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VoIP stands for Voice Over Internet Protocol and is the process of placing a voice call over the Internet using Internet Protocol (IP) Packets. Packets are bits of data that are passed cheap air max dynasty , or routed, from node to node, until they are received by the final digital device (node). The final Node then turns the packet of information back into an analog voice stream that can be heard over a regular telephone.


While both types of phone service, VoIP and Plain Old Telephone Service (POTS) cheap air max deluxe , rely on switching the telephone call through the quickest connection. The POTS telephone call creates a static, dedicated connection, traveling over the same exact route in both directions. This connection stays open until the callers break the connection. The packet switched phone call over the VoIP system actually contains the complete destination address of where it is going, and each packet can take different routes and different amounts of time to reach their destination.


To make a VoIP telephone call cheap air max classic bw , the user has to have two things, a high-speed Internet connection (256kbs or higher) and a broadband telephone adapter. The telephone adapter plugs into the users existing system, either directly into the modem, or into a router. Many of the new broadband phone adapters have a router built into them cheap air max axis , so that the user just plugs it directly into their high-speed modem and they can then plug their computer or router into the broadband phone adapter.


In most situations, it is best to have the router built into the broadband phone adaptor, so that if the user is making a telephone call and on the computer at the same time, the router knows to give most of the bandwidth to the phone call cheap air max 96 , thereby reduce lag time and the frequency of dropped calls. While the new VoIP phone systems are a hundred times better that the ones seen just two or three years ago, they can still drop calls when confronted with a slowdown in the network between the caller and the person receiving the call.


So, while the new VoIP can save the average user a lot of money, VoIP telephone service is still only practical for home and small business users cheap air max 93 , since the stability isn't there that is required by large business ventures. Anyone who is thinking of switching to VoIP should remember that anytime their Internet service goes down, so does their phone service.


For more information on VoIP phone service is available at and see a complete list of VoIP Phone companies and what they charge for service in the United States, visit Introduction
System developing is a matter of interest because it affects many operations of a company. Developing the best system that will be efficient for the operations depends on the methodologies used. A methodology is a framework that helps in structuring, planning cheap air max 360 , and control process of software development. A team of developers has compelling views on the best methodology to use. Among the many that exist, there are two main ones. They are the agile and waterfall methods. The methods are different, but they produce similar results depending on the needs of the developers.
Waterfall methodology
A waterfall methodology is a system development methodology that has product鈥檚 lifecycle phases take place in a sequence. The order of progress flows steadily from the top through the phases like a waterfall. Waterfall is not an invention of anyone. It is an inheritance by developers from other industries, particularly where a stage of production is complete; it becomes expensive to go back and make any changes. It is worth noting that this methodology is a primitive cheap air max 2 uptempo , but the drawbacks have been rectified by forming other models of development (Davis, 2012)
Agile methodology
Agile development methodology draws a linear sequential approach incrementally. Agile development model allows the developers to change requirements over time. This allowance for change prevents extensive planning and design upfront. The model came as a solution to the disadvantages that waterfall method has. Developers start with simple project design and work on small modules. The modules receive operation on timely basis such as weekly or monthly (Shore, 2008)
Agile vs. Waterfall methodology
Fujita & Marik (2009) point out that agile has a backward scalability. Backward scalability means that decisions and implementations made before can quickly change. Under the waterfall approach, it is hard to make any corrections. Conclusions and applications remain binding. If there is a change that is needed cheap air max 180 , the system will need to be built from scratch
Roeback (2011) shows that agile has flexibility to error check under any phase of development. This feature makes agile more free of errors and erroneous. Waterfall is different in that, it is not possible to test for errors and bugs during development phases. Errors and bugs can only undergo a test at the end of each development module.
We have seen that Agile is flexible enough to allow changes and modifications as per the client鈥檚 needs. It is, therefore, more inclined towards satisfying the needs of the customers. Waterfall is rigid. It does not allow any modifications and changes before completion of modules in each phase. This feature is a real set back to the developers since it has no inclination towards satisfying needs of the clients
Modular partitioning of the software can be efficiently carried out under agile development model. Although both development models allow segregation cheap air max 120 , waterfall development model cannot be modified at the implementation stage. It sets out rules before the project takes off. It prohibits more breakdown of the logical module.


Conclusion
Both methods have their strengths and weaknesses choice about which is right for one should come down to the context of the project. Such questions as to whether it is going to be changing rapidly should be in the mi. Cheap Jerseys Free Shipping Cheap Jerseys Online Cheap NBA Jerseys Cheap Authentic Jerseys Cheap Soccer Jerseys China Cheap NHL Jerseys China Cheap Authentic Jerseys Cheap NFL Jerseys China Online Cheap NCAA Jerseys Wholesale Cheap Jerseys China Free Shipping