Abstract The Peer-to-Peer (P2P) paradigm provides an alternative design approach for
distributed systems, which relaxes the requirement for dedicated service providers as it is …

Communication in open packet-based networks like the Internet must be considered
including security aspects. Different approaches exist to realize eg confidentiality in IP …

The conventional Public Switched Telephone Network (PSTN) is a circuit switched network
in which calls are assigned dedicated circuits during the duration of the call. Such networks …

IP Telephony is a demanding interactive real-time service that already supplements the
traditional telephony system to a considerable extent. It is expected to become a genuine …

PDAs have become an accessory that a large communiiy uses for managing their personal
data. With the development of new devices with additional network und audio capabilities …

這幾年來, 有很多的力量正驅使著系統供應商提供整合的服務. 第一, 消費者希望在各式各樣的
機器上面可以享受到統一的服務. 第二, 消費者希望可以不管使用的是哪一種接取服務 …

隨著網路技術及終端設備的快速發展, 未來的網路電話(VoIP) 的環境將傾向於發展成為一個支援
多類網路的聚合環境. 這些網路將包含公眾交換網路(PSTN), 公用陸地行動通訊網(PLMN) …

The traditional circuit-switched telecommunication network and the packet-switched data
network are converging to a single packet-switched network. One important application of …

Both of SIP and H. 323 are widely used in VoIP. H. 323 has wonderful structure. With H. 323,
it is easy to establish and control a call. SIP is a text based protocol. Although it is simpler …

Kommunikation nimmt in unserem täglichen privaten und geschäftlichen Umfeld eine
zentrale und unerlässliche Stellung ein. Dem Nutzer steht hierfür eine Vielzahl von …