This paper discusses the telephone network infrastructure commonly known as the Public
Switched Telephone Network (PSTN) and provides insight into fundamental differences between
the "traditional" telecommunications network and the Internet. The Internet has evolved from a
research computer network to a vibrant communication platform, based on competition, regulatory
independence and transparency, and continuous innovation. Today a significant amount of the
world’s voice traffic travels over IP-based networks and the Internet. However, legacy PSTN
regulations cannot be transferred or applied directly to the Internet, as there is little commonality
between it and the PSTN.