Advanced Infrastructure Penetration Testing

Denial-of-Service

Denial-of-Service (DoS) is a threat to the availability of a network. This attack was discussed in the previous chapters. DoS could be dangerous too for VoIP, as ensuring the availability of calls is vital in modern organizations. Not only the availability, but also the clearness of calls is a necessity nowadays. To monitor the QoS of VoIP, you can use many tools that are out there; one of them is CiscoWorks QoS Policy Manager 4.1:

To measure the quality of VoIP, there are some scoring systems, such as the Mean Opinion Score (MOS)  or the R-value based on several parameters (jitter, latency, and packet loss). Scores of the ...