Wi-Fi client devices can seek a wireless network to connect to through active or passive scanning for ‘beacons’ broadcast by access points. Smartphones typically use active scanning, which means they switch on their wireless radio for a brief period to send a probe request and receive information about networks within range. The operating systems of wireless devices can include a preferred network list (PNL), which incorporates some of the SSIDs of Wi-Fi networks the device has previously successfully connected to, and some devices will include this information in their probe requests.
Tag Archives: network sniffers
VoIPmonitor
VoIPmonitor is open source network packet sniffer with commercial frontend for SIP RTP and RTCP VoIP protocols running on linux. VoIPmonitor is designed to analyze quality of VoIP call based on network parameters – delay variation and packet loss according to ITU-T G.107 E-model which predicts quality on MOS scale. Calls with all relevant statistics are saved to MySQL or ODBC database. Optionally each call can be saved to pcap file with either only SIP protocol or SIP/RTP/RTCP/T.38/udptl protocols. VoIPmonitor can also decode speech and play it over the commercial WEB GUI or save it to disk as WAV. Supported codecs are G.711 alaw/ulaw and commercial plugins supports G.722 G.729a G.723 iLBC Speex GSM Silk iSAC. VoIPmonitor is also able to convert T.38 FAX to PDF.
via VoIPmonitor – VoIP monitoring software – quality analyzer – WAV recorder.