On Mon, May 10, 2010 at 1:09 PM, Martin Vít <[email protected]> wrote: > On 8.5.2010 00:40, Jeff Brower wrote: > > Martin- > > > > > >> checkout new open source voipmonitor.org SIP packet sniffer. I've > >> developed it for my telco company and I've decided to share it. > >> Testing and contributions are welcome! > >> > >> VoIPmonitor is open source live network packet sniffer which analyze > >> SIP and RTP protocol. It can run as daemon or analyzes already > >> captured pcap files. For each detected VoIP call voipmonitor > >> calculates statistics about loss, burstiness, latency and predicts MOS > >> (Meaning Opinion Score) according to ITU-T G.107 E-model. These > >> statistics are saved to MySQL database and each call is saved as pcap > >> dump. Web PHP application (it is not part of open source sniffer) > >> filters data from database and graphs latency and loss distribution. > >> Voipmonitor also detects improperly terminated calls when BYE or OK > >> was not seen. To accuratly transform latency to loss packets, > >> voipmonitor simulates fixed and adaptive jitterbuffer. > >> > > How many channels can it handle simultaneously? > > I've not tested limits but capturing 15 voip calls takes 3-4% on Core2 > 2.40GHz. Complexity in worst case is O(N^2) where N is number of calls. > Packets are matched as llinear list of IP and port. If this will be > limit, it could be rewriten to hash table O(N) > > > How does it do MOS prediction if low bitrate codecs are being used > > (G729, AMR, etc)? > > > > It is calibrated only to G.711 with PLC for now but I'm planing adding > equations for G.729 and iLBC. > when are you expecting to release
Ram
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