VoIP and IP Telephony: Planning for Convergence in State Government

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.