KR20110120435A - Hlr access server for direct access between internet telephony network and mobile network and method of processing call using thereof - Google Patents

Abstract

PURPOSE: A HLR access server for a direct access between an internet telephony network and a mobile network and method of processing a call using thereof for directly connecting an internet telephone and a mobile communication network are provided to connect the call of a sender with the call processing server of an internet telephone network which is the nearest internet telephone network with a receiver. CONSTITUTION: A number translation processing unit(102) translates TLDN(Temporary Local Directory Number) information received from the home location register of a mobile communication network due to the location information request of a receiver terminal by a receiver number obtained from an SIP/SIP-T(Session Initiation Protocol/SIP for Telephones) processing unit. The number translation processing unit grasps the location information of the receiver terminal. A MAP(Mobile Application Part) message processing unit(105) processes a MAP message for connecting the home location register. An interface unit(106) transceives the MAP message to a signaling gateway. A call control unit(103) controls a call processing logic according to the data transmission protocol.

Description

Subscriber location identification device for direct access between Internet phone network and mobile communication network Access server and call processing method using the access server {HLR ACCESS SERVER FOR DIRECT ACCESS BETWEEN INTERNET TELEPHONY NETWORK AND MOBILE NETWORK AND METHOD OF PROCESSING CALL USING THEREOF}

The present invention relates to a subscriber location identification device access server for a direct connection between an Internet telephone network and a mobile communication network, and to a call processing method using the access server. Subscriber for direct connection between internet phone network and mobile communication network which can reduce settlement cost of internet phone network operator by receiving caller's location inquiry information from Location Register and connecting caller's call to call processing server of internet phone network closest to called party. A location identification apparatus access server and a call processing method using the access server.

Due to the development of communication technology, a call service, which was only available through a conventional telephone network (eg, a public switched telephone network (PSTN)), can be provided through an internet network.

Voice Over Internet Protocol (VoIP) service system is a system that provides subscribers with two-way voice service through a public Internet network, which is a user's personal computer (PC) or personal digital assistant (PDA). Various user terminals are connected to an IP network such as the Internet network, and can talk to each other.

Protocols currently used in VoIP service systems include Session Initiation Protocol (SIP) announced by the Internet Engineering Task Force (IETF) and H.323 established by the International Telecommunication Union-Telecommunication standardization sector (ITU-T).

SIP is a text-based application layer control protocol that performs session and call setup and termination for video and voice communication, and can be used in various applications such as teleconference, telephone, visit, instant messaging, and the like.

The SIP includes a request message and a response message. The SIP request message includes INVITE, ACK, BYE, REGISTER, CANCEL, and OPTIONS, and the SIP response message includes a 1xx (Status Code) as a status code. Information Response), 2xx (Successful Response), 3xx (Redirection Response), 4xx (Client Error, Request Failure), 5xx (Server Failure), 6xx (Global Failure).

Referring to FIG. 1, a VoIP service system using SIP is described. The communication terminals 13-1 and 13-2 are soft phones or IPs embedded in various terminals such as a personal computer (PC) or a personal digital assistant (PDA). It may be a hard phone such as a phone, the communication terminal (13-1, 13-2) is connected to the Internet network (12). In addition, the communication terminal 13-3 connected to the telephone network 15 may be a mobile phone or a general telephone. In order for each communication terminal 13-1 and 13-2 to set up a call through the SIP server 11, a SIP client function must be installed.

The SIP server 11 performs call setup for various services as well as VoIP service between communication terminals using SIP, and interworks with the gateway 14 through the Internet network 12. At this time, the gateway 14 exchanges signals between the Internet network 12 and the telephone network 15 or performs voice exchange between a Real-time Transport Protocol (RTP) packet and a Time Division Multiplexing (TDM) signal. 12) and the telephone network 15 serves to interlock with each other.

In this case, for direct access to the MSC (Mobile Switching Center) of the mobile telephone network in which the called party's call is handled by the caller through the Internet telephone network, a function for interworking with the MAP of the mobile communication network is established. There is a problem in that the relay call processing server on the Internet telephone network needs to be changed.

The present invention has been made to solve the above problems, the present invention is to receive the recipient's location lookup information from the home location register (Home Location Register) of the mobile communication network when interworking call processing from the Internet phone network to the mobile communication network It is an object of the present invention to provide a subscriber location identification device access server for direct connection between an internet phone network and a mobile communication network that can connect a caller's call to a call processing server of the nearest internet telephone network, and a call processing method using the access server.

In addition, the present invention is interworking with the relay call processing server of the Internet phone network through the Session Initiation Protocol (SIP), and the recipient located in the mobile communication network by interworking with the Home Location Register of the mobile communication network (MAAP) It is an object of the present invention to provide a subscriber location identification device access server for direct connection between an Internet telephone network and a mobile communication network capable of acquiring location information.

Subscriber location identification device access server for direct connection between the Internet phone network and the mobile communication network of the present invention for achieving the above object is a SIP processing SIP or SIP-T message received from the relay call processing server on the Internet phone network / SIP-T processing unit, to determine the location information of the called party terminal by translating the TLDN information received from the home location register of the mobile communication network according to the location information request of the called party terminal by the called party number obtained from the SIP / SIP-T processing unit A number translation processing unit, a MAP message processing unit for processing a MAP message for interworking with the home location register, an interface unit for transmitting and receiving the MAP message to a signaling gateway, and a call control unit for controlling call processing logic in accordance with a data transmission protocol. Characterized in that made.

In addition, the call controller generates and transmits an INVITE (TLDN) message to the relay call processing server on the Internet telephone network located in the region closest to the MSC of the mobile communication network by using the location information of the called terminal.

In addition, the call control unit is set to the 18X message indicating that the call is connected, the 200 (OK) message generated by the relay call processing server receiving the ANM (Answer Message) indicating that the called terminal is connected to the call line via the HAS. The BYE message and the ACK message are characterized by setting the HAS to a stateless proxy server mode so as not to go through the HAS.

In addition, the call controller generates a 302 (TLDN) message to generate an INVITE (TLDN) message in the subscriber call processing server, and sets the HAS to the redirect server mode by transmitting the message to the subscriber call processing server.

In addition, the relay call processing server on the Internet phone network is characterized in that at least one of the SIP proxy server, soft switch, IMS.

A call processing method using a subscriber location identifier access server for direct connection between an Internet telephone network and a mobile communication network of the present invention for achieving another object includes receiving an INVITE (CdPN) message from a subscriber call processing server where a caller terminal is located. Acquiring the location information of the called terminal according to the called party's telephone number on the mobile communication network of the INVITE (CdPN) message and generating the INVITE (TLDN) message according to the obtained location information of the called terminal; And transmitting to a relay call processing server on a geographically adjacent internet phone network.

In addition, acquiring the location information of the called party terminal according to the called party's telephone number on the mobile communication network of the INVITE (CdPN) message, the HAS sends a LOCREQ message to the HLR through the GHLR to request the location information of the called party on the mobile communication network; The HLR sends a ROUTREQ message requesting the TLDN information of the called party to the MSC, the MSC responds to the HLR a routreq (TLDN) message containing the TLDN information, and through the GHLR locreq (TLDN containing the TLDN) ) Delivering the message to the HAS.

In addition, the INVITE (TLDN) message transmits a 302 (TLDN) message, which is a redirection response, from the HAS to the subscriber call processing server, and generates an INVITE (TLDN) message from the subscriber call processing server.

According to the subscriber location identification device access server for the direct connection between the Internet phone network and the mobile communication network of the present invention and the call processing method using the access server, the relay call processing server of the Internet phone network and the home location register on the mobile communication network are interlocked. Therefore, by obtaining the location information of the called party and connecting the caller's call to the relay call processing server of the Internet telephone network closest to the called party, the settlement cost of the Internet telephone network operator can be reduced.

In addition, there is an advantage that the location information of the called party on the mobile communication network can be directly connected to the relay call processing server of the MSC and the Internet telephone network where the called party is located without passing through the gateway switch.

1 is a VoIP service system according to a conventional SIP method,
2 is a block diagram of a subscriber location identification device access server for direct connection between an Internet telephone network and a mobile communication network according to the present invention;
3 is a block diagram showing an embodiment of a call processing method using a subscriber location identification device access server for direct connection between an Internet phone network and a mobile communication network according to the present invention;
4, 5 and 6 is a call processing flowchart illustrating a call processing method using a subscriber location identifier access server for direct connection between an Internet telephone network and a mobile communication network according to the present invention.

The following detailed description is only illustrative, and merely illustrates embodiments of the present invention. In addition, the principles and concepts of the present invention are provided for the purpose of explanation and most useful.

Accordingly, various forms that can be implemented by those of ordinary skill in the art, as well as not intended to provide a detailed structure beyond the basic understanding of the present invention through the drawings.

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

2 is a block diagram of a subscriber location identification apparatus access server for direct connection between an Internet telephone network and a mobile communication network according to the present invention.

As shown in FIG. 2, the subscriber location ID access server 100 (hereinafter referred to as HAS) of the present invention is a SIP / SIP-T processing unit 101, a number translation processing unit 102, and a call control unit 103. ), A number porting DB 104, a MAP message processing unit 105 and an interface unit 106. The functions of each part will be described with reference to the process of performing call processing from the Internet phone network to the mobile communication network.

The SIP / SIP-T processing unit 101 interworks with a SIP Proxy server, a soft switch (SSW, Softswitch), or an IMS (IP Multimedia Subsystem) that is a subscriber call processing server or a relay call processing server on an Internet telephone network. (SIP for Telephones) Performs the function of processing a message. The SIP-T is a protocol used for establishing, modifying and terminating a session for interworking with the soft switch by using SIP for interconnection between a packet network and a general telephone network (PSTN). The SIP or SIP-T (SIP for Telephones) message received from the subscriber call processing server in which the caller terminal is located or through the relay call processing server is interpreted to obtain the called party's mobile communication telephone number and obtained by the number translation processing unit. Send the called party's mobile phone number.

The number translation processing unit 102 transfers the mobile communication subscriber number which is the called party number received from the SIP / SIP-T processing unit 101 to a home location register (hereinafter referred to as HLR) through the MAP message processing unit 105. Transmits TLDN (Temporary Local Directory Number) information received by querying and processes TLDN information according to the location information of the current called party's terminal. Here, the HLR receives the current location information of the called party's terminal from the mobile switching center (hereinafter referred to as MSC) and transmits the received location information to the HAS 100 so that the called party can receive the call at the mobile communication network. Therefore, the HAS 100 can grasp the current location information of the called terminal on the mobile communication network from the TLDN information, and the relay on the Internet telephone network located closest to the MSC location and the geographical location of the mobile communication network according to the current location information of the called terminal. The prefix is inserted into the TLDN information received so that the caller's call is connected to the call processing server. For example, as a result of translating the TLDN information obtained through the MAP message processing unit 105 from the HLR of the mobile communication network, the receiver terminal is processed to 051 + TLDN in Busan.

The call controller 103 controls a series of call processing logics of the HAS 100. The call control unit 103 uses the TLDN information processed by the number translation processing unit 150 to refer to the IP database of the relay call processing server that is separately managed in the Internet telephone network, and to locate the MSC on the mobile communication network according to the current location information of the called party's terminal. And IP address information of a relay call processing server (hereinafter, referred to as an MSC proximity relay call processing server) of an Internet telephone network located closest to the geographical location. Thereafter, the call controller 103 generates an INVITE (TLDN) message including the processed TLDN information and transmits the message to the MSC proximity relay call processing server.

In addition, the call controller 103 transmits the IP address information and the processed TLDN information of the MSC proximity relay call processing server to the subscriber call processing server where the caller terminal is located. The subscriber call processing server connected to the caller terminal receiving the IP address information of the MSC proximity relay call processing server generates an INVITE (TLDN) message including the processed TLDN information and transmits the message to the MSC proximity relay call processing server.

The number porting DB 104 stores, updates, and manages the number porting subscriber information in order to retrieve the mobile communication provider information of the called number.

The MAP message processing unit 105 performs a function of processing a MAP (Mobile Application Part) message, which is an intelligent network protocol on a mobile communication network for interworking with an HLR. That is, the HAS can grasp the location information of the called party's terminal by processing the packet type SIP message on the Internet telephone network and processing the line type MAP message on the mobile communication network.

Here, the MAP message processing unit 105 is interlocked with the Diameter in the interworking of the MAP when the HLR is a Home Subscriber Sever (HSS). HSS is a database system that manages location information, authentication information, service information, etc. of subscribers in a telecommunication network, and basically includes AuC (Authentication Center) function along with HLR function.

The interface unit 106 transmits the MAP message generated by the MAP message processing unit 105 to the signaling gateway 300 according to the SIGTRAN protocol, thereby performing data communication with the HLR on the mobile communication network.

3 is a block diagram showing an embodiment of a call processing method using a subscriber location identification device access server for direct connection between an Internet telephone network and a mobile communication network according to the present invention.

An embodiment of the present invention describes a process in which a caller in Seoul on an Internet telephone network uses a called party in Busan on a mobile communication network and a direct connection between the Internet telephone network and a mobile communication network using the HAS 100.

As shown in Figure 3, when the caller first picks up the receiver 110 of the Internet phone and enters the recipient's telephone number, the IP telephone adapter (not shown) is the INVITE message including the IP address of the calling party and the recipient's telephone number information. Generate and transmit to the subscriber call processing server 120 where the caller terminal is located (S1). The relay call processing server 130 connected to the subscriber call processing server 120 receives an INVITE message (S2) and inquires the location information of the called party's terminal to the HLR for direct connection with the mobile communication network. In step 100, an INVITE message is transmitted (S3).

The HAS 100 transmits a location request (LOCREQ) to request the location information of the called party's terminal to the GHLR 200 (Gateway HLR) (S4). The HLR 210 receives the LOCREQ (Location Request) from the GHLR 200 (S5) and transmits a Route Request (ROUTREQ) for requesting a TLDN to the MSC 220 (S6). The MSC 220 responds to the HLR 210 with the ROUTREQ Return Result including the TLDN (S7). The HLR 210 delivers the LOCREQ Return Result including the TLDN to the GHLR 200 (S8), and the GHLR 200 delivers the LOCREQ Return Result to the HAS 100 (S9).

The HAS 100 interprets the received TLDN information and transmits an INVITE (TLDN) message to the relay call processing server 140 of Busan, which is located closest to the position of the MSC where the called terminal is located (S10). The relay call processing server 140 and the MSC 220 relay the call processing server 140 through a gateway (not shown) that performs a protocol conversion function of the relay call processing server by interworking with a common line signaling message (ISDN User Part). Requests a call to the MSC 220 where the called party is located in an Initial Address Message (IAM) message (S11). The MSC 220 requests the call to the base station 230 (S12), and the base station 230 transmits the call to the called party's mobile terminal 240 through paging (S13).

According to the present invention, a subscriber location identification device (home location register, HLR) access server (HAS) interworks with a SIP on an Internet telephone network and a MAP on a mobile communication network, and according to a query request for the location information of the called party's terminal through the GHLR. The MSC of the mobile communication network is connected to the MSC where the called terminal is located on the Internet telephone network and the relay call processing server (MSC proximity relay call processing server) on the Internet telephone network closest to the geographic location by using the obtained receiver terminal location information. You can request a call connection.

Therefore, the Internet phone provider can reduce the communication settlement cost with the mobile carrier by using his network more efficiently. According to the related art, an Internet telephone service provider uses a mobile communication network to make a call request from a relay call processing server in Seoul to a mobile communication network and connects from Seoul to Busan. Referring to FIG. 3, when using the HAS of the present invention. Since their Internet phone network is available from Seoul to Busan, the settlement costs are reduced.

4, 5 and 6 is a call processing flowchart illustrating a call processing method using a subscriber location identifier access server for direct connection between an Internet telephone network and a mobile communication network according to the present invention.

A stateful proxy server is a server that continuously tracks and manages communication state information with a client and has a function of a server that provides a service according to the communication state. Here, the communication state information refers to past communication processing results such as connection establishment, data transmission and reception, and error occurrence. A stateless proxy server, on the other hand, refers to a server that always provides a service by an independent request to a client without continuously tracking and managing communication state information.

4 is a call processing flowchart illustrating a call processing method using a subscriber location identifier access server for direct connection between an Internet telephone network and a mobile communication network by operating the HAS as a stateful proxy server.

As shown in FIG. 4, the HAS operates in stateful proxy server mode or B2BUA (Back to Back User Agent) to route all call processing related messages from the start to the end of the call. That is, the HAS receives the caller's INVITE (CdPN) message (2), generates a LOCREQ (3) for identifying the location information of the called party on the mobile communication network, and receives the locreq (TLDN) message (8) received from the GHLR. Create a new INVITE (TLDN) message containing the location information of the called party's terminal. The HAS then transmits an INVITE (TLDN) message 9 to a relay call processing server (MSC proximity relay call processing server) of an Internet telephone network located closest to the location of the MSC where the called terminal is located.

Thereafter, the MSC proximity relay call processing server receiving the INVITE (TLDN) message transmits an IAM (Initial Address Message, 10) requesting a line connection to the called party's terminal to the MSC, and the MSC receives the IAM 10. An ACM (Address Complete Message) 12 is transmitted to the MSC proximity relay call processing server. The MSC proximity relay call processing server receiving the ACM 12 transmits an 18X message 13 to the HAS 100 informing the HAS of a ringing, and the 18X message 13 is a subscriber call processing server. Via and to the caller's IP telephony adapter (not shown) to ring the caller's Internet telephone.

Then, when the called terminal presses the call button, the MSC transmits an ANM (Answer Message, 17) indicating that the called terminal is connected on the call line to the relay call processing server on the Internet telephone network, and receives the ANM 17 from the Internet. The relay call processing server on the telephone network transmits a 200 (OK, 19) message to the HAS 100 that the call with the called terminal is successful.

Thereafter, an ACK 22 message indicating that the ANM has been received from the caller's IP telephony adapter (not shown) is received by the MSC proximity relay call processing server via the HAS. The called party terminal is connected to the voice call line so that the other party can make a voice call.

After the end of the voice call between the other party and the caller puts down the handset of the Internet phone, the BYE message 26, which is the session termination notification request, is transmitted to the MSC proximity relay call processing server via the HAS, and the message 200 is a response to the BYE. (31) is also received by the HAS HAS can know that the telephone call is over.

Here, since the above-mentioned call processing related SIP messages, 18X (13), 200 (18), ACK (22) and BYE (26) messages via the HAS, the HAS can manage the entire call history for the call processing. In this case, the HAS must manage the call state information until the call is terminated, which may cause a limitation in call processing capacity.

5 is a call processing flowchart illustrating a call processing method using a subscriber location identifier access server for direct connection between an Internet telephone network and a mobile communication network by operating the HAS as a stateless proxy server.

As shown in FIG. 5, the HAS is set to the stateless proxy server mode so that the ACK 22, BYE 25 and 200 29 messages of call processing related SIP messages do not pass through the HAS. It can be set by not entering the HAS IP address in the Route item. In other words, the ACK 22 message indicating that the ANM is well received by the relay call processing server, the BYE message 25 which is a session end notification request and the response to the BYE when the caller puts down the handset of the Internet phone after the voice call between the other parties is terminated. By not writing the address of the HAS in the SIP message so that the 200 message 29 does not go through the HAS, the SIP message can be directly exchanged between the subscriber call processing server and the relay call processing server.

Therefore, when HAS is set to stateless server mode, call processing capacity is relatively reduced compared to stateful proxy server mode or B2BUA (Back to Back User Agent), which is efficient in data processing.

6 is a call processing flowchart illustrating a call processing method using a subscriber location identifier access server for direct connection between an Internet telephone network and a mobile communication network by operating a HAS as a redirect server.

Next, as shown in FIG. 6, the HAS 100 operates in the redirect server mode and receives the INVITE (CdPN) message 2 from the subscriber call processing server, and then the location information request LOCREQ message of the called terminal. 3) to the GHLR, and interprets the locreq (TLDN) message (8) received from the GHLR according to the location information request of the called terminal to process the TLDN information to be connected to the MSC proximity relay call processing server. Thereafter, a 302 (TLDN) message 9 including the processed TLDN information is transmitted to a subscriber call processing server where a caller's terminal is located, and an ACK message 10 is received.

That is, HAS does not generate the INVITE (TLDN) message 9, and call processing related SIP messages 18X (15), 200 (19), ACK (22), and BYE (25) message do not go through HAS. Compared to the stateless proxy server mode of FIG. 5, the throughput of messages is reduced, so that the call processing capacity can be relatively improved.

The present invention has been described in detail with reference to exemplary embodiments, but those skilled in the art to which the present invention pertains can make various modifications without departing from the scope of the present invention. I will understand.

Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by equivalents to the appended claims, as well as the appended claims.

100: HAS 101: SIP / SIP-T processing unit
102: number translation processing unit 103: call control unit
104: number transfer DB 105: MAP message processing unit
106: interface unit 140: relay call processing server
210: HLR 220: MSC

Claims (8)

A SIP / SIP-T processing unit for processing SIP or SIP-T messages received from a relay call processing server on an Internet telephone network;
A number translation processing unit for determining the location information of the called party terminal by translating the TLDN information received from the home location register of the mobile communication network according to the request of the location information of the called party terminal by the called party number obtained from the SIP / SIP-T processing unit;
MAP message processing unit for processing a MAP message for interworking with the home location register,
An interface unit for transmitting and receiving the MAP message to a signaling gateway;
And a call control unit for controlling call processing logic according to a data transmission protocol. 20. A subscriber location identification apparatus access server for direct connection between an internet telephone network and a mobile communication network.
The method of claim 1,
The call control unit
Directly between the Internet phone network and the mobile communication network by generating and transmitting an INVITE (TLDN) message to the relay call processing server on the Internet phone network located closest to the MSC of the mobile communication network by using the location information of the called party's terminal. Subscriber location identifier access server for access.
The method of claim 1,
The call controller
An 18X message indicating that the call is being connected, and a 200 (OK) message generated by the relay call processing server receiving ANM (Answer Message) indicating that the called party terminal is connected to the call line are set to pass through the HAS, and the BYE message and the ACK. And the message is configured to set the HAS in a stateless proxy server mode so as not to go through the HAS.
The method of claim 1,
The call control unit
Direct connection between the Internet telephone network and the mobile communication network is generated by generating a 302 (TLDN) message and generating the 302 (TLDN) message from the subscriber call processing server to the subscriber call processing server. Subscriber location identification device access server for.
The method of claim 1,
The relay call processing server on the Internet telephone network is at least one of a SIP proxy server, a soft switch, and an IMS.
Receiving an INVITE (CdPN) message from a subscriber call processing server where a calling party terminal is located;
Acquiring the location information of the called terminal according to the called party's telephone number on the mobile communication network of the INVITE (CdPN) message; And
Generating an INVITE (TLDN) message according to the acquired location information of the called party terminal and transmitting the message to a relay call processing server on an internet telephone network geographically adjacent to the MSC where the called party terminal is located; Call processing method using a subscriber location identifier access server for direct connection between a mobile communication network and a mobile communication network.
The method of claim 6,
Acquiring the location information of the called party terminal according to the called party number on the mobile communication network of the INVITE (CdPN) message
HAS sends a LOCREQ message to the HLR via the GHLR to request the location information of the called party on the mobile communication network;
Sending, by the HLR, an ROUTREQ message requesting the called party's TLDN information to the MSC;
The MSC responding to the HLR with a routreq (TLDN) message containing TLDN information; And transmitting a locreq (TLDN) message including a TLDN to the HAS through the GHLR to the HAS. .
The method of claim 6,
The INVITE (TLDN) message transmits a 302 (TLDN) message, which is a redirect response, from the HAS to the subscriber call processing server, and generates an INVITE (TLDN) message from the subscriber call processing server. Call processing method using subscriber location access device access server for direct access.

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