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What is the difference between VoIP and voice chat used by PCs?

What is the difference between VoIP and voice chat used by PCs?
The biggest difference is that in a softphone (of which I am assuming you are speaking) uses the sound card in a PC to act as the codec for the conversation. In a VoIP phone, this functionality is in the phone. The phone would sample the voice, load it in a packet, etc. Softphones also may use different ports depending on the manufacturer and may or may not support SIP.

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