KR20050083428A - Sip routing system and method in next generation network - Google Patents

Abstract

The present invention discloses a SIP routing system and its routing method in a next generation network.

The SIP routing system of the present invention manages routing information for subscriber stations accommodated in a next-generation network, and informs routing information about a corresponding subscriber station upon receiving a routing query requesting a location for specific destination subscriber stations. Routing server; An outgoing soft switch having a unique domain and transmitting the routing query to the routing server when receiving a call connection request message for the specific called subscriber terminal and receiving the routing information and performing call control according to the provided routing information; And a receiving soft switch having a unique domain and searching for the specific subscriber station accommodated by the user through number translation when receiving a call connection request message from the calling soft switch, and performing a call connection. By connecting different addressing schemes, the call connection is performed to guarantee the number portability of the subscriber station in the NGN network and to prevent unnecessary interworking with the routing server to improve network performance.

Description

Session initiation protocol routing system in next generation network and its routing method {SIP routing system and method in next generation network}

The present invention relates to a SIP (Session Initiantion Protocol) routing system and a routing method between soft switches in a Next Generation Network (NGN), and more specifically, to an existing telephone number system (E.164) and an Internet address ( The present invention relates to a SIP routing system and a routing method for easily connecting a call between subscribers without relying on a specific addressing method by combining a phone number system and an Internet address system in a next-generation network in which an email address) method is mixed.

NGN integrates all communication networks such as general telephone network, asynchronous transmission method (ATM), frame relay, dedicated network, and wireless communication network into a packet-based common network to reduce network construction cost and operation cost, as well as flexible and open network solution. It is an integrated voice and data network to provide various applications.

The biggest feature of NGN is integration and packetization. It can accommodate voice, data, and video at the same time and can efficiently provide various additional services such as internet phone and multimedia messaging. In addition, by disassembling, assembling and assembling multiple traffic packets into one communication line at the same time, the line efficiency is greatly improved, and the voice telephone service can be provided at a very low price compared to the conventional method.

However, in this NGN, the call connection process between subscribers using the existing public network telephone numbering system and the call connection process between subscribers using the Internet address system are independent of each other. There is no international standardization or recommendation.

Accordingly, an object of the present invention is to provide subscribers accommodated in a next generation network by providing a routing method that can easily connect a call between subscribers without being limited to a specific addressing method by integrating a telephone number system and an Internet address system in a next generation network. It ensures number portability and improves network performance by reducing network load due to call connection.

In order to achieve the above object, a SIP routing system in a next generation network of the present invention manages routing information for subscriber stations accommodated in a next generation network, and receives a routing query requesting a location for specific destination subscriber stations. A routing server for informing routing information about the called subscriber station; An outgoing soft switch having a unique domain and transmitting the routing query to the routing server when receiving a call connection request message for the specific called subscriber terminal and receiving the routing information and performing call control according to the provided routing information; And a called soft switch having a unique domain and searching for the specific subscriber station accommodated by the user through number translation when receiving a call connection request message from the calling soft switch.

In the SIP routing method in the next-generation network of the present invention, a routing server that manages routing information of subscriber stations accommodated in the next-generation network when an outgoing soft switch receives a call connection request message to a called subscriber station is located at the called subscriber station. A first step for requesting information; A second step of the routing server retrieving routing information for the called subscriber station and notifying the calling soft switch according to the location information request; And a third step of sending, by the originating soft switch, the call connection request message to the incoming soft switch according to the notified routing information.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a configuration diagram briefly showing the configuration of a routing system according to the present invention.

The routing system of the present invention includes an outgoing soft switch 10, an incoming soft switch 20, and a routing server 30.

The originating softswitch 10 has its own domain (e.g., ssw # 1.lge.com) used within the next generation network (hereinafter referred to as NGN network), and from the subscriber stations accommodated to it to the particular called subscriber terminal. When the call connection request message is received, the routing server 30 transmits a routing query for the location of the called subscriber station to receive routing information and performs call control using the provided routing information. At this time, the outgoing soft switch 10 sends the routing information to the routing server 30 when the address of the called subscriber station included in the call connection request message is a phone number according to the existing public network telephone number system (E.164). Before requesting, first check whether the local code is processed through number translation of the corresponding phone number, and then transmit a routing query to the routing server 30. If the address of the called subscriber station included in the call connection request message is an e-mail address according to the Internet address system, the outgoing soft switch 10 immediately transmits a routing query to the routing server 30.

The soft switch 10 requests a number translation upon receiving a call connection request message, and requests a call connection according to the number translation request from the SIP unit 12 and the SIP unit 12 performing call control according to the number translation result. And a number translation unit (14, 24) for performing number translation on the address of the called subscriber terminal included in the message. Here, the number translation unit 14, 16 performs a direct number translation when the address of the called subscriber terminal is a telephone number according to the existing telephone number system (E.164), and then the telephone number is not a national code. Only send a routing query to the routing server (30). The number translation unit 14 or 16 transmits a routing query directly to the routing server 30 when the address of the called subscriber station is an e-mail address based on the Internet address system.

The incoming soft switch 20 has a unique domain (eg, ssw # 2.lge.com) used in the NGN network, and when a call connection request message is received from the originating soft switch 10, it is transmitted to itself through number translation. The subscriber station corresponding to the telephone number included in the received message among the accepted subscriber stations is found and the call is connected.

In the above description, the outgoing soft switch 10 and the incoming soft switch 20 are distinguished from each other, but only according to their roles, and both functions are performed in one soft switch. That is, the soft switch 20 also performs the same function as the outgoing soft switch 10 described above when receiving a call connection request message from the subscriber station accommodated therein.

The routing server 30 manages routing information (telephone number (E.164) and e-mail address and corresponding softswitch domain) for subscriber stations accommodated in the NGN network. When the routing server 30 receives the routing query from the originating soft switch 10, the routing server 30 retrieves the stored routing information and notifies the originating soft switch 10 of the location information of the called subscriber terminal in response to the query. The location information notified by the routing server 30 to the originating softswitch 10 is in the form of user @ host, where user is the telephone number (E.164 DN) of the called subscriber station and host is the domain of the called softswitch 20. .

2 is a flowchart illustrating a SIP routing method between soft switches when a called subscriber station has a telephone number (E.164) in the routing method according to the first embodiment of the present invention.

When the calling subscriber terminal dials a specific telephone number (E.164 DN) to request a call connection, the SIP unit 12 transmits a number translation for the received telephone number (E.164 DN) to the number translation unit 14. (①)

According to the number translation request, the number translation unit 14 performs number translation on the telephone number (2).

The number translation unit 14 determines whether the called subscriber terminal having the corresponding telephone number is a terminal managed by the user 10 or a terminal housed in another soft switch using the number translated telephone number (③).

As a result of the determination, the number translation unit 14 notifies the SIP unit 12 of the translation result when the called subscriber terminal is a terminal accommodated in the ten. Then, the SIP unit 12 performs a call connection by finding a subscriber terminal corresponding to the corresponding phone number among subscriber terminals accommodated therein (④).

However, the number translation unit 14 transmits a routing query for requesting location information on the called subscriber terminal to the routing server 30 when the called subscriber terminal is not a terminal accommodated in the user 10 (⑤).

The routing server 30 retrieves the routing information of the stored subscriber stations and notifies the number translation unit 14 of the location information (E.164 DN@ssw#2.lge.com) of the called subscriber terminal (⑥). ).

The number translation unit 14, which has been informed of the location information from the routing server 30, informs the SIP unit 12 of the location information as a result of number translation (⑦).

The SIP unit 12 configures the Request-Line in the INVITE message using the received location information of the incoming soft switch 20, and sends the SIP INVITE message to the domain (ssw # 2.lge.com) of the incoming soft switch 20. (sip: E.164 DN@ssw#2.lge.com) is transmitted (⑧).

The SIP unit 22 of the incoming soft switch 20 that receives the SIP INVITE message requests the number translation unit 22 to translate the telephone number (E.164 DN) included in the message (⑨).

After the number translation unit 24 performs the number translation on the corresponding phone number and notifies the SIP unit 22 of the result again, the SIP unit 22 performs a call connection by searching for the called terminal using the number translation result. (⑩)

3 is a flowchart illustrating a SIP routing method between soft switches when a called subscriber station has an e-mail address as a routing method according to a second embodiment of the present invention.

When the calling subscriber terminal dials the SIP-URL (aaa@lge.com) in the form of an e-mail address to call the incoming call, the SIP unit 12 requests the number translation unit 14 to translate the number (①).

However, since the subscriber station does not have information on the corresponding softswitch, the number translation unit 14 immediately sends a routing query requesting the location information of the called subscriber station to the routing server 30. (②).

The routing server 30 retrieves the stored routing information and searches for the phone number (E.164 DN) corresponding to the ID of the e-mail address and the domain (ssw # 2.lge.com) of the incoming soft switch 20 in which the called subscriber terminal is accommodated. In response to the routing query, the location information (E.164 DN @) including the telephone number (E.164 DN) of the called subscriber station and the domain (ssw # 2.lge.com) of the called soft switch 20 are found. ssw # 2.lge.com) is notified to the number translation unit 14 (③).

The number translation unit 14 notifies the SIP unit 12 of the received location information (④).

The SIP unit 12 compares whether the domain of the notified incoming soft switch 20 matches the domain of its own 10 and performs local call processing if it is the same, and if the domain is not the same, the call to the corresponding incoming soft switch 20. Send connection request message SIP INVITE (sip: E.164 DN@ssw#2.lge.com) (⑤).

The SIP unit 22 of the incoming soft switch 20 that has received the call connection request message SIP INVITE requests the number translation unit 22 to translate the telephone number (E.164 DN) included in the message (⑥). ).

After the number translation unit 24 performs the number translation on the corresponding phone number and notifies the SIP unit 22 of the result again, the SIP unit 22 performs a call connection by searching for the called terminal using the number translation result. (⑦).

As described above, the SIP routing method of the present invention is not limited to a specific addressing scheme, and performs call connection by integrating different addressing schemes, thereby ensuring the number portability of subscriber stations in the NGN network and providing a telephone number (E. By first performing the number translation on the soft switch, the subscriber can be prevented from unnecessary interworking with the routing server for the subscriber housed in the soft switch, thereby improving network performance.

1 is a configuration diagram briefly showing the configuration of a routing system according to the present invention.

2 is a flowchart showing a routing method according to the first embodiment of the present invention.

3 is a flowchart illustrating a routing method according to a second embodiment of the present invention.

Claims (8)

A routing server managing routing information for subscriber stations accommodated in a next-generation network, and informing routing information about a corresponding subscriber station upon receiving a routing query requesting a location for specific destination subscriber stations; An outgoing soft switch having a unique domain and transmitting the routing query to the routing server when receiving a call connection request message for the specific called subscriber terminal and receiving the routing information and performing call control according to the provided routing information; And SIP routing system having a unique domain, and the incoming soft switch to perform the call connection by searching for the specific subscriber station accommodated by the number translation when receiving a call connection request message from the originating soft switch. The method of claim 1, wherein the routing server Stores and manages telephone numbers and e-mail addresses assigned to the subscriber terminals and domains of the corresponding soft switches, and notifies the telephone number of the specific called subscriber terminal and the domain of the called soft switches in response to the routing query. SIP routing system characterized in that. The method of claim 2, wherein the outgoing soft switch Upon reception of the call connection request message, if the specific called party has a phone number, it is first checked whether local call processing is possible, and if the local call cannot be processed, the routing query is transmitted, and the specific called party receives an email address. If it has a SIP routing system, characterized in that for transmitting the routing query immediately. The method of claim 3, wherein the routing server When receiving a routing query for an e-mail address, the phone number corresponding to the ID of the e-mail address and the domain of the called soft switch are searched for in the stored routing information to notify the calling soft switch of the retrieved phone number and domain. SIP routing system. A first step of requesting, by an originating softswitch, location information for the called subscriber station to a routing server that manages routing information for subscriber stations accommodated in a next-generation network upon receiving a call connection request message for the called subscriber terminal; A second step of the routing server retrieving routing information for the called subscriber station and notifying the calling soft switch according to the location information request; And And a third step of sending, by the originating softswitch, a call connection request message to the called softswitch according to the notified routing information. The method of claim 5, wherein the routing information is And a phone number and an e-mail address of the subscriber station and a domain of the incoming soft switch corresponding thereto. The method of claim 6, wherein the first step If the address of the called subscriber station is a telephone number according to a general public network telephone number system, SIP routing method between the soft switches, characterized in that requesting the location information to the routing server only when local call processing is impossible. The method of claim 6, wherein the second step If the address of the called subscriber terminal is an e-mail address, the SIP routing method between the soft switches, wherein the telephone number corresponding to the ID of the e-mail address and the domain of the called soft switch are searched and notified to the calling soft switch. .