KR101708050B1 - Public Address Management System, and method for updating location information using the same - Google Patents

Public Address Management System, and method for updating location information using the same Download PDF

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Publication number
KR101708050B1
KR101708050B1 KR1020150190469A KR20150190469A KR101708050B1 KR 101708050 B1 KR101708050 B1 KR 101708050B1 KR 1020150190469 A KR1020150190469 A KR 1020150190469A KR 20150190469 A KR20150190469 A KR 20150190469A KR 101708050 B1 KR101708050 B1 KR 101708050B1
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South Korea
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pams
call
endpoint
sip
database
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KR1020150190469A
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Korean (ko)
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배광수
박아림
최예슬
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메스코(주)
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1063—Application servers providing network services
    • H04L65/1006—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1046—Call controllers; Call servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/608—

Abstract

The present invention relates to a public address management system (PAMS) and a method for updating location information using the same. The present invention comprises: a UI module for supplying function for endpoint, group, setup, and help; a call manager for controlling a call; and an SIP stack module performing processing function including call-leg, call, session description protocol (SDP), and real-time transport protocol (STP). The present invention maximizes a system backup effect when rebooting a server caused by a stack error and a manager request.

Description

PAMS, and a method for updating location information using the PAMS,

The present invention relates to a PAMS and a method for updating location information using the PAMS. More particularly, the present invention relates to a PAMS, and more particularly, A PAMS for improving the speed of data transmission in the case of broadcasting, and a method for updating location information using the PAMS.

In accordance with the development of the Internet, various multimedia information such as voice, audio, video and data is provided to subscribers in an IP multimedia subsystem (IMS) network through an internet protocol (IP) based packet network.

In particular, a Voice over Internet Protocol (VoIP) terminal for transmitting voice information using an IP (Internet Protocol) is an IP telephone communication technology that inserts voice information into discontinuous packets in the form of digital signals, . Currently, there are various environments such as wired LAN environment, WIFI environment, wireless Internet environment, and the like in which an Internet telephone (VoIP) can be connected.

As an example of checking the status of each device in a PA (Public Address) / GA (General Alarm) network if a number of sub-units (endpoints) using IP are connected through a single Ethernet cable, It is anticipated that the performance of PA / GA Network Safty Monitoring cycle will be improved because it provides concurrent performance of 10,000 ~ 20,000 company subscribers based on SIP-based exchange equipment, have.

Korean Patent Registration No. 10-0643292 entitled " Method for managing address information of a session initiation protocol terminal user and server therefor " Korean Patent Registration No. 10-0650978 entitled " Home Network Device Having Location Information Update Function According to Dynamic Address Change Detection and Home Network Terminal and Method Thereof "

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide an apparatus and a method for connecting a plurality of sub units (Endpoints) with a single Ethernet cable, And a method for updating location information using the PAMS.

Further, in order to hold fixed information inputted by a user in an endpoint database of a Sub Unit (Endpoint), the location database of the PAMS may be used as the information by the Register message instead of the information by the user PAMS to keep location information before restart by combining location database information with endpoint database data structure by using information of location database by using information of location database by registering and database, and updating location information using it .

In addition, the present invention is to provide a PAMS for maximizing the system backup effect when a system failure occurs and a server reboot (restart) by an administrator request through a database structure of a location database, and a method for updating location information using the PAMS.

However, the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a PAMS according to an embodiment of the present invention is a PAMS (Public Address Management System) for connecting a plurality of sub units (Endpoints) using one Ethernet cable, In order to implement the broadcast function and the one-to-one voice communication function included in the voice communication, which is the main function of the PAMS 100, a screen for the PAMS is configured as a part for the user and the administrator to confirm intuitively for setting, A UI module that connects the process to the call manager and provides Endpoint, Group, Setup, and Help functions with additional menu functions; A call manager which is connected to a Session Initiation Protocol (SIP) endpoint among sub-units (Endpoints) to perform call control including call connection / release of requested call and separation / processing of group call and general call; A SIP stack module that implements processing functions including CallLeg, Call, Session Description Protocol (SDP), and RealTime Transport Protocol (RTP) as classes implementing the SIP protocol; And a control unit.

At this time, the call manager sets the default value of the broadcast communication as the broadcast communication, and further provides the one-to-one voice communication.

In addition, the SIP stack module assigns a class name to each function of the PAMS according to each function of the PAMS. Through the Call class, the SIP stack module manages the inbound and outbound collets of each endpoint, Media relay management in case of group call, inbound and outbound collet association in general call, inbound in group call and group collation association.

In addition, the SIP stack module can store the main head information of the SIP message, the manager data structure of the logical call corresponding one-to-one with the unit transaction constituting the call, the collation of the inbound call of the call through the CallLeg class, , Timer information management, and call status information management.

In order to accomplish the above object, a method for updating location information using PAMS according to an embodiment of the present invention is a location database operated separately by PAMS, which includes an Internet address, which is real time location information for SIP message delivery of a sub unit Registering location information in an endpoint database when a sub-unit (Endpoint) is created in order to store a port number, and transmitting a register message to the PAMS; Performing a location information registration update of the end point database (PAMS), and generating and updating information of the location database; And a third step of the PAMS transmitting a Register Registration OK message (Register 200 OK) to the Sub Unit (Endpoint). .

In this case, the second step may include: (2-1) the PAMS performing an endpoint database upload according to the start of the PAMS service; A step 2-2 of the PAMS performing the location database upload; And a step (2-3) of the PAMS performing location information update for an endpoint database of the SIP endpoint; .

The PAMS according to the embodiment of the present invention and the location information updating method using the PAMS according to the embodiment of the present invention provide a merit of less electrical interference by connecting a number of sub units (Endpoints) with one Ethernet cable, It provides the effect of improving the speed of data transmission.

In addition, the PAMS according to another embodiment of the present invention and the method for updating location information using the PAMS according to another embodiment of the present invention may be implemented in a PAMS (End-Point Database) The location database is automatically registered with the information by the register message instead of the information by the user, so that the information of the location database can be utilized by connecting the information of the location database with the endpoint database data structure at the time of restarting the system, The present invention provides an effect that can be maintained.

In addition, the PAMS according to another embodiment of the present invention and the location information updating method using the same can maximize the system backup effect when a server failure Effect.

1 is a view for explaining a PAMS concept according to an embodiment of the present invention;
2 is a diagram illustrating a system package structure of a PAMS according to an embodiment of the present invention.
3 is a diagram showing a class structure of a PAMS according to an embodiment of the present invention.
4 is a diagram showing a concept of implementation of a call for each call (general call, group call) of PAMS according to the embodiment of the present invention.
5 is a diagram illustrating a service structure for a Group Call (one-to-many broadcast communication) function of a PAMS according to an embodiment of the present invention.
6 is a diagram illustrating a service structure for an endpoint call (one-to-one voice communication) function of a PAMS according to an embodiment of the present invention;
7 is a diagram illustrating a location information update method for designing a location database structure by PAMS according to an embodiment of the present invention;
8 is a flowchart illustrating a process of changing an endpoint DB registration information of a location database by PAMS according to an embodiment of the present invention.
9 is a reference diagram illustrating an embedded-based concept of a PAMS according to an embodiment of the present invention.
10 illustrates a system configuration diagram of a PAMS according to an embodiment of the present invention.
11 is a system configuration diagram for PAMS driving according to an embodiment of the present invention.
12 to 15 are views showing a UI screen implemented in a PAMS according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of preferred embodiments of the present invention will be given with reference to the accompanying drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In the present specification, when any one element 'transmits' data or signals to another element, the element can transmit the data or signal directly to the other element, and through at least one other element Data or signal can be transmitted to another component.

1 is a diagram for explaining a concept of a Public Address Management System (PAMS) 100 according to an embodiment of the present invention. Referring to FIG. 1, the PAMS 100 solves the problem of connecting a plurality of cables to connect various existing devices by reducing the use of a plurality of cables and using an Ethernet cable, Ethernet cable Use only one connection to connect all devices. In addition, the PAMS 100 utilizes an Ethernet cable, allowing for faster data transmission while also providing the advantage of less electrical interference.

In order to implement the broadcast function and the one-to-one voice communication function included in the voice communication, which is the main function of the PAMS 100, the system overall package structure of the PAMS 20, the class structure for the PAMS 100 development, The service structure (one-to-one communication, one-to-many broadcast communication) and the database structure in PAMS that should be designed for service implementation are presented.

2 is a diagram showing a system package structure of the PAMS 100 according to an embodiment of the present invention. Referring to FIG. 2, in order to implement the voice communication of the PAMS 100 (the main function of broadcasting, optional one-to-one voice communication), three types of UI (User Interface) module 100a, ) 100b, and a SIP (Session Initiation Protocol) stack (SIP Stack) module 100c.

First, the UI module 100a is configured to intuitively check the screen of the PAMS 100 for a user and an administrator to set up, and connects the processing of events to the call manager 100b. The UI module 100a provides Endpoint, Group, Setup, and Help functions with an additional menu function.

The call manager 100b is connected to the SIP endpoint to perform call control such as connection and release of a requested call and separation and processing of a group call and a general call.

The SIP stack module 100c is a class that implements the SIP protocol and functions as a CallLeg, a Call, a Session Description Protocol (SDP), and a RealTime Transport Protocol (RTP).

3 is a diagram showing a class structure of a PAMS 100 according to an embodiment of the present invention. Referring to FIG. 3, the functions of the PAMS 100 are classified according to classes, class names are allocated according to functions, and the overall flow of classes is shown. The concept of implementation of calls by calls (general call, group call) is shown .

First, Call (1) is used to manage inbound and outbound collages of each endpoint (subunit), group collage management, media relay management in group call, general call inbound and outbound collage association, inbound group call And a class having a group collation association function.

Next, CallLeg (2) is used to store the header information of the SIP message, the timer information management, the management information structure of the logical call corresponding to the one-to-one correspondence with the unit transaction constituting the call, the chore of the inbound call of the call, , And corresponds to a class having a call status information management function.

GroupCallLeg (3) corresponds to a class having an outbound CallLeg list management of a group call, a member collet generation of a group call, and a comparative search function.

The MediaDescription (4) corresponds to a class having an audio media description part included in the SDP, a video media description part included in the SDP, and a function of generating a new SDP based on the analyzed existing SDP.

In case of group call, MediaAddress (5) is transmitted through the media relay of the server. In this case, the MediaAddress (5) corresponds to the class having the function of managing the Internet address for media delivery of the server.

SIPStack (6) is a SIP protocol that defines basic definitions of SIP protocol, protocol version, protocol revision, protocol transport protocol type, signal port, supported method, timer information, header type, registration state definition, It corresponds to SIP Stack class such as call direction definition, media type definition, codec type definition, media flow definition.

SIPmd5 (7) corresponds to a class having an algorithm for obtaining the response value of Authorization header used in call authentication or registration authentication.

The SIP message (8) corresponds to a class that manages the SIP message pool as an element, the source address of the SIP message, and the parsing object of the SIP message.

Parser (9) parses the SIP Stack core functional class, SIP Message, and determines the message type and meshed type and parses each header. Parser is also a class that determines SDP Body parsing and CallLeg location.

MainActivity (10) corresponds to the Entrance Main class of the Android program. It handles UI interface and defines and creates all classes related to SIP Stack. The MainActivity 10 corresponds to a class communicating with an end point dialog opening / closing function, a group dialog opening / closing function, a setting dialog opening / closing function, a help dialog opening / closing function, and a SIP Stun service class.

CmPiper (11) corresponds to a messenger class handler class for sending and receiving Message objects between a SIPStun class, which is a service class, and a MainActivity, a service client.

The SIPStun (12) corresponds to the service class of the SIP Server. It runs in the background like a thread. It creates all SIP related objects, REGISTER message pool and message processing, CALL message pool and message processing, and various database creation and access functions. Class.

The SipSignalReceiver 13 is configured to process network data that is a function of sending and receiving an SIP message, store the received message as a pool, and inherit from a thread class.

In addition, classes such as Notify, Options, and Prack that are expressed in the class diagram but not in the class description are provided for upgrading the function version of the PAMS (100).

FIG. 4 is a diagram illustrating an implementation concept of a call for each call (general call, group call) of the PAMS 100 according to an embodiment of the present invention. FIG. 5 is a diagram illustrating a service structure for a Group Call (One Broadcast Broadcasting) function of the PAMS 100 according to an embodiment of the present invention. 6 is a diagram illustrating a service structure for an endpoint call (one-to-one voice communication) function of the PAMS 100 according to an embodiment of the present invention.

4 and 5, in the case of voice communication (broadcast communication and one-to-one communication), that is, Group Call (one-to-many broadcast), which is the main function of the PAMS 100, the PAMS 100 ) In the group ID registered in the group ID. The PAMS 100 broadcasts voice packets through a media relay 200. The PAMS 100 not only transmits the caller's broadcast but also the voice communication of each member to the caller only for the first receiver when the signal connecting sound is transmitted to each member of the group call group .

Referring to FIG. 6, in the case of an endpoint call (one-to-one voice communication), when the PAMS 100 is called with the ID of a registered SIP endpoint, the voice data is transmitted in an endpoint to endpoint communication manner. When a caller of a sub unit (Endpoint) 300 calls a receiver of a sub unit (Endpoint) 300 in a state where each Sub Unit (Endpoint) 300 is connected to the PAMS 100 first, the RTP datagram It corresponds to the manner in which the communication proceeds.

7 is a diagram illustrating a location information update method for designing a location database structure by the PAMS 100 according to an embodiment of the present invention. The PAMS 100 separately manages the location database 110 storing the real-time location information for the SIP message delivery of the sub-unit (the endpoint) 300, that is, the Internet address and the port number, . It is designed to minimize the load on the database system by storing a minimum amount of information. Since the position information of the sub unit (Endpoint) 300 is volatile, the position information that is changed in real time in addition to the information stored by the user is not stored in a database.

As a result, when the system is down or rebooted by the user, the location information is lost until it is registered by the Register message, and reception of the new call is impossible.

If the endpoint database holds the fixed information inputted by the user, the location database 110 is automatically registered with the information by the Register message instead of the information by the user, and is converted into a database.

By using this information, information of the location database 110 is combined with the endpoint data structure when the system is restarted, so that the location information before re-operation can be maintained.

The advantage of this is that the location database (110) structure can be designed to maximize the system backup effect when a system failure or a server reboot (restart) by an administrator request is made.

That is, referring to the flow of the function with reference to FIG. 7, the relationship between the location database 110 and the location database 110 at the time of creation and modification of the endpoint database, the destruction of the location database 110, The use of the location database 110 of FIG. First, when the endpoint database is created, it is registered in the endpoint database, and there is no endpoint location information at this time. When the PAMS 100 transmits the Register message to the PAMS 100, the PAMS 100 updates the endpoint database location information registration (S20) and the location information of the location database (110) (S30), and transmits a Register Registration Complete message (Register 200 OK) to the Sub Unit (Endpoint) 300 (S40).

8 is a flowchart illustrating an endpoint DB registration information change process of the location database 110 by the PAMS 100 according to an embodiment of the present invention. Referring to FIG. 8, the PAMS 100 performs an endpoint database upload (S120) according to the start of the PAMS service (S110). After the PAMS 100 uploads the location database 110 (S130), the PAMS 100 adds the information of the location database 110 to the endpoint data structure through the update of the location information of the endpoint database of the SIP endpoint (S140) The position information before re-operation can be maintained.

9 is a reference diagram illustrating an embedded-based concept of the PAMS 100 according to an embodiment of the present invention. 10 is a diagram showing the system configuration of the PAMS 100 according to the embodiment of the present invention. 9 and 10, the SIP + Ship Moniter Protocol 120 is designed so that the number of connectable stations in the PAMS 100 is 10,000, and the number of simultaneously controllable stations in the PAMS 100 is 1,000 .

The PAMS 100 includes an Alarm Generator Unit 131, an Alarm Network Monitoring Unit 132, a Power Supply Unit 133, and the like, by potting the Sub Unit S / W Interface Component 130 as an embedded hardware platform. Although not shown, it has a Smart Control Unit.

That is, the alarm generator unit 131 corresponds to a panel device that generates an emergency alarm defined by the IMO regulations by pressing a button of the alarm generator unit 131 when a situation occurs.

The alarm network monitoring unit 132 corresponds to a panel device for monitoring the network status related to the alarm.

The Power Supply Unit (133) is one of the basic functions of the PA / GA specified by the IMO and corresponds to a device for stabilizing the power of the main system.

The Smart Control Unit is a device that allows the administrator to control the PA / GA in a Smart Unit or an IMO-specified bridge unit in the event of an emergency through a SAN.

The PAMS 100 includes a Fire / Gas system 141, a Bridge navigational watch alarm system 142, and an entertainment system 143 by potentiating the System Integration Component 140 to an embedded hardware platform.

In addition, the PAMS 100 can implement alarm grouping, alarm network monitoring, power supply status monitoring, Smart Control Unit registration, and system integration through the design and implementation of the main menu of the GUI 150.

11 is a system configuration diagram for driving the PAMS 100 according to an embodiment of the present invention. 11, the PAMS 100 basically includes a board for installing a PAMS software, a HUB (Switch) 400, an AP 500, a Smart Phone 600, an IP phone 700, an IP speaker Intercom) 800, and each voice communication device is registered in the PAMS 100 through the HUB 400 and is capable of communication.

12 to 15 are views showing UI screens implemented in the PAMS 100 according to the embodiment of the present invention. 12A shows a PAMS manager screen on the main screen of the PAMS 100. FIG. 12A, it can be seen that the number of endpoint additions, the number of actual device registrations, the number of recent calls, and the traffic status are continuously output in the central portion of the main screen, and when the status output portion is clicked, a button is generated at the bottom of the screen .

12B shows an endpoint setting screen, and a setting window for adding, modifying, and deleting an account of the endpoint is displayed.

13A is a group setting screen, in which a plurality of endpoints are logically grouped into one group, and a setting window for setting, modifying, and deleting a group for implementing a broadcasting function is displayed.

13B is a UI screen showing a setting window in which members in the Group can be added and deleted.

14A is a PAMS S / W setting window, and a window for setting the PAMS program itself is displayed.

14B shows a window with a brief description of the PAMS as a Help window.

The present invention can also be embodied as computer-readable codes on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored.

Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device and the like, and also implemented in the form of a carrier wave (for example, transmission over the Internet) .

The computer readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. And functional programs, codes, and code segments for implementing the present invention can be easily inferred by programmers skilled in the art to which the present invention pertains.

As described above, preferred embodiments of the present invention have been disclosed in the present specification and drawings, and although specific terms have been used, they have been used only in a general sense to easily describe the technical contents of the present invention and to facilitate understanding of the invention , And are not intended to limit the scope of the present invention. It is to be understood by those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

1: Call 2: CallLeg
3: GroupCallLeg 4: MediaDescription
5: MediaAddress 6: SIPStack
7: SIPmd5 8: SIPMessage
9: Parser 10: MainActivity
11: CmPiper 12: SIPStun
13: SipSignalReceiver 100: PAMS
100a: User Interface (UI) module
100b: Call Manager
100c: SIP Stack module
110: Location database
120: SIP + Ship Moniter Protocol
130: Sub Unit S / W Interface Component
131: Alarm Generator Unit
132: Alarm Network Monitering Unit
133: Power Supply Unit
140: System Integration Component
141: Fire / Gas System
142: Bridge navigational watch alarm System
143: Entertainment System 150: GUI
200: media relay
300: Sub Unit (Endpoint) 400: HUB (Switch)
500: AP 600: Smart Phone
700: IP telephone 800: IP speaker (Intercom)

Claims (6)

1. A public address management system (PAMS) for connecting a plurality of sub units (endpoints) using one Ethernet cable,
In order to implement the broadcasting function and the one-to-one voice communication function included in the main function of PAMS, voice communication, the user and the manager intuitively check the setting for the PAMS screen, and the processing of the events is called the call A UI module that connects with the manager and provides endpoint, group, setup, and help functions with additional menu functions; And
A call manager which is connected to a Session Initiation Protocol (SIP) endpoint among subunits (Endpoints) to perform call control including connection and release of requested calls and separation and processing of group calls and general calls; And
SIP stack module that implements the processing functions including CallLeg, Call, Session Description Protocol (SDP), and RealTime Transport Protocol (RTP) as the classes implementing SIP Protocol; ≪ / RTI >
The SIP stack module includes:
The CallLeg class provides a chore of the inbound call of the call, an outbound call collision of the call, a manager data structure of the logical call corresponding one-to-one with the unit transaction that constitutes the call, the main head information of the SIP message, the timer information management, Management of the PAMS.
The call manager of claim 1,
Characterized in that the voice communication provides a one-to-one voice communication with the default value of the broadcast.
The SIP stack module of claim 1,
PAMS functions are assigned class names according to their functions. Call classes are used to manage inbound and outbound collages of each endpoint (subunit), group collage management, media relay management for group call, The inbound and outbound collet association, the group call inbound, and the group collet association are performed in the general call.
delete In order to store the Internet address and port number, which are real-time location information for SIP message delivery of Sub Unit (Endpoint) to a location database operated separately by PAMS, when a Sub Unit (Endpoint) Registering location information in an endpoint database and transmitting a Register message to the PAMS;
Performing a location information registration update of the end point database (PAMS), and generating and updating information of the location database; And
A third step of the PAMS transmitting a register registration completion message (Register 200 OK) to the sub unit (Endpoint); , ≪ / RTI &
The second step comprises:
A step 2-1 in which the PAMS performs an endpoint database upload according to the start of the PAMS service;
A step 2-2 of the PAMS performing a location database upload; And
A step 2-3 of the PAMS performing location information update for an endpoint database of the SIP endpoint; And updating the location information using the PAMS. delete
KR1020150190469A 2015-12-30 2015-12-30 Public Address Management System, and method for updating location information using the same KR101708050B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100643292B1 (en) 2005-04-29 2006-11-10 삼성전자주식회사 Method for managing address information of user who uses session initiation protocol terminal and server for the same
KR100650978B1 (en) 2004-12-01 2006-11-29 한국전자통신연구원 Home network device, Home network terminal and its method for providing function of updating location information according to change of dynamic address
KR20090010878A (en) * 2007-07-23 2009-01-30 삼성전자주식회사 All-in-one voice of ip system including multi-function and method of processing signalling therefor
US20130094642A1 (en) * 2011-10-14 2013-04-18 Rawllin International Inc. Call scheduling system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100650978B1 (en) 2004-12-01 2006-11-29 한국전자통신연구원 Home network device, Home network terminal and its method for providing function of updating location information according to change of dynamic address
KR100643292B1 (en) 2005-04-29 2006-11-10 삼성전자주식회사 Method for managing address information of user who uses session initiation protocol terminal and server for the same
KR20090010878A (en) * 2007-07-23 2009-01-30 삼성전자주식회사 All-in-one voice of ip system including multi-function and method of processing signalling therefor
US20130094642A1 (en) * 2011-10-14 2013-04-18 Rawllin International Inc. Call scheduling system

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