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In this paper we present a uniform negotiation and delivery mechanism for SIP-based conferencing system over IP network. With this mechanism rich innovative collaboration services can be developed conveniently to provide users with novel communication experience in IETF centralized conferencing (XCON) system. The mechanism adopts the extended SDP and offer/answer model as media description and negotiation...
There is a lack of general mail filtering system, which is not only compatible with several content-based filtering methods but also can realize automatic learning function by mail client. In this connection, this paper proposes GALMFS (general automatic learning mail filtering system). GALMFS realizes general design of mail filtering system through separating content-based filtering methods from...
In this paper we present a uniform negotiation and delivery framework for TCP-based data collaboration applications over IP network. With this framework rich innovative collaboration services can be developed conveniently and provide users with novel communication experience. The framework adopts the offer/answer model with extended Session Description Protocol as session description and negotiation...
SIP-based systems inherently have NAT traversal and QoS problems because of the limited IPV4 addresses and the best-effort service on the Internet. Using relay server to relay media stream can solve NAT traversal in SIP systems, but have less scalability. In this paper, we propose a SIP+P2P architecture for SIP-based systems to solve the above problems. In this novel architecture, light weighted SIP...
Because DDoS attacks destination servers from computers distributed all over network, it is very hard to locate attacking sources and resist DDoS. In this paper, a new defending mechanism based on registration and authentication against DDoS is proposed. By bidirectional warning messages, it can help locate attacking sources quickly and resist DDoS more exactly. According to the mechanism, all servers...
Streaming media services have been developing prosperously across cable network in recent years. Though wireless network becomes more and more popular in our lives, most of the technologies using in cable network are not suitable for wireless because of the differences between the physical layers of the two. In this survey, we summarized the wireless streaming media technologies studied in recent...
Virtual machines have emerged as an attractive approach for utility computing platforms because applications running on VMs are fault- and security- isolated from each other, yet can share physical machines. An important property of a virtualized utility computing platform is how quickly it can react to changing demand. We refer to the capability of a utility computing platform to quickly reassign...
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