| |
| |
|
VOIP Articles |
|
|
|
VoIP - What is the Problem?
In the beginning, when the Internet Protocol was first designed, no one was thinking about the possibilities of sending audio and video. Real time communication was not an issue. Perhaps the greatest single problem is that the Internet Protocol (the IP part of VoIP - Voice over Internet Protocol) wasn't designed to ensure that the packets are delivered in the correct order. When information is transmitted using IP, the data is broken up into information packets, each of which is sent separately. The correct sequence of packets is part of the information in each packet, but nothing specifically exists to make sure that the packets are delivered, and, therefore, received in the proper order. Now this isn't usually a significant issue for web pages, email, etc. Why? Because these aren't real-time applications. Audio and video however, especially live audio and live video are definitely real-time applications. For a real time conversation to work, the packets have to arrive - pretty much in order and also within certain time limits. The first, and one of the major challenges then, is to restructure incoming packets into the correct order and to somehow cope with lost and/or trashed packets. Face it, the internet does not provide a quality of service guarantee. If enough packets are lost, an audio or video stream rapidly turns into a useless mess. While packets can be resent - the standard way lost/trashed packets are dealt with - real time communication means that you just can't wait around forever. After a certain time, it's simply too late to maintain a coherent stream. What we've seen over the last few years is a gradual and now nearly explosive growth in the use of VoIP, and streaming audio and video. The reason is decline of dial-up and the growth of ISDN, DSL, ADSL, cable and other high speed, high bandwidth access modes. Bandwidth is the answer to most of the problems posed by IP. End-to-end high speed links can ensure high quality sound. The sole remaining problem is latency. For most this is not an issue when they have high speed internet access, however, it can become a problem with satellite links or any other system where unusually long distances and many hops are involved. On private networks, there is rarely a problem using VoIP and many companies with internal networks (such as telcos and power companies) use VoIP to communicate within their organizational network structure. However, when the available end-to-end bandwidth is less than 256 Kbps, a good VoIP system will require mechanisms to overcome fragmentation of the data stream. Security is an issue everywhere on the internet and what this means is that VoIP also needs to deal with firewalls and NATs (Network Address Translation). While some systems can do NAT and firewall traversal on their own, others require the use of SBCs (Session Border Controllers) to manage the traversal. One major, though non-technical, challenge to VoIP, comes from traditional telephone service providers who are being by-passed by consumers who love the extremely low (or zero) long-distance charges they can get by using VoIP. Exactly how this works out over the long run will be fascinating to watch. In the meantime, VoIP services are continually being improved and extended. Enjoy them. For more information on VoIP, conference calling, web conferencing and related subjects visit Alta Global Telecom. Find more on wireless and cellular subjects at Alta Global Wireless. For networking and security check Alta Global Net.
MORE RESOURCES:
Google News |
|
|
|
RELATED ARTICLES
VoIP Phone Home? The movie Extra Terrestrial (ET) coined the phrase "phone home" and each year American's look for more cost effective ways to do just that. The past 10 years have seen the development and growing popularity of Voice over Internet Protocol (VoIP) technologies to achieve cost savings over the traditional circuit-switched telephone networks. Why VoIP is not Going to Fail VoIP is an almost constant topic in our daily dose of business and tech-related news. VoIP, or Voice over Internet/IP is really an old technology re-emerging with a new face and marketing spin. What's Your IQ on Basic PC Phone (VoIP) Knowledge Short T/F quiz1. T / F You can save a significant amount of money using VoIP rather than traditional telephone/cell phone calling methods. Voice over Internet Protocal VoIP for Business VoIP consists of 2 major technologies.. Is VoIP Good For The Home? There is no doubt that you have heard about VoIP by now. It's made headlines and is plastered everywhere both in online and TV advertisements. World On IP Community versus Telecoms Monopoly World on IP community versus the TELECOMS' monopoly or a dream of a visionaryWhy VOIP will grow over the usual telephonyWithout qualification, if one had to choose between usual telephone lines or IP telephony for carrying the voice, the first would be a better fit for the needs of voice communications. Also, IP telephony is generally subject to transmission delays. Use your Computer to make Cheap Long-Distance Telephone Calls What is 'VoIP'?Simply put, VoIP refers to the carriage of voice signals over the Internet. PC to Phone VoIP refers to using your 'Internet-connected' computer to make calls to conventional telephones around the world. Why Over 90% of VoIP Services Are Vulnerable to Attack John Ashcroft, Attorney General, in remarks at the High Technology Crime Investigation Association 2004 International Training Conference held on September 13, 2004 stated, "We have seen worms and viruses attack?disrupting basic services?And with the increased use of the Internet and especially peer-to-peer networking, we have seen malicious code spread more quickly and infect more personal computers than ever before. The cost of these worms, viruses, and denial-of-service attacks?reaches into the billions of dollars. What Is VoIP and How Does It Work IntroductionThe way we make phone calls is changing. In fact in many circumstances things have already changed. VoIP: Finally Worth a Look Dear Internet Friends, Hundreds of thousands of consumers collectively save millions of dollars each month by replacing (or supplementing) their traditional telephone service with personal voice over IP (VoIP) telephony. Using IP to transmit voice is not new. Outstanding VoIP Voicemail Features Makes Getting VoIP Voicemail Extremely Convenient There are many types of VoIP (Voice over Internet Protocol) protocols that are employed by the VoIP providers currently providing VoIP calling plans. Luckily for the consumers, the VoIP providers have listened to what functions the consumers want in their Voicemails. Voip - Voice Over IP and Business: Is It For You? VoIP allows users to make phone calls using their high-speed Internet connection. This translates into free, or very low cost long-distance calling. VOIP For Your Business Many companies are now beginning to look into alternatives to high priced telephone systems currently in use. They are realizing that there are huge benefits financially to those switching over to VOIP. VoIP 101: Voice over IP for Beginners For those who have never heard about the potential of VoIP, be prepared to radically change the way you think about your current long-distance calling plan. VoIP (Voice over Internet Protocol) is very simply, a method for taking ordinary analog audio signals and turning them into digital signals that can be sent over the Internet. VOIP Questions and Answers Voice over Internet Protocol, or VoIP, has grown in popularity recently and with that rise in popularity has come a number of common misconceptions and confusion. Global Value Conncet ( http://globalvalueconnect. VoIP - What is the Problem? In the beginning, when the Internet Protocol was first designed, no one was thinking about the possibilities of sending audio and video. Real time communication was not an issue. How to Never Pay a Hotel Phone Bill Again The protocol is increasingly being adopted as the standard means by which computers communicate to facilitate VoIP or Voice Over Internet Protocol. So you can imagine SIP as a common language for new generation operators to speak to connect calls. Take Advantage of Internet Phone Calls (VOIP) Voice Over IP (VOIP) is a relatively new technology. Voice Over IP allows people to leave behind the old and very traditional analogue phone networks and now adapt in favor of the very new and very progressive Internet-based calling system infrastructure. The Dangers of Peer-to-Peer Systems Peer-to-Peer (P2P) systems do not operate on secure lines, thus providing a conduit for hackers to enter a network or computer, access personal and confidential information, as well as deploy viruses or worms. Users of P2P systems are prime targets and/or launching points for malicious hacker attacks simply because it requires downloading and sharing electronic files or programs, not to mention usage on publicly open and interpretable industry standard protocols and industry standard codec. VoIP is Less Taxing than Traditional Telephone Service When it comes to VoIP Broadband Telephone service, there are many benefits. Unlimited local and long distance calling, included features such as CallerID, Call Waiting, Find Me/Follow Me, etc.
|
| home | site map | Voip Friends | Resource Directory |
| © 2006 |
