![]() ![]() An acceptable quality call meets the QoS recommendation if its latency in VoIP is less than 400 ms, its jitter less than 30 ms and its packet loss less than 5%. ![]() This research focuses on three QoS features, namely latency, jitter and packet loss. In this paper, Quality of Service of VoIP on an existing anonymous system - The Onion Router (TOR) is investigated. due to the unpredictability of network connections and routes in the existing anonymous systems, adopting security and privacy in VoIP network reduces the Quality of Service (QoS). It is possible to monitor data packets from any location connected to the Internet network hence, it is necessary to consider security and privacy when implementing a VoIP system. Unlike PSTN, VoIP transfers data packets over the open network the Internet. Currently, Voice over Internet Protocol (VoIP) is replacing traditional telephone systems Public Switched Telephone Network (PSTN).
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