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What is the difference between analog phone equipment and an IP phone?

What is the difference between analog telephone equipment directly connected to the FXS port of the router and an IP phone connected on a switch?

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An FXS port supplies ring, voltage and dial tone for basic telephone equipment, keysets and PBX's. An IP phone connected to a switch receives power from some other means. You can learn about energy efficiency in telephone systems from networking expert Carrie Higbie.

 

This was first published in May 2007

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