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'Free Up' your Internet Connection
Given
limited data capacity of dial-up connections, it's important that you devote as much of your bandwidth as possible to
VoIP softphone application. To achieve maximum call quality, don't do anything that uses your bandwidth whilst making calls. This includes instant messaging, checking email, using a webcam, browsing
internet, downloading, etc. In Windows, you can look at
two little computers in
bottom right of your taskbar to see whether your connection is being used prior to calling (the little computers illuminate when data is being uploaded and/or downloaded).
Scan your System for Viruses, Spyware, Adware and Malware
Some of these malicious programs can hijack your browser, tie up your internet connection and slow down your system (not to mention seriously invade your privacy!). I recommend AdAware for free scanning and removal of Spyware/Adware. Once you've checked and cleansed your system of these nasty programs, your virus definition files should be updated to minimize
chances of re-infection.
Use a Headset with an Integrated Boom Microphone
Last but not least, using a headset with a boom microphone should eliminate those annoying voice echoes often associated with PC to phone calls. Echoes are caused by your microphone detecting
voice coming from your computer speakers and re-transmitting that voice signal back to
person you're talking to. By using a headset,
voice signals are limited in volume (due to
headset being directly adjacent to your ears) and thus
chances of your microphone 're-transmitting' those voice signals is greatly reduced.
So there you have it. A lack of high speed Internet needn't mean a lack of PC to phone VoIP capability.

Nathan is the owner of http://www.netphonedirectory.com which deals specifically with PC to Phone and PC to PC VoIP. The site includes a comprehensive directory of PC to Phone service providers as well as general information on VoIP and what you need to make inexpensive long-distance telephone calls using your computer