• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.12 no.3
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• pp.224-230
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• 2019

In this paper, a new multiple servers conference service system using media control channel/distributed conference manipulation architecture has been presented. This conference service system can handle loads effectively from many conference participants. In this suggested architecture, media control channels are established between conference server, and distributed conference manipulation messages for distributing system loads are exchanged through this channels. These messages are transported between servers using media control channel created after stable transport sessions, and can be used to process server loads according to participants effectively. So this method can be used to implement large scale conference service system. For these purposes, formats of distributed conference manipulation messages which transmitted through media control channels are designed. and messages exchange procedures between conference servers are also presented. The performance of the proposed conference service system has been analysed by experiments, and the results show that the performances are improved according to participants.

• 한국정보통신설비학회:학술대회논문집
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• 2003.08a
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• pp.123-126
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• 2003

최근 컴퓨터 및 통신 기술의 발전으로 인터넷 전화 서비스가 증가하고 있다. 지금까지의 인터넷 전화 서비스는 1:1 방식의 서비스가 주류를 이루었으나, 점차 다자간 음성 채팅, 원격 강의 등과 같은 N:N 방식의 음성 컨퍼런스 서비스에 대한 수요가 급증하고 있다. 그러나 기존의 음성 컨퍼런스 시스템은 별도의 컨퍼런스 서버 구축, 부하 집중 사용자 수의 증가에 따른 음성 트래픽 증가 등의 문제로 일정한 통화 품질을 유지하기 어렵다는 단점이 있다. 따라서, 본 논문에서는 이와 같은 문제를 개선하기 위한 ad hoc 방식의 음성 컨퍼런스 시스템을 제안하였다. 그리고 이 시스템의 성능 분석을 통하여 최소 4명의 참여자까지 일정한 음성 품질이 보장됨을 확인함으로써 본 논문에서 제안하는 시스템의 타당성을 검증하였다.

• Journal of the Korea Society of Computer and Information
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• v.12 no.6
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• pp.187-192
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• 2007

Conference focus maintains and manages SIP(Session Initiation Protocol) signal connections with total conference participants, and it plays core functions of conference server. When the number of conference participants increases, conference focus restricts scalability of conference as increasing quantify of messages for processing. In this paper, to solve this problem. we propose a user system(conference information agent), which receives conference information from the conference focus and transfers them to the participants it manages. And we design and implement the total system including conference focus. When the conference information agent subscribe to the conference focus, it shows its possession of agent capability and capacity by using SIP SUBSCRIBE message. The conference focus informs to the other party by SIP response message that it was chosen as a conference information agent, and after that the conference focus sends all conference notification messages to it. So load of the conference focus can be reduced by this method. Finally, we have analyzed the performance of our system by experiments.

• The Journal of the Korea Contents Association
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• v.5 no.2
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• pp.257-266
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• 2005

As developing of the internet and computer technology, more interests are gathered to the conference service which provides capability of multi-party real-time visual conference. In this paper, we have designed and implemented a SIP-based visual conference system which includes Presence service. The elements of this conference system are user system, which has conference UA(User Agent) capability, presence seuer and conference server. For the presence service, we have adapted publication method which uses SIP PUBLISH message, and with this service various status informations of users are easily acquired. Also invitations and involvements to the conference are easily made through this service. For the conference server which controls establishment and management of multi-party connections, we have included conference event package. This package provides dynamically changing conference informations and users informations through SIP subscription and notification functions.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.576-579
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• 2003

Mutimedia conference technology provides reference service as well as data service via Internet. Many standards and related applications were developed based on H.323 protocol. but H.323 protocol more complex than SIP. so IETF have developed standard that related conference control based on SIP. In this paper, we discuss REFER method that used for conference invtitation and ejection esign conference event package for conference system based on SIP protocol.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.12
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• pp.2252-2258
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• 2016

CCMP(centralized conferencing manipulation protocol) enables adding and removing conference participants, changing their roles, adding and removing media streams in conference system. In this paper, by using extended CCMP, a new distributed conference system architecture which can be used to multiple servers distributed conference system in SIP(session initiation protocol) environment has been presented. In this study, according to increasing number of participants, a new extended CCMP architecture which can distribute conference system loads to multiple servers dynamically to decrease loads of servers has been designed. This extended CCMP architecture also can add dynamically new servers from the prepared servers pool. Furthermore, new conference information data format which can represent extended CCMP has been designed, and exchange procedures of extended CCMP control messages which can distribute loads between servers have also been presented. The performance of the proposed system has been analysed by simulation.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.789-791
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• 2012

모바일 디바이스 환경이 스마트폰으로 급속하게 변화하면서 다양한 스마트폰용 어플리케이션들의 등장과 함께 비즈니스의 패러다임도 함께 변화하고 있다. 본 논문에서는 스마트폰 단말기 환경에서 단말용 어플리케이션을 통해 오디오 컨퍼런스 시스템이 구현되는 방식을 다루고 있으며, 구현된 시스템에서는 클라이언트 어플리케이션과 컨퍼런스 시스템 간에 웹서버 연동을 위한 안드로이드 API 기술, 클라이언트 어플리케이션과 인증서버 간 Restful 방식의 서버개발 기술, 인증서버와 컨퍼런스 시스템 간 웹서버 연동기술, 서버 데이터 스케줄러 기술, Restful 방식의 서버호출/xml Parser 개발 기술, 이벤트 처리와 컨퍼런스 컨트롤을 위한 스케줄러 구현, 예약시스템을 위한 캘린더 연동 기술이 사용되었다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.379-381
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• 2002

본 논문은 한국전산원 차세대 인터넷 응용서비스 2차 과제로 선정된 "개인 이동성을 지닌 지능형 웹 컨퍼런스 개발"을 수행함에 따른 결과를 정리했다. 본 논문에서는 차세대 인터넷 환경에 적합한 고품질의 웹 컨퍼런스 시스템의 설계 및 구현에 대해 자세히 기술한다. 본 시스템은 한마디로 요약하면 SIP 기반의 웹 컨퍼런스로, 인스턴스 메신저, 회의 클라이언트, SIP 서버, 회의 서버 그리고 위치 서버로 구성된다.

• Journal of the Korea Society of Computer and Information
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• v.16 no.9
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• pp.123-129
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• 2011

In this paper, We have proposed a new distributed conference architecture which can reduce largely SIP(Session Initiation Protocol) messages exchanged between servers and participants in distributed conference environment by using resource lists which consist of conference participants URIs. This architecture can also reduce processing time and loads of conference servers. In our proposed method, the number of SIP messages required for participating in the conference can be largely reduced, and the number of SIP messages required for subscription of conference event package and maintaining sessions can also be largely reduced by using resource lists. Therefore expandibility of the conference system increases and network traffic can be reduced by using our conference architecture. And We also have proposed in this paper a new conference information data format with some added elements that are necessary for processing resource lists. Furthermore the procedure for dynamically adding conference servers to the conference environment has been suggested, and the exchanging process of SIP messages and conference information data between conference servers and conference participants has been also suggested. The performance of our proposed system has been evaluated by experiments.

• The Journal of the Korea Contents Association
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• v.6 no.2
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• pp.17-26
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• 2006

SIP(Session Initiation Protocol)-based centralized conference service model has advantage of easiness in conference management and service as compared to other models. However when media server which is one of the components of conference server is included in the conference server, this model shows disadvantage of high server work load with increasing numbers of conferences and participants. In this paper, to improve this problem, we have suggested and implemented a new conference service model in which an UA(User Agent) who first make the conference acts as a media server instead of conventional conference server and, the conference server with conference event package takes only part of management of the conference and its participants. Therefore, many more conferences can be held and managed compared to the conventional centralized conference service model because load of the conference server decreases in our suggested model md, furthermore the participants needs only make SIP call connections to the UA who first make the conference for establishing media session.