After the user has connected the magicJack® dongle for the first time, registered the device, and has the 'softphone' on the screen, the user should probably run TCP Optimizer to “tune” the computer to work with it in an efficient manner; it can be downloaded from the following website:
http://www.speedguide.net/downloads.php
The program can aid both the novice and the advanced user in tweaking related TCP/IP parameters in the Windows Registry, making it easy to tune your system to the type of Internet connection used. The tool uses advanced algorithms, and the bandwidth delay product to find the best TCP Window for your specific connection speed. It provides for easy tuning of all related TCP/IP parameters, such as MTU, RWIN, and even advanced ones like QoS and ToS/Diffserv prioritization. The program works with all current versions of Windows, and includes additional tools, such as testing average latency over multiple hosts, and finding the largest possible packet size (MTU).
The user can use the TCP Optimizer by following these short instructions:
1. Choose the maximum Connection Speed from the slider bar (the maximum available bandwidth, in kilobits per second)
2. Choose the Network Interface, or check to Modify All Network Adapters
3. Pick "Optimal settings" from the radio-buttons near the bottom of the program
4. Click on the "Apply changes" button and reboot