This Magic Quadrant evaluates network service providers (NSPs) that offer international network services to multinational companies (MNCs) with regional networks in Asia/Pacific. The providers focus on data services, especially Internet Protocol (IP) VPNs and, increasingly, Ethernet offerings. Most also offer voice services, especially voice over IP (VoIP) and IP telephony in association with I...

As the Internet and Internet technologies storm the world of communications, economic forces are driving IP to provide services well beyond what was originally intended. The simple flexible IP service model and the avoidance of the burdensome regulatory/contractual legacy of telephony have resulted in ubiquitous reach and greater economies. IP multicast promises to bring the same to group commu...

In August 2003 a small application called Skype was introduced on the Internet. It could be downloaded for free, and it enabled its users to make VoIP calls to each other free of charge. The most compelling feature of this application, in addition to being free, was that the voice quality was comparable to that of traditional fixed line telephony. Other applications such as MSN and Yahoo messen...

This chapter describes the support for IP based multimedia services on Third Generation (3G) wireless cellular networks. While earlier cellular networks offered only basic IP connectivity on a best-effort basis, 3G networks provide explicit support for real time multimedia services with guaranteed Quality of Service (QoS). As a result, they can offer traditional voice telephony, rich telephony ...

IP telephony gaining momentum and cellular telephony having several hundred million users, it seems inevitable that some future wireless telephony systems will be based on IP technology. What we know today as cellular phones may, in addition to telephony and video, have IP stacks, Web browsers, e-mail clients, net-worked games, and so on. If based on IP, telephony service will be much more flex...

Spam over Internet Telephony is becoming a large problem of the Voice over IP Architectures. Voice over IP has become a valid alternative to the Public Switched Telephone Network and it has a new paradigm for providing telephony services at a lower cost and higher flexibility. In the meantime, with Voice over IP the privacy becomes so hard and the benefits introduced are as strong as the securi...

In this paper we provide an extensive analysis of voice service in wireless IP networks. Voice traffic is serviced with priority over the rest of the traffic. Hence, we concentrate on the voice traffic in the analysis. We model the packetized voice traffic with Markov Modulated Poisson Process (MMPP), and we propose an analytical framework for its analysis in wireless networks. Also, we created...