KR20120041454A - Legacy service system based on ims and method of controlling the same - Google Patents

Abstract

PURPOSE: An IMS(IP Multimedia System) based legacy service system and a service method thereof are provided to minimize network configuration elements in a protocol type of a PSTN legacy subscriber and to accept a PSTN(Public Switched Telephone Network). CONSTITUTION: An IMS interworking media gateway(100) requests a session setup to a call session control function. The IMS interworking media gateway generates a call control signal according to receiving/transmitting information of an SIP message. The IMS interworking media gateway transmits the generated call control signal to the relay. The IMS interworking media gateway converts PSTN service data into IMS service data.

Description

IMS-based legacy service system and service method {LEGACY SERVICE SYSTEM BASED ON IMS AND METHOD OF CONTROLLING THE SAME}

The present invention relates to an IMS-based legacy service system and a service method, by minimizing additional network components while maintaining a protocol scheme and a subscriber network environment of a PSTN legacy subscriber, thereby allowing a PSTN to be accommodated in an IMS network. The present invention relates to an IMS-based legacy service system and service method that can easily integrate and manage a subscriber to be provided with a new communication environment and to reduce costs and time for network design and management.

IMS (IP Multimedia Subsystem) is a technology that provides a multimedia service based on the Internet Protocol (IP). In the IMS environment, voice signals are transmitted using IP or Voice over Internet Protocol (VoIP), and can provide various additional service functions in addition to simply transmitting voice calls. As IMS emerges as a next-generation core information and communication technology, there is a need for providing a service by integrating subscribers accommodated in existing Public Switched Telephone Network (PSTN) services into an IMS network.

In case of providing call function to subscriber through IMS network, it has a structure of providing media data using SIP (Session Initiation Protocol) to a terminal supporting IP data processing function.

On the other hand, when providing PSTN service, a subscriber terminal (RT) is established in a large apartment complex, and the PSTN exchange provides a call service to legacy terminals of individual customers connected to the transmission equipment using the V5.2 protocol. have. In the case of enterprise customers, the PSTN exchange provides services to the subscriber's Private Branch eXchange (PBX) using ISDN PRI, R2, and No.7 signaling protocols, thereby connecting to the E1 TDM transmission line of the PBX. Legacy terminals are housed in the PSTN exchange. In this way, the IMS network and the PSTN are separated from each other, and the terminals and the protocols used are different.

Accordingly, according to the ESTI TISPAN NGN IMS-based PES (PSTN / ISDN Emulation Subsystem) standard structure, which is a conventional IMS-based PSTN accommodation technology, a media gateway (MG) for data conversion between PSTN and IMS and AGCF for SIP processing Access Gateway Control Function) is added to accommodate PSTN legacy terminals in IMS.

However, when interworking IMS and PSTN by separately building a media gateway (MG) device and an AGCF device, there is a problem in that the cost and time for building a network increase because the number of devices for network configuration increases.

The present invention has been made to solve the above-described problems, by minimizing additional network components while maintaining the PSTN legacy subscriber's protocol scheme and subscriber network environment intact, thereby allowing the PSTN to be accommodated in the IMS network. The technical challenge is to provide an IMS-based legacy service system and service method that can easily integrate and manage the accepted subscribers into a new communication environment and save time and costs for network design and deployment.

In order to solve the above problems, the IMS-based legacy service system according to the present invention, the legacy terminal receiving a Public Switched Telephone Network (PSTN) service; A relay device connecting the call line of the legacy terminal according to a call control signal to relay transmission and reception of voice data and PSTN service data including the call control signal; Generates a SIP message according to incoming and outgoing information of the call control signal received from the relay device, requests a session setup to a Call Session Control Function (IPMS) network of the IMS (IP Multimedia System) network, and processes the call. An IMS interworking media gateway which generates the call control signal according to the incoming and outgoing information of the SIP message received from the control unit and transmits the call control signal to the relay device, and converts the data format of the PSTN service data and the IMS service data. It includes.

Here, the relay device may include at least one of a remote terminal (RT) and a private branch eXchange (PBX).

In order to solve the above problems, IMS interworking media gateway according to the present invention, the network interface for transmitting and receiving data to the relay device and the IMS (IP Multimedia Subsystem) network; A media processing unit which converts data types of the PSTN service data and the IMS service data; An IMS processing unit generating a SIP message according to the originating and terminating information included in the call control signal, transmitting the SIP message to the call processing control unit of the IMS, and controlling session establishment according to the response of the call processing control unit; And a media gateway controller for generating and transmitting a call control signal to the relay device according to the originating and terminating information included in the SIP message.

Here, the media processing unit may include a TDM / IP media conversion unit for converting data types of time division multiplexer (TDM) data transmitted to and received from the relay device and packet data transmitted and received to the IMS network.

The IMS processing unit may include: a SIP processing unit which generates the SIP message to be transmitted and extracts call related data from the received SIP message; A SIP UAC / UAS processing unit performing a user agent client (UAC) function for requesting session establishment and a user agent server (UAS) function in response to the session establishment request; A subscriber registration processing unit for requesting service authentication to the IMS network for the outgoing and incoming information; And an IMS Call Session Control Function (CSCF) interworking unit controlling session establishment under the control of the call processing control unit of the IMS.

The media gateway controller may include a PSTN protocol processor configured to generate a call control signal for controlling the line connection of the legacy terminal according to the origination and destination information included in the SIP message.

The media gateway controller may include a line management unit that manages at least one line usage state of a remote terminal (RT) and a private branch eXchange (PBX) for controlling the line connection.

The call control signal generated by the media gateway controller may include at least one of a V5.2 protocol, an ISDN PRI protocol, an R2 protocol, and a No 7 signaling protocol.

In order to solve the above problems, IMS-based legacy service method according to the present invention, the step of transmitting a call setup request signal from the legacy terminal of the Public Switched Telephone Network (PSTN) to the relay device; Transmitting, by the relay device, a call setup request signal of the legacy terminal to an IP Multimedia Subsystem (IMS) interworking media gateway; Generating, by the IMS interworking media gateway, a SIP message according to incoming and outgoing information included in the call setup request signal and transmitting the SIP message to a call session control function of an IMS network; Establishing, by the call processing controller, a session with the IMS-linked media gateway according to the SIP message; Receiving, by the IMS interworking media gateway, IMS service data through the session and converting the IMS service data into PSTN service data; Transmitting, by the IMS interworking media gateway, the PSTN service data to the relay device; And transmitting, by the relay device, the PSTN service data to the legacy terminal.

Here, the legacy terminal transmits the PSTN service data to the relay device; Transmitting, by the relay device, the PSTN service data to the IMS interworking media gateway; The IMS interworking media gateway converting the PSTN service data into the packet data; And transmitting, by the IMS interworking media gateway, the IMS service data through the session.

In order to solve the above problems, IMS interworking media gateway control method according to the present invention comprises the steps of: receiving a call setup request signal of the legacy terminal from a public switched telephone network (PSTN) relay; Generating a SIP message according to incoming and outgoing information included in the call establishment request signal; Transmitting the SIP message to a Call Session Control Function (CMS) of an IP Multimedia Subsystem (IMS) network; Establishing a session under control of the call processing controller; Receiving IMS service data through the session and converting the IMS service data into PSTN service data; And transmitting PSTN service data to the relay device.

Here, receiving the PSTN service data of the legacy terminal from the relay device; Converting the PSTN service data into IMS service data; And transmitting the IMS service data through the session.

The establishing of the session under the control of the call processing controller may include establishing the session in association with a Call Session Control Function (CSCF) of the IMS.

The transmitting of the PSTN service data to the relay device may include transmitting the PSTN service data using at least one of a V5.2 protocol, an ISDN PRI protocol, an R2 protocol, and a No 7 signaling protocol. can do.

In order to solve the above problems, IMS interworking media gateway control method according to the present invention, receiving a SIP message; Establishing a session according to incoming and outgoing information included in the SIP message; Receiving IMS service data through the session and converting the IMS service data into PSTN service data; And transmitting the PSTN service data to the called party legacy terminal according to the incoming and outgoing information included in the SIP message.

The transmitting of the PSTN service data to the legacy terminal of the PSTN according to the incoming and outgoing information included in the IMS service data may include at least one of a V5.2 protocol, an ISDN PRI protocol, an R2 protocol, and a No 7 signaling protocol. The method may include transmitting the voice signal data in a protocol manner.

The transmitting of the PSTN service data to the called party legacy terminal according to the incoming and outgoing information included in the SIP message includes: a remote terminal (RT) and a private branch eXchange (PBX) for controlling a line connection of the legacy terminal; Checking a line usage state of at least one of the following; And selecting an idle line among the lines to transmit the PSTN service data.

As described above, the IMS-based legacy service system and service method of the present invention can provide a PSTN service through an IMS network by minimizing additional network components while maintaining a protocol scheme and a subscriber network environment of a PSTN service subscriber. By doing so, subscribers subscribed to the PSTN service can be easily integrated and managed in a new communication environment, saving time and money for network design and construction.

1 is a block diagram of an IMS-based legacy service system according to an embodiment of the present invention;
2 is a control block diagram of an IMS interworking media gateway according to an embodiment of the present invention;
3 is a control block diagram of a media processing unit of FIG. 2;
4 is a control block diagram of the IMS processor of FIG. 2;
5 is a control block diagram of a media gateway controller of FIG. 2;
6 is a service table of an IMS-based legacy service system according to an embodiment of the present invention;
7 is a signal flow diagram of an IMS-based legacy service method according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of an IMS (IP Multimedia Subsystem) based legacy service system according to an embodiment of the present invention.

As shown in FIG. 1, the IMS-based legacy service system connects a call terminal of the legacy terminal 7 according to a call control signal with a legacy terminal 7 provided with a public switched telephone network (PSTN) service and a PSTN. Relay device for transmitting / receiving service data, IMS 5 for providing IP-based communication service, application providing unit 1 and authentication server 3, data transmission and reception between PSTN 10 and IMS network It includes the IMS interworking media gateway 100 to relay the.

The IMS 5 is a communication network based on a communication network standard proposed by the 3rd Generation Partnership Project (3GPP). The IMS 5 provides an IP-based communication service and mainly uses a signaling protocol such as a Session Initiation Protocol (SIP).

The application providing unit 1 includes a conference call function, a video conference call function, a media control function, an intelligent network prepaid billing function, a billing information transmission function, a push-to-talk control function, an announcement broadcast function, and a ringback tone ring. Provides an application that provides services such as back-tone functionality. The application providing unit 1 may be implemented in the form of a server to provide various application functions in one application providing server, or a plurality of application servers may provide application functions according to respective functions.

The authentication server 3 may provide functions such as subscriber authentication, authorization, and accounting. Representative protocols for authentication, verification, and charging (AAA) were used, such as RADIUS and TACACS +, and the protocol currently standardized by the AAA WG is a diameter protocol. Thus, the authentication server 3 can be a diameter protocol processing server.

The legacy terminal 7 is a subscriber terminal subscribed to the PSTN 10 service, and may include an analog telephone, a digital telephone, a modem, and the like. The legacy terminal 7 is connected to an E1 TDM transmission line through a relay device and transmits and receives PSTN service data including voice data and call control signals using the PSTN protocol. As a relay device for switching the transmission line of the legacy terminal 7, RT (Remote Terminal) 12, PBX (Private Branch eXchange) 22, etc. may be used.

The RT 12 is a subscriber station for switching the call path of the legacy terminal 7 included in the PSTN 10. The RT 12 receives the PSTN service data through the V5.2 protocol and delivers the data to the legacy terminal 7. The RT 12 is located in a subscriber dense area requiring a large number of lines, for example, a large apartment complex, etc. to provide a call service to the legacy terminal 7 of the subscriber.

The PBX 22 also switches the call paths of the legacy terminals 7 included in the PSTN 10, and mainly switches the call paths of terminals included in an extension network such as an enterprise. PBX 22 is an ISDN primary rate interface (PR), R2, No. It receives the PSTN service data according to the PSTN protocol such as 7 signaling and delivers the PSTN service data to the legacy terminal 7 connected to the E1 TDM transmission line.

The IMS-linked media gateway 100 converts the protocol of the PSTN and the protocol of the IMS and performs the function of the SIP terminal with respect to the IMS 5, while converting the data types of the PSTN service data and the IMS service data to transmit and receive data. By relaying the data, data transmission and reception between the IMS 5 network and the PSTN 10 network are possible.

2 is a control block diagram of an IMS interworking media gateway 100 according to an embodiment of the present invention.

The IMS interworking media gateway 100 includes a network interface 110 for interworking between the IMS 5 and the PSTN 10, a media processing unit 120, an IMS processing unit 130, and a media gateway controller 140. , OAM (Operation, Administration, Maintenance) processing unit 150 is included.

The network interface 110 may transmit and receive IMS service data through an IP network of the IMS 5 network, and may transmit and receive PSTN service data through the PSTN 10. Here, the IMS service data may include packet data, and the PSTN service data may include a voice signal and a call control signal.

The IMS interworking media gateway 100 communicates with the call processing control unit on the IMS 5 side in a SIP manner, and the PSTN such as V5.2, R2, No7, etc. with the RT 12 and the PBX 22 of the PSTN 10. Communication can be performed in a protocol manner.

The OAM processor 150 performs maintenance, operation, and management functions that monitor failure or performance of network equipment. The OAM processing unit 150 may process an alarm / state processing function, a statistical function, a trace function, a configuration management function, and the like. Alarm / status processing includes the ability to provide an alarm signal to indicate equipment failure or failure. The trace function includes a function of checking whether the path setting is normally performed to the legacy terminal 7, and the configuration management function bypasses a path that has an error to another path, or switches a device that has an error to another device. It may include the function of.

Hereinafter, functions of the media processing unit 120, the IMS processing unit 130, and the media gateway controller 140 of the IMS linked media gateway 100 will be described in detail with reference to FIGS. 3 to 5.

3 is a control block diagram of the media processing unit 120 of the IMS-linked media gateway 100.

The media processor 120 converts data types of IMS service data and PSTN service data transmitted and received through the IMS 5 network. Accordingly, the media processor 120 includes a TDM / IP media converter 122, a voice codec 124, a DTMF processor 126, and a QoS manager 128.

The TDM / IP media converter 122 converts TDM format PSTN service data transmitted by the subscriber of the legacy terminal 7 into IMS service data in the IP packet format, or converts the IMS service data received from the IMS 5 side. Convert to PSTN service data.

The voice codec 124 encodes or decodes voice data included in the PSTN service data. The most common method of encoding the voice is PCM (Pulse Coded Modulation). In addition, various encoding methods such as ADPCM and CS-ACELP may be applied. There are various voice codecs 124 such as the G.711 codec, the G.729 codec, etc. according to the encoding scheme, the encoding time, the bit rate, and the like. Accordingly, the codec to be applied to the voice codec 124 may be selected in consideration of the voice quality and the amount of encoding data when the voice is compressed through the codec.

The dual tone multi frequency (DTMF) processing unit 126 receives and manages DTMF events input through the legacy terminal 7. The DTMF signal is a combination signal of two frequencies generated when the legacy terminal 7 selects a key, and a unique DTMF signal is provided to each key to identify the key selected by the legacy terminal 7. Accordingly, the DTMF processing unit 126 receives and manages a DTMF signal generated by the legacy terminal 7.

The QoS manager 128 manages a quality of service (QoS) of IMS service data transmitted and received through the IMS 5 network. The QoS manager 128 may manage the quality of IMS service data transmitted to the IMS 5 network by measuring bandwidth, transmission delay, and transmission speed of the IMS 5 network. Accordingly, the QoS manager 128 may include a jitter buffer, an echo canceller, and the like to compensate for jitter due to transmission delay. In addition, a function of marking may be performed by differentially setting each packet processing criterion.

According to this configuration, the media processing unit 120 collects and manages DTMF events received from the PSTN 10 through the DTMF processing unit 126. In addition, the TDM data received from the PSTN 10 is converted into IMS service data through the TDM / IP media converter 122, and the IMS service data received from the IMS 5 is converted into the TDM / IP media converter 122. Can be converted to TDM data. In addition, the QoS management unit 128 may control the transmission quality of the IMS service data.

4 is a control block diagram of the IMS processing unit 130 of the IMS interworking media gateway 100.

The IMS processor 130 performs a function of an IMS agent that processes SIP, and controls the IMS interworking media gateway 100 to interwork with a Call Session Control Function (CSCF) of the IMS 5 network. Accordingly, the IMS processing unit 130 may include a SIP processing unit 132, a SIP UAC / UAS processing unit 134, an IMS CSCF interworking unit 136, and a subscriber registration processing unit 138.

The SIP processing unit 132 generates a SIP message for service control and extracts call related data from the received SIP message. For example, the SIP processing unit 132 may generate a packet header (To, From, Call-ID) including the SIP Tel URI of the calling terminal and the called terminal, and may extract the call-related data from the SIP message.

The SIP UAC / UAS processing unit 134 performs a UAC (User Agent Client) function for requesting session establishment and a UAS (User Agent Server) function for responding to the session establishment request.

The IMS CSCF interworking unit 136 may request a session establishment by sending a SIP message to the CSCF side of the IMS 5, and control the session establishment according to a reply from the CSCF of the IMS 5. That is, under the control of the IMS CSCF interworking unit 136, a session may be established in the IMS interworking media gateway 100 so that subscriber IMS service data may be transmitted and received.

The subscriber registration processing unit 138 performs a service registration / de-regegistration management function of the legacy terminal 7 and the legacy terminal 7 on the subscriber information management server (HSS) side of the IMS 5. Request service authentication. When the legacy terminal 7 is a PBX 22 subscriber, the subscriber registration processing unit 138 may request an authentication from the IMS 5 side by assigning a representative number of a root unit. In addition, in the case of the RT 12 subscriber, the subscriber registration processor 138 may request authentication from the IMS 5 side for the individual number assigned to each subscriber. According to this configuration, the IMS processing unit 130 generates a SIP message according to a request of the originating legacy terminal 7 received through the RT 12 or the PBX 22 and transmits it to the CSCF of the IMS 5 to establish a session. You can request In addition, data of the incoming legacy terminal 7 may be extracted from the SIP message received from the IMS 5 and transmitted to the RT 12 or the PBX 22.

5 is a control block diagram of the media gateway controller 140 of the IMS interworking media gateway 100. The media gateway controller 140 converts the call control signal between the IMS 5 network and the PSTN 10 to each other, and the PSTN is connected to the legacy terminal 7 connected to the RT 12 or the PBX 22 of the PSTN 10. The control signal for delivering the service data may be provided. Accordingly, the media gateway controller 140 includes a PSTN protocol processor 141, an E1 line manager 142, a PBX line processor 143, a digit map manager 144, a tone generator 145, and a V5.2 port manager. 146.

The PSTN protocol processing unit 141 delivers a V5.2 protocol signal for delivering PSTN service data to the legacy terminal 7 connected to the RT 12 and the PSTN service data to the legacy terminal 7 connected to the PBX 22. Processes PRI, R2, and No7 signaling protocol signals.

The E1 line manager 142 manages the channel state of the E1 line connecting the legacy terminal 7 and the PBX 22.

The PBX line processing unit 143 allocates a route number for each NⅹE1 of the PBX 22 and manages a connection route when establishing a call using ISDN PRI, R2, and No 7 signaling.

The digit map manager 144 manages functions provided according to digits. Thus, when a predetermined key is selected in the legacy terminal 7, it is possible to provide a function set in the digit of the selected key.

The tone generator 145 generates a tone signal such as a busy signal, a call waiting signal, or the like according to an operation state of the legacy terminal 7 connected to the line.

The V5.2 port manager 146 allocates and manages a DN (directory number) used as an actual phone number for each port of the V5.2 protocol signal transmitted to the RT 12.

By such a configuration, the media gateway controller 140 may generate and provide a control signal for delivering PSTN service data to the legacy terminal 7 connected to the RT 12 and the PBX 22 of the PSTN 10. .

FIG. 6 illustrates a list of legacy terminal services that can be provided by the application provider 1 as a service table of an IMS based legacy service system according to an exemplary embodiment of the present invention. In order to provide such a call service, it is also possible to build an IMS Telephony Application Server (TAS) that provides only a call function.

As shown in Figure 6, in the legacy terminal service system based on IMS, caller ID display function, anonymous call rejection, caller ID display restriction, unconditional call information display, call forwarding, call forwarding, call waiting, call origination It can provide various call related services such as restriction, automatic call connection and call barring.

In addition, it is possible to provide audio services such as missed announcements, designated time notification, self-number guide, subscriber number change guide, call ring tone, multi-bell.

In addition, it is possible to provide various services such as conference call service, number transfer in the network, representative / individual number transmission, and billing functions performed through a plurality of call access.

That is, the PSTN 10 service subscriber may be accommodated in the IMS 5 network while maintaining the service environment provided by the PSTN 10.

7 is a signal flow diagram of an IMS-based legacy service method according to an embodiment of the present invention, each of which performs a voice call between the first legacy terminal 7 and the second legacy terminal 9 subscribed to the PSTN 10. The protocol or data format of signals transmitted and received between components is illustrated.

Here, the IMS 5 includes a CSCF for controlling a session according to a call or the like. The CSCF registers the subscribed terminal and performs the function of routing SIP signaling to the appropriate server. The CSCF may include a Proxy CSCF (P-CSCF) 50, a Serving CSCF (S-CSCF), and an Interrogating CSCF (I-CSCF). The P-CSCF 50 performs the same function as the SIP proxy server to forward SIP messages to the I-CSCF, and the I-CSCF routes SIP messages received from other networks to the S-CSCF, CSCF controls session establishment and maintains session state to maintain service. Therefore, the SIP message transmitted and received from the IMS interworking media gateway 100 to the IMS 5 is transmitted and received to the P-CSCF 50, after which the function and action of the S-CSCF and I-CSCF is already known technology. Detailed description will be omitted.

When the first legacy terminal 7 accommodated in the PSTN 10 calls the second legacy terminal 9, the preset prefix is dialed according to the position of the second legacy terminal 9 to make a call. Request and transmits a voice signal when the call is connected (S100). The dialing signal transmitted from the first legacy terminal 7 is transmitted to the PBX 22 along the E1 line in the DTMF scheme. In addition, the voice signal transmitted from the first legacy terminal 7 is transmitted to the PBX 22 in the form of TDM data.

The PBX 22 transmits the PSTN service data including the received DTMF format dialing signal and the TDM data format voice data to the IMS interworking media gateway 100 using the PSTN protocol (S110). Here, the PSTN protocol may include an ISDN PRI, R2, No7 signaling protocol, and the like.

The IMS interworking media gateway 100 converts the call control signal of the PSTN protocol received from the PBX 22 into a SIP message. In addition, the PSTN service data in the TDM format is converted into the IMS service data in the IP packet format (S120).

The IMS interworking media gateway 100 transmits IMS service data including the converted call control signal and data to the P-CSCF 50 of the IMS 5 (S130).

The P-CSCF 50 of the IMS 5 processes the SIP message so as to control a session for transmitting / receiving IMS service data to the IMS interworking media gateway 100 (S140).

The IMS Interworking Media Gateway 100 converts the SIP message received from the P-CSCF 50 of the IMS 5 into a PSTN protocol signal (V5.2, ISDN PRI, R2, No7 signaling protocol). In addition, the received IMS service data is converted into PSTN service data (S150).

The IMS interworking media gateway 100 transmits PSTN service data to the PBX 22 of the PSTN (S160).

The PBX 22 establishes a call connection path according to a call control signal included in the PSTN service data, connects the second legacy terminal 9 to the E1 line, and provides voice data in a TDM format included in the PSTN service data. (S170).

As described above, the present invention maintains various protocols (V5.2, ISDN PRI, R2, No7 signaling protocols) and subscriber network environment of PSTN legacy subscribers, and communicates with PSTN protocol interface and IMS network for communication with subscribers. The PSTN legacy subscriber is directly accommodated in the IMS network by configuring a media gateway including a SIP protocol interface.

Accordingly, it is possible to provide PSTN service through IMS network by minimizing additional network components, so that subscribers subscribed to PSTN service can be easily integrated and managed in a new communication environment, and time for network design and construction Can reduce the cost.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

The present invention enables the PSTN to be accommodated in the IMS network by minimizing additional network components while maintaining the protocol scheme and the subscriber network environment of the PSTN legacy subscriber, thereby easily integrating the subscriber accommodated in the PSTN into a new communication environment. Applicable to management.

1: application provider 3: authentication server
5: IMS (IP Multimedia Subsystem) 7: legacy terminal
10: Public Switched Telephone Network (PSTN)
12: RT (Remote Terminal) 22: PBX (Private Branch eXchange)
100: IMS Interworking Media Gateway
110: network interface 120: media processing unit
122: TDM / IP media converter 124: voice codec
126: DTMF processing unit 128: QoS management unit
130: IMS processing unit 132: SIP processing unit
134: SIP UAC / UAS processing unit 136: IMS CSCF interworking unit
140: media gateway controller 141: PSTN protocol processing unit
142: E1 line management unit 143: PBX line management unit
144: digit map management unit 145: tone generation unit
146: V5.2 port management unit 150: OAM processing unit

Claims (17)

Legacy terminal provided with a Public Switched Telephone Network (PSTN) service;
A relay device connecting the call line of the legacy terminal according to a call control signal to relay transmission and reception of voice data and PSTN service data including the call control signal;
Generates a SIP message according to the incoming and outgoing information of the call control signal received from the relay device, requests a session setup to a Call Session Control Function (IPMS) network of the IMS (IP Multimedia System) network, and the call processing controller And generating the call control signal according to the incoming and outgoing information of the SIP message received from the SIP device, and transmitting the call control signal to the relay device, and converting the PSTN service data and the data types of the IMS service data to each other. IMS-based legacy service system. The method of claim 1,
The relay device is an IMS-based legacy service system, characterized in that it comprises at least one of a remote terminal (RT) and a Private Branch eXchange (PBX). A network interface for transmitting and receiving data to and from the relay device and the IMS (IP Multimedia Subsystem) network;
A media processing unit which converts data types of the PSTN service data and the IMS service data;
An IMS processing unit generating a SIP message according to the originating and terminating information included in the call control signal, transmitting the SIP message to the call processing control unit of the IMS, and controlling session establishment according to the response of the call processing control unit;
And a media gateway controller for generating and transmitting a call control signal to the relay device according to originating and terminating information included in the SIP message. The method of claim 3,
The media processing unit,
And a TDM / IP media converter for converting data types of time division multiplexer (TDM) data transmitted and received to and from the relay device and packet data transmitted and received to and from the IMS network. The method of claim 3,
The IMS processing unit,
A SIP processing unit generating the SIP message to be transmitted and extracting call related data from the received SIP message;
A SIP UAC / UAS processing unit performing a user agent client (UAC) function for requesting session establishment and a user agent server (UAS) function in response to the session establishment request;
A subscriber registration processing unit for requesting service authentication to the IMS network for the outgoing and incoming information; And
And an IMS Call Session Control Function (CSCF) interworking unit controlling session establishment under the control of the call processing control unit of the IMS. The method of claim 3,
The media gateway controller,
And a PSTN protocol processing unit for generating a call control signal for controlling the line connection of the legacy terminal according to the originating and terminating information included in the SIP message. The method of claim 3,
The media gateway controller,
And a line manager configured to manage a line usage state of at least one of a remote terminal (RT) and a private branch eXchange (PBX) for controlling the line connection. The method of claim 3,
The call control signal generated by the media gateway controller includes at least one of a V5.2 protocol, an ISDN PRI protocol, an R2 protocol, and a No 7 signaling protocol. Transmitting, by a legacy terminal of a public switched telephone network (PSTN), a call setup request signal to a relay device;
Transmitting, by the relay device, a call setup request signal of the legacy terminal to an IP Multimedia Subsystem (IMS) interworking media gateway;
Generating, by the IMS interworking media gateway, a SIP message according to incoming and outgoing information included in the call setup request signal and transmitting the SIP message to a call session control function of an IMS network;
Establishing, by the call processing controller, a session with the IMS-linked media gateway according to the SIP message;
Receiving, by the IMS interworking media gateway, IMS service data through the session and converting the IMS service data into PSTN service data;
Transmitting, by the IMS interworking media gateway, the PSTN service data to the relay device; And
And transmitting, by the relay device, the PSTN service data to the legacy terminal. 10. The method of claim 9,
Transmitting, by the legacy terminal, PSTN service data to a relay device;
Transmitting, by the relay device, the PSTN service data to the IMS interworking media gateway;
Converting, by the IMS interworking media gateway, the PSTN service data into the IMS service data; And
The IMS interworking media gateway further comprises the step of transmitting the IMS service data through the session. Receiving a call establishment request signal of a legacy terminal from a PSTN relay;
Generating a SIP message according to incoming and outgoing information included in the call establishment request signal;
Transmitting the SIP message to a call session control function of an IMS network;
Establishing a session under control of the call processing controller;
Receiving IMS service data through the session and converting the IMS service data into PSTN service data; And
And transmitting the PSTN service data to the relay device. The method of claim 11,
Receiving the PSTN service data of the legacy terminal from the relay device;
Converting the PSTN service data into IMS service data; And
And transmitting the IMS service data through the session. The method of claim 11,
The step of establishing a session under the control of the call processing controller,
And establishing the session in association with a Call Session Control Function (CSCF) of the IMS. The method of claim 11,
Transmitting the PSTN service data to the relay device,
And transmitting the PSTN service data in at least one of a V5.2 protocol, an ISDN PRI protocol, an R2 protocol, and a No 7 signaling protocol. Receiving a SIP message;
Establishing a session according to incoming and outgoing information included in the SIP message;
Receiving IMS service data through the session and converting the IMS service data into PSTN service data;
And transmitting the PSTN service data to the called party legacy terminal according to the incoming and outgoing information included in the SIP message. 16. The method of claim 15,
The step of transmitting the PSTN service data to the legacy terminal of the PSTN according to the incoming and outgoing information included in the IMS service data,
And transmitting at least one of a V5.2 protocol, an ISDN PRI protocol, an R2 protocol, and a No 7 signaling protocol in a protocol manner. 16. The method of claim 15,
The step of transmitting the PSTN service data to the called party legacy terminal according to the incoming and outgoing information included in the SIP message,
Checking a line usage state of at least one of a remote terminal (RT) and a private branch eXchange (PBX) for controlling a line connection of the legacy terminal; And
And selecting an idle circuit among the circuits and transmitting the PSTN service data.

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