together. Such a technology for enabling voice communication in a data network is called VoIP (Voice over Internet Protocol). In other words, VoIP is a protocol that enables voice and video communication using a packet switched network, which is a relatively inexpensive and efficient IP network, instead of a circuit switched network called a telephone network. Representative protocols of the VOIP include SIP and H.323.

Here, the SIP protocol system is comprised of a user terminal, a proxy server, a registration server, and the like.

The proxy server is a server having a concept similar to that of a router in an IP network, and when a sender terminal attempts to make a call to a receiver terminal, the proxy server transmits a message for establishing a connection between the sender terminal and the receiver terminal. In this case, the proxy server is located at the same physical location as the registration server and serves to deliver a call setup message from the sender terminal to the receiver terminal based on the location on the SIP network of the receiver terminal registered with the registration server.

The registration server is a server where the user terminal registers its current location on the SIP network.

The registration server and the proxy server physically exist in one device and are called SIP servers. The range controlled by the SIP server is called a domain on the SIP network. In this case, the domain does not represent any specific address but represents a range of addresses. Thus, the SIP server governs a range of specific addresses.

Meanwhile, a domain to which the user terminal belongs basically is called a home domain, and the user terminal may change a domain address to which the user terminal belongs.

The user has a unique ID that is not changed besides the variable current address (the address that accesses the user if the user changes the domain on the IP network). The unique ID is a value obtained by adding a specific string to an address string of the user's home domain.

In addition, the SIP server also has an address like the user terminal, and the exact address of the SIP server existing in the domain "A.B.C" is generally sip A.B.C.

Meanwhile, the SIP protocol exchanges predetermined information through messages such as INVITE and REGISTER. In this case, the invite message is to send an invitation message to the receiver terminal, and the register message is a message in which the receiver terminal registers its address information in the registration server.

In the SIP protocol as described above, as soon as the user terminal is driven, a multicast register message, which is a message that registers its location to the SIP server of the domain to which it belongs, is transmitted to the SIP server of the domain currently staying. Let yourself be registered. At this time, when the user is registered in the register server, his own ID and his current address are registered together.

Next, when the sender terminal intends to communicate with the receiver terminal, a process in which the sender terminal communicates with the receiver terminal is divided into a receiver terminal that does not move the home domain and a receiver terminal that moves the home domain.

First, a process of sending an invite message to a receiver terminal that does not move a home domain is as follows.

The sender sends a predetermined invite message to the SIP server to which the receiver with the home domain A.B.C. belongs. The invite message has a receiver's ID as a field.

In this case, the SIP A.B.C. The SIP server with the address of the receiver has the ID of the receiver included in the invite message and extracts the address of the receiver matching with it. Thus, the invite message is Sip A.B.C. It is sent to the recipient's address by a SIP server with the address

The following describes a conventional method for making a call with a recipient whose domain has been moved.

For example, the sender confirms that the recipient's home domain address is A.B.C. from the ID of the recipient to communicate with.

In this case, the sender checks the address of the SIP server sip.A.B.C from the receiver's home domain, and sends an invite message containing the receiver's ID as a field to sip.A.B.C. At this time, the sip.A.B.C checks the ID of the receiver in the invite message and checks whether there is an address of the receiver matching with the receiver. As a result of the check, when the recipient moves to the domain address of D.E.F., the sip.A.B.C shows sip. Find a SIP server called D.E.F.

Meanwhile, the receiver accesses the sip.A.B.C. and updates his location information.

The sip.A.B.C then provides the invite message to a SIP server called sip.D.E.F.

Then, the sip.D.E.F. receives the invite message, detects the current position of the receiver according to the address of the receiver included in the field of the invite message, and transmits the invite message to the receiver's current address.

As described above, the conventional proxy routing method in SIP is very inconvenient in a mobile environment because the user has to update his registration information to the SIP server of his home domain every time the user moves the domain.

In addition, the invite message has a problem in that the call routing path is complicated because the invite message can pass through all SIP servers passed by the user according to the movement path of the user domain.

In order to effectively solve the above problems of the prior art, when a user moves to another domain, the SIP server of the mobile domain to which the user moves moves the SIP address of the user's home domain through a register message received from the user. In the SIP to identify and send a register message including the user's ID and the address of his domain to the SIP server of the user home domain to automatically register the mobile domain moved by the user to the SIP server of the home domain. Its purpose is to provide a proxy autorouting method.

1 is a diagram illustrating registration information of a general SIP server.

2 is a flowchart illustrating a proxy auto routing method in SIP according to an embodiment of the present invention.

3 is a diagram illustrating a proxy auto routing system in SIP according to an embodiment of the present invention.

<Description of reference numerals appearing in the drawing>

100: user (UA A) 110: home domain

120: recipient (UA B) 130: mobile domain

According to an aspect of the present invention, there is provided a method, comprising: checking, by a SIP server of a mobile domain, to which a user has moved, analyzing a register message received from the user to determine whether the user has been newly moved;

If the user is identified as a newly moved user, adding registration information of the user and extracting a home domain address of the user;

Extracting a SIP server address of the home domain from the extracted home domain address;

And transmitting a register message to the extracted SIP server address of the home domain so that the registration information of the user registered in the home domain of the user is updated.

Hereinafter, with reference to the accompanying Figures 1 to 3 will be described in detail with respect to the automatic routing method in SIP according to an embodiment of the present invention.

1 is a diagram illustrating registration information of a general SIP server.

As shown in FIG. 1, information about a user terminal registered in a SIP server is tabulated.

First, the first tuple is when the user's home domain matches the current domain. In this case, the address information in the routing address field is not the domain information but the actual address information of the user.

The second tuple is when the home domain and the current domain do not match. In this case, the home domain is on the SIP server, but the current location is not on the home domain but in a mobile domain with a different address. In this case, the address information in the routing address field is mobile domain address information.

In the third tuple, when a user whose home server's SIP server address is G.H.I moves to a domain whose SIP server address is A.B.C., the routing address becomes the real address, not the domain address.

2 is a flowchart illustrating a proxy auto routing method in SIP according to an embodiment of the present invention.

As shown in FIG. 2, in the automatic proxy routing method in SIP according to the present invention, when a user moves from his or her home domain, the user moves to a SIP server of the newly moved mobile domain through a register message. Registers the current location to the user (S200).

Then, the SIP server of the mobile domain analyzes the register message to determine whether the user is a user belonging to its own home domain or a user who has moved from another domain (S210).

In this case, when the user is a user who has moved from another domain, the SIP server of the mobile domain adds user registration information through a register message received from the user (S220).

Then, the SIP server of the mobile domain finds the user's home domain address from the user's ID (S230), and finds the SIP server address of the user's home domain from the domain address in the user's ID (S240).

Then, the SIP server of the mobile domain registers the current location of the user by transmitting a register message to the SIP server of the user home domain on behalf of the user (S250). In this case, the SIP server of the mobile domain transmits a register message to the SIP server of the user home domain regardless of the domain of the user's previous path. In this case, the address information for the user stored in the SIP server of the user's previous route domain is naturally extinguished over time according to the basic specification definition of the SIP protocol.

On the other hand, in the determination step (S210), if the user belongs to his home domain, the registration information of the user is updated (S260).

3 is a diagram illustrating a proxy auto routing system in SIP according to an embodiment of the present invention.

Hereinafter, a communication method between a sender and a receiver using a proxy auto routing system in SIP will be described.

As shown in FIG. 3, when a sender (UA A; 100) wants to communicate in a proxy autorouting system in SIP, a receiver home domain is identified using an ID of a receiver (UA B; 120) that is known to the recipient. After the SIP server address is obtained, an invite message is transmitted to the SIP server (sip.ABC) 110 of the receiver home domain.

In this case, the SIP server 110 of the receiver home domain checks the registration information of the receiver 120 to which the sender 100 intends to transmit the invite message. In addition, when the sender terminal 100 is present in its home domain, the invite message is directly transmitted to the receiver terminal 120, thereby ending the corouting.

On the other hand, when the receiver 120 moves from the home domain 110 to another domain (sip.DEF; 130), the SIP server 130 of the mobile domain receives the receiver on behalf of the user in the manner shown in FIG. The register message including the ID of the user and the domain address of the user is transmitted to the SIP server 110 of the home domain, thereby updating the registration information of the receiver 120 in the SIP server 110 of the home domain.

Accordingly, the SIP server 110 of the receiver home domain transmits the invite message to the SIP server 130 of the mobile domain in which the receiver 120 is currently located according to the updated registration information.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. . Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, according to the automatic routing method in SIP according to the present invention,

First, users do not have to update their registration information when they move between domains.

Second, the user can simplify the movement path of the invite message by directly updating his registration information existing in the home domain without going through the mobile domain through which he / she has passed.

Claims (4)

Checking, by the SIP server of the mobile domain to which the user has moved, analyzing the register message received from the user to determine whether the user has been newly moved; If the user is identified as a newly moved user, adding registration information of the user and extracting a home domain address of the user; Extracting a SIP server address of the home domain from the extracted home domain address; And transmitting a register message to the extracted SIP server address of the home domain so that the registration information of the user registered in the home domain of the user is updated. The method of claim 1, And when the invite message of the home domain of the user is received, transmitting the invite message to a SIP server of the mobile domain in which the user is currently located. The method of claim 1, And wherein the register message includes a user ID and an address of a home domain. The method of claim 1, And the home domain of the user is extracted using the ID of the user.