VoIPSwitch
A Voipswitch or softswitch is a very important device element of any telecommunications network. It connects different IP networks in order to deliver end-to-end communications
In order to make phone calls via the Internet one’s device has to be compatible with Softphone software. In example in order to call from a PDA using VoIP technology one has to install Softphone software, in order for it to work properly, PDA has to have Softphone compatibility.
Lingo (Primus)
Lingo is one of the most affordable U.S. Internet phone services. Lingo offers unlimited local and long distance calls anywhere in the U.S., to Canada, and to Western Europe, plus over 25 calling features
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