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VoIP has many advantages compared to PSTN; primarily the number one advantage is that VoIP is considerably less expensive than other networks. Many Instant Messaging programs are now incorporating the technology of VoIP and are providing free calls anywhere in the world. The only requirement is that the other user has a computer, high speed Internet, speakers, a microphone, and the same Instant Messaging program. These Instant Messaging programs have many advantages. The first advantage is that they are absolutely free.
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