The history of telephony begins with the public switched telephone network (PSTN), which is the worldwide circuit-switched telephone network made up of public and private networks. Voice over IP (VoIP) is the latest telephone technology which is able to provide advanced services to both consumers and businesses, at a reduced cost. This course covers the history and operation of the PSTN and VoIP, and compares the two technologies. Basic signaling technologies used in the PSTN are also described. In addition, this course explores the expansion of VoIP in both the immediate future and in the coming years.

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