http://www.viop-phone-viop.com/voip_directory Encyclopedia article with background information, technical details, and the advantages and disadvantages of VIOP. Thu, 13 Dec 2007 08:27:27 +0000 http://backend.userland.com/rss092 en Although we're presenting some typical numbers here, you should run the numbers using your own particular configuration. The most beneficial comparisons of a VPN occur when compared to a dedicated, line−based network or one that makes extensive use of long distance dial−up lines. If you are already using a shared ... http://www.viop-phone-viop.com/voip_directory/cost-considerations Unfortunately, although there is compatibility testing, there are no consistent performance criteria across the industry. It, therefore, becomes difficult to compare the performance of different vendor offerings. Vendor claims tend to be exaggerated. They will measure their product in the best possible light (for example, maximum−sized packets and data compression ... http://www.viop-phone-viop.com/voip_directory/throughput-comparison VPN specific boxes are the recommended solution for high volume, large networks. Several vendors offer these solutions in both hardware and software incarnations. The general rule is that hardware boxes will outperform software boxes and are theoretically more secure because they are based on proprietary technology that is harder to ... http://www.viop-phone-viop.com/voip_directory/vpn%e2%88%92specific-boxes The very same issues exist here as with routers. One needs to have compatible (preferably the same vendor's) firewalls at each location. Mobile users or telecommuters must have compatible VPN software. Firewalls are always potential bottlenecks, so asking them to perform VPN encryption can adversely affect all other access to ... http://www.viop-phone-viop.com/voip_directory/firewall%e2%88%92based-vpn Several router vendors offer VPN products based on the ability of the router to perform the requisite security functions. If your VPN is relatively small and the traffic volume not too heavy, then you might consider this option as a cost−effective approach If there are individuals (for example, laptops or ... http://www.viop-phone-viop.com/voip_directory/router%e2%88%92based-vpn The layman's version (don't try this at home because it won't work as described here) is that each of us thinks up a couple of prime numbers (the bigger the better). One number we keep for ourselves and the other number we publish on our web site along with the ... http://www.viop-phone-viop.com/voip_directory/public-key-cryptography-rsa There are five ways to create a VPN: Between desktops Between routers Between firewalls Between VPN−specific boxes With integrated boxes Although not normally considered a VPN, one can certainly use desktop PCs to encrypt data and send it across the Internet securely. Additionally, software is available that runs on a desktop capable of creating a VPN ... http://www.viop-phone-viop.com/voip_directory/creating-the-vpn The goal of any network is to support users in a flexible, reliable, secure, and inexpensive manner: Network managers want the network to be flexible. Users want the network to be reliable and secure. Management wants the network to be inexpensive. A balance of these often−competing goals can be achieved, provided a good dialog ... http://www.viop-phone-viop.com/voip_directory/goals Internet−Based VPN the same time. The philosophical point is that a dedicated network will be overbuilt in some areas and underbuilt in others. A shared network offers the hope that we can spread the overall cost out while getting the benefits of a private network. Historically, this accounts for the popularity ... http://www.viop-phone-viop.com/voip_directory/data-virtual-private-networks-vpns Without trying to throw a damper on the voice SDN/VPN, there are some conditions that may cause the end users to balk at its use. Many organizations' telecommunications management typically try to match the needs of the organization without causing undue stress on the user. However, the special dialing procedures ... http://www.viop-phone-viop.com/voip_directory/users-may-not-like-it