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Go to this link. It discusses VoIP which is a type of telephone which doesnt charge as it uses the protcols from the internet.
http://en.wikipedia.org/wiki/VoIP
Answer
There are analog and digital telephones (IP phones) used in the communication industry. To make analog phone compatible to IP service an Analog adapter in needed in order for the voice signal to run over the internet connection.
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∙ 13y ago
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