What is PSTN

VoIP is the use of Internet protocols to provide telephone services that have previously been delivered over traditional telephone networks. Advantages of VoIP include cost, portability, and functionality which are the main reasons that many consumers and small businesses are considering this technology as a replacement to traditional telephone services. There are however risks associated with VoIP services which impact quality and security of the phone system for voice communications. This chapter reviews issues related to quality and security as faced by consumers and small businesses. Recommendations are provided to improve call quality and mitigate threats faced in the VoIP environment.