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What is the difference between "Internet Telephony" and "IP Telephony"?

What is the difference between "Internet Telephony" and "IP Telephony"?
People often use the two terms interchangeably. IP telephony is a more general term. It indicates that telephony features and functions are provided over an IP network. This network can be a public network, such as the Internet, or a private network. Internet Telephony indicates that telephony features and functions are provided over the public Internet.
This was first published in July 2004

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