This VoIP test measures the quality of the network connection for by simulating a VoIP call using the G.711 (64 Kbps) codec. A SIP ALG firewall test is also performed. The VoIP test supports simulation of voice traffic for any number of lines, along with most popular codec setting and custom payloads. The ability to customize the VoIP traffic to fit with a particular VoIP provider environment facilitates pre-qualification of networks for VoIP deployments, and identification of cause of poor VoIP call quality.