Look at the old mandates that require the firms we used to call telephone companies to maintain their copper-wire phone lines and voice-call switching infrastructure.

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Consumers are also switching to Voice-over-Internet Protocol (VoIP), which after years of talk is so tested and proven that even you've begun to grudgingly sell it.

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At the carrier switching office, the voice is separated from the data and converted back to regular circuit-switched voice.

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