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VoIP CONCLUDING REMARKS
2007-06-06 19:13:00
Implementation of VoIP is growing rapidly. There will also be further convergence of media, data, voice and video. In order to achieve these further levels of convergence, interoperability and continued work on standards will be critical. SIP is emerging as the major protocol to underpin IP-based advanced services. Another key driver will be the development of wireless VoIP, which will provide students and staff with different ways to access learning environments while integrated services will open up the possibilities of ubiquitous computing. In future, learning may take place in a shared virtual world of social computing, similar to an online, multiplayer game, and VoIP will be one of the components of such an environment. VoIP gateways have become the world's de facto standard in building voice and video over IP products and services. These gateways provide real-time voice and video IP communications. Many large SMEs are already looking to VoIP service providers for thei...
More About: Voip , Marks

VoIP in Thailand and South East Asia
2007-06-06 19:12:00
There are two Telecom Providers in Thailand . TOT Corporation (formerly, the Telephone Organization of Thailand) to serve a Domestic voice communications and CAT Corporation (formerly, the Communication Authority of Thailand) serves an International voice communications and Data communications. TOT and CAT are both operators and regulators. They give concessions based on the BTO scheme to winning bidders on selected services. The concessions could be of the same kind due to overlapping roles and authority. QoS of VoIP in Thailand. No QoS enforced both in terms of latency and accessibility. TOT VoIP domestic service claims to have delay comparable to that of mobile phones. CAT VoIP international service still faces problems about accessibility and latency. Future Directions (Thailand) The establishment of the National Telecommunications Committee (NTC) as an independent regulatory body. The Telecommunications Act is in the approval process from the Parliament. Long-...
More About: Asia , Voip , East , South

The Benefits of VoIP
2007-06-06 19:11:00
In basic terms, it can lower the phone bills, deliver a wider range of unique services and improve employee productivity. But while cost savings are keys, enhanced functionality and mobility are also huge factors in VoIP?s growing appeal. VoIP simply does things that are extremely expensive, or even impossible, with traditional phone networks. For example, many users enjoy the convenience of having their voicemail system notify them by text-message or e-mail whenever a new message arrives. Best of all, most VoIP providers offer flat-priced bundles for both high-speed data and voice. One fixed monthly cost provides a fast, reliable Internet connection, as well as unlimited local and long-distance calling. While the initial investment in specialized VoIP equipment could involve significant up-front cost, that equipment generally pays for itself by reducing voice and data service costs and eliminating long-distance calling costs, within the first 12-18 months or even sooner. C...
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Peer-to-peer networking (e.g. Napster, Kazaa, Skype)
2007-06-01 16:48:00
The type of VoIP implementation most well known to consumers and students uses client-based, peer-to-peer (P2P) technologies such as Napster and Skype (Jones, 2005). P2P systems are far more decentralized than other networking or computer systems, with little or no reliance on the idea of clients being served by a central server. Clients (individual computers or telephony end points) act as nodes and are as likely to be ?providing? resources to other nodes (its peers) as to be consuming them from other nodes. It is fairly well known within higher and further education that such client-based P2P applications can cause problems on IP networks because they make it much harder to manage the use of bandwidth and to exercise some level of control over the use of the network. There are particular problems with applications such as Kazaa and Napster, which are used to download music, films and games and the challenge is growing with the further development of P2P applications such as Bi...
More About: Networking , Peer-to-peer , Peer , Peer to Peer

Technology, standards and challenges
2007-06-01 16:47:00
As already mentioned, the traditional PSTN telephone infrastructure has been built up over the last one hundred years or so and has developed into a highly reliable voice communications system. In contrast, VoIP is a relatively new technology with a fledgling architecture that is built on inherently less reliable data networks. This means that there are therefore justifiable concerns around the extent to which it is deployed. The purpose of this section is to examine the underlying protocols and technologies used in VoIP and to discuss the potential challenges inherent in their deployment.
More About: Standards , Technology , Allen , Stand , Ology

How VoIP is used, its background and history
2007-06-01 16:44:00
Most people are aware of VoIP through the Skype consumer telephone service which has gained large-scale public recognition recently, particularly since its purchase by Ebay. However, VoIP has not suddenly appeared in the last few years as an opportunity afforded by the World Wide Web. Skype is only one particular implementation of VoIP and its related technologies and it is important to understand that VoIP has an important technological history, intertwined with the telecommunications industry in general, in order to appreciate the complexities of VoIP technologies and applications. The idea of voice over IP has been discussed since the 1970s but it was the mid-1990s before commercial products became available with the introduction, in 1995, by Israeli company Vocaltec, of the first commercial system (Varshney et al., 2002). These early VoIP systems were designed to connect one PC to another and required each PC to have a sound card, speakers, microphone, mode...
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What you need to make a VoIP cal
2007-06-01 16:40:00
To make a VoIP call, the consumer user requires VoIP software and a broadband connection to the Internet. The software will handle the call routing to make sure the call reaches the intended destination as well as providing the codec. The software can be installed on a variety of hardware devices including traditional telephone handsets (using an adaptor that plugs into the telephone) or a PC or wireless device such as a Personal Digital Assistant (PDA). This use of software-enhanced end-user devices is one of the key distinguishing features of VoIP. Whereas the traditional telephone system contains its 'intelligence' within the network, VoIP makes use of the Internet model of intelligence at the edge of the network. This is often known as the end-to-end principle. In order to make a call, an account with a VoIP service provider is also required. Different types of VoIP service are available, including services from traditional telephone carriers such as BT, and from specializ...
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How VoIP works
2007-06-01 16:29:00
The Basics The basic process involved in a VoIP call is as follows: 1. Conversion of the caller?s analogue voice signal into a digital format 2. Compression and translation of the digital signal into discrete Internet Protocol packets 3. Transmission of the packets over the Internet or other IP-based network 4. Reverse translation of packets into an analogue voice signal for the call recipient. The digitization and transmission of the analogue voice as a stream of packets is carried out over a digital data network that can carry data packets using IP and other, related Internet related protocols (see section 2.1). This network may be an organization?s internal LAN, a leased network, the PSTN or the open Internet (Gradwell, 2006). The compression process is carried out by a codec, a voice-encoding algorithm, which allows the call to be transmitted over the IP network within the network's available bandwidth.
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