The keen interest in Voice over Internet Protocol (VoIP) and Internet Protocol (IP) Telephony and its accelerated adoption rate has led to the realization that the long-established Public Switched Telephone Network (PSTN) voice business model will be facing its end of life in the next 10 to 15 years. This report, a product of NASCIO’s Infrastructure Subcommittee, is intended to provide an understanding of the fundamental issues facing organizations as they assess VoIP and IP Telephony. It contains a description of the operation and functionality of the legacy PSTN, an explanation of voice transport over the Internet and IP Telephony, and a discussion of the issues and drivers associated with the migration from the PSTN to converged voice and data networks.
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