http://freebies.about.com/cs/faxphone/a/internetcalls.htm
PC to PC calling has its share of drawbacks. The person you are calling not only needs to be online they need to be running the same Internet phone software you are. The sound quality of your call is dependent on your connection speed and the other person's connection speed. If the connection is slow or there is a lot of traffic at just one end it may be impossible to hold a conversation.On the other hand when you use services that allow you to initiate your call from your PC but call standard telephones you are the only one that needs a special setup. Typically your connection will be the only limiting factor since the service provider will be using high speed connections at their end
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