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VoIP ( Voice over Internet Prptocol) system is a Packet Switched System, comparing with Circuit Switched System, VoIP doesn’t have a dedicated circuit for the call you made, and the QOS ( Quality of Service) is a very important issue, there are various factors affect the quality of VoIP Calls, the most important factors are: * Delay : Delay causes two problems: echo and talker overlap. Echo is caused by the signal reflections of the speaker's voice from the far-end telephone equipment back into the speaker's ear. Echo becomes a significant problem when the round-trip delay becomes greater than 50 milliseconds. * Packet Loss : VoIP packet loss takes place when a large amount of traffic hits the network and causes it to drop packets. Packet loss should never exceed 1% and most service providers guarantee service levels with .5% or less packet loss. * Jitter : jitter is the variation of packet interarrival time. Jitter is one issue that exists only in packet-based networks. While in a packet voice environment, the sender is expected to reliably transmit voice packets at a regular interval (for example, send one frame every 20 ms). These voice packets can be delayed throughout the packet network and not arrive at that same regular interval at the receiving station (for example, they might not be received every 20 ms. The difference between when the packet is expected and when it is actually received is jitter. * Echo : echo is caused by the far-end point. The loudness of the echo on VoIP calls is no worse than PSTN calls. The difference is that because of the inherent delay induced by VoIP, echo is much more noticeable. There are many methods to compensate Packet Loss, Jitter and Echo cancellation. testyourvoip.com provides a tool to test your VoIP quality. With a Java applet on your PC makes a call using the SIP call-signaling protocol to one of these Verifiers. The Verifier answers the call and then measures the quality of the "conversation." And assembles all of the test results and provides you with the nifty graphs and tables you see when your test is completed. [ What Is A VoIP Phone? ] In spite of the growing popularity of IP telephony, there are still many people who do not know what a VoIP phone is. What is the difference between a VoIP phone and an ordinary phone? [ Cut Your Business Overhead With VoIP ] Business expenses play a significant role in impacting company profits and keeping these costs in line is crucial to the long term success of any venture. With fuel prices rising, interest rates surging, and salaries escalating, many business managers are finding it increasingly difficult to contain costs without resorting to implementing higher prices for products and services. However, the new global economy warrants that businesses do everything in their power to hold prices in line otherwise an overseas competitor could quickly step in and offer the same service for less. So, just how can managers remain competitive against such difficulties? By replacing their traditional corporate phone system with a VoIP driven PBX system. Let’s examine how this new way of communicating is positively impacting the bottom line of companies across America. Traditionally, company phone systems have been a costly, but necessary way for employees to keep in touch with each other as well as with their customers. These Private Branch eXchange or PBX phone systems were originally credited with helping to lower overhead costs for companies as they eliminated the need for separate phone lines for every employee at every location. Yet, costs for maintaining these systems have remained a significant part of the cost of doing business for small and medium sized businesses. Until recently, businesses had no choice to help them reduce telephone related expenses: Enter Business VoIP. Much like the internet telephony systems available to consumers in their homes, business VoIP services are springing up to serve small and medium sized businesses everywhere. Just like home phone connections, business VoIP calls are routed through internet wiring for a much cheaper alternative than the traditional phone system. Indeed, yearly cost savings averaging 50% are being realized by companies who have made the switch over to business VoIP. With Business VoIP, providers have taken the traditional PBX systems and updated them for the 21st century. Gone is the need for a receptionist to screen and redirect calls, the VoIP PBX system can be set up to do that for you. Calls can be rerouted to different offices, to cell phones, to locations far a field. Furthermore, certain “extras” that could significantly add to the cost of monthly phone expenses are routinely incorporated into various Business VoIP packages including: call waiting, caller identification, three way calling, conference calling, and more. Important options such as voice mail forwarding to email account, typically not offered with traditional PBX systems, are one of several popular features of business internet telephony systems. A user friendly panel allows for easy web portal management permitting the Business VoIP manager [typically, an existing employee] to monitor the system and make changes quickly and efficiently. In addition to the substantial month to month savings realized by Business VoIP users, start up costs for a VoIP PBX system are as much as 90% lower than traditional PBX systems. This “lower cost of entry” combined with the significantly lower monthly usage expense is behind the current boom in internet telephony for small and medium sized businesses. Truly, a greater number of businesses across America will be giving serious attention to what business VoIP PBX systems have to offer for them. Combining very low start up costs with demonstrably lower administrative expenditures will certainly continue to fuel the rapid rise in interest for select VOIP PBX providers. In these days of rapidly rising costs, internet telephony is a welcome and necessary cost saving alternative for small and medium sized businesses everywhere and certainly will help users remain competitive in the global marketplace.
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