• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.265-268
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• 2011

Voice over Internet protocol(VoIP) is support a VoIP service as All-IP method and Gateway method etc. All-IP method to the unit in an Internet environment by applying both the IP service is an VoIP system. Gateway method, using a normal phone call in a way that the Internet is using VoIP. In this paper, scanning and analyze the vulnerability for VoIP systems and networks from All-IP method and the Gateway method In the test bed. All-IP method and Gateway method found in the VoIP vulnerabilities, hacking attack, a denial of service attacks and VoIP spam attacks are carried out. Through analysis of post-attack security measures is proposed.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04b
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• pp.1459-1462
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• 2002

3GPP(Third Generation Partnership Project)와 3GPP2 등의 국제 표준화 기구에서는 초기 IMT-2000 망 구조로부터 All IP 망으로 진화할 것으로 예상하고 있다. 이에 본 논문에서는3GPP와 3GPP2를 중심으로 All IP 망의 기존에 제시된 All IP 망의 진화 시나리오를 분석하고, 이를 바탕으로 기존 PSTN/ISDN 연동, VoIP, Mobile IP 등과 같은 새로운 기술, 기존회선 모드 단말기 수용 등을 고려한 All IP 진화 시나리오에 따른 단계별 망 구조를 제시한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.4
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• pp.737-744
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• 2012

Recently VoIP has provided voice(both wired and wireless from IP-based) as well as the transmission of multimedia information. VoIP used All-IP type, Gateway type, mVoIP etc. Wired and wireless VoIP has security vulnerabilities that VoIP call control signals, illegal eavesdropping, service misuse attacks, denial of service attack, as well as wireless vulnerabilities etc. from WiFi Zone. Therefore, the analysis of security vulnerabilities in wired and wireless VoIP and hacking incidents on security measures for research and study is needed. In this paper, VoIP (All-IP type, and for Gateway type) for system and network scanning, and, IP Phone to get the information and analysis of the vulnerability. All-IP type and Gateway type discovered about the vulnerability of VoIP hacking attacks (Denial of Service attacks, VoIP spam attacks) is carried out. And that is a real VoIP system installed and operated in the field of security measures through research and analysis is proposed.

• Journal of IKEEE
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• v.5 no.1 s.8
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• pp.8-15
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• 2001

This paper remarks IETF based requirements for IP/UDP/RTP header compression issued in 3GPP2 All IP Ad Hoc Meeting and protocol stacks of the next generation mobile station. All IP Network, for real time application such as Voice over IP (VoIP) multimedia services based on 3GPP2 3G cdma2000. Frames for various protocols expected in the All IP network Mobile Station (MS) are explained with several figures including the bit-for-bit notation of header format based on IETF draft of Robust Header Compression Working Group (ROHC). Especially, this paper includes problems of IS-707 Radio Link Protocol (RLP) for header compression which will be expected to modify in All IP network MS's medium access layer to accommodate real time packet data service[1]. And also, since PPP has also many problems in header compression and mobility aspects in MS protocol stacks for 3G cdma2000 packet data network based on Mobile IP (PN-4286)[2], we introduce the problem of solution for header compression of PPP. Finally. we suggest the guidelines for All IP network MS header compression about expected protocol stacks, radio resource efficiency and performance.

• 한국정보통신설비학회:학술대회논문집
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• 2009.08a
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• pp.68-71
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• 2009

All-IP network requires change of the existing IP network engineering methods as the convergence service market between communication and broadcasting industries using IP network is growing rapidly. Especially the video services like IPTV require more strict transmission quality and higher bandwidth than the existing data services. So it is difficult to design All-IP network by the over-provisioning method which used to be used for the existing IP network design. It also requires a heavy investment which becomes one of big obstacles to the IPTV service expansion. In order to reduce the investment costs, it is required to design an optimized network by maximizing the utilization of the network resources and at the same time maintaining the customer satisfaction in terms of service quality. In this paper, we first analyze the effects of IPTV traffic on the existing internet. Then we compare two traffic engineering technologies, which are dimensioning without admission control and dimensioning with admission control, on the All-IP network design by simulation. Finally, we suggest cost effectiveness of traffic engineering technologies for designing the All-IP network.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.109-111
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• 2003

본 논문은 최근 활성화되고 있는 VoIP 서비스 기술에 이동성을 보장하기 위해 Mobile IP기술을 접목시킨 시스템을 설계하고 개발한다. PDA와 같은 임베디드 시스템의 제한된 자원을 효율적으로 이용하기 위한 VoIP 서비스용 시스템에 필요한 요구사항과 문제점들을 분석하고 해결책을 제시한다. 또 이동환경에서의 VoIP 서비스를 제공하기 위해 Mobile IP 통신 모듈을 선계하고 구현한다. 유무선 통합 실험망을 이용하여, 개발된 Mobile IP 기반 VoIP시스템의 기능을 검증하고 향후 방안을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.04a
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• pp.581-584
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• 2010

Based on superspeed nation-wide communication infrastructure, high speed and high quality ALL IP communication network is created. It is a point in time where such infrastructure allows residential and commercial phones to be ported from PSTN to IP network. The problem experienced on IP phones in ALL IP environment and IMS server products are not easily approachable and dealt with. Therefore, this paper discusses approaches used in analyzing and resolving problems before they actually occur. This paper first discusses briefly the IP phones used in IMS network and their related problems. Then next topic deals with characteristics of these problems and current status. Last but not least, the causes of the problems are analyzed and solutions to these problems are introduced. Also discussed are solutions to possible future issues followed by conclusion.

• Electronics and Telecommunications Trends
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• v.15 no.6 s.66
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• pp.26-34
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• 2000

차세대 이동통신 표준화를 주도하는 ITU 및 3GPPs에서는 모든 데이터 트래픽과 시그널링의 전송에 IP를 이용하는 All-IP 네트워크의 표준화를 추진하고 있다. 그러나 All-IP 네트워크에서는 아직 해결해야 할 문제점을 많이 가지고 있으며 그 중 효율적인 이동성 관리 문제는 All-IP 네트워크의 실현을 위하여 반드시 해결되어야 할 과제 중의 하나이다. 본 고에서는 IP 망에서의 효율적인 이동성 관리를 위해 최근 이슈가 되고 있는 마이크로 이동성 관리 기술의 연구 동향에 대하여 살펴본다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.447-448
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• 2009

VoIP 서비스에서 긴급 통화 서비스를 제공하기 위해서는 PSTN 망에 있는 소방서와 같은 긴급 서비스 센터에게 호를 연결한다. PSTN 망에 있는 긴급 서비스 센터를 통해 제공되는 VoIP 긴급통화 서비스는 VoIP 서비스가 가지고 있는 여러 멀티미디어 서비스를 사용할 수 없다. 이러한 문제를 해결하기 위해서는 모든 구성요소가 IP 망에서 제공되어야 한다. 본 논문에서는 모든 구성요소가 IP 망에서 제공되는 All-IP 기반 VoIP 긴급통화 서비스를 제공하기 위한 프로토타입을 구현하였다.

• Proceedings of the IEEK Conference
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• 2002.06a
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• pp.97-100
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• 2002

In this paper, we analyze All IP network architecture and VoIP Service procedure using U Multimedia domain. And, we propose QoS Resource management scheme using with statistical measurement based admission control 8l rate based borrow bandwidth to improve real-time traffic QoS guarantee.