VoIPmonitor is open source network packet sniffer with commercial frontend for SIP SKINNY MGCP 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 / SKINNY protocol or SIP/RTP/RTCP/T.38/udptl protocols. VoIPmonitor can also decode audio.


  • Saves SIP, SKINNY, MGCP VoIP calls to database or pcap files. It can create WAV from G.711/G.722/G.729/G.723/GSM/iLBC/Speex/Silk/iSac
  • Analyzes packet loss and delay variations and calculates MOS score according to ITU-T G.107 E-model
  • Realtime listen to ongoing calls
  • Advanced web application for filtering CDR and finding worst calls by MOS/Loss/Latencies
  • Rreporting and alerting features
  • Fast SIP RTP packet sniffer - up to 20 000 simultaneous calls on single server.
  • Cluster possibilities

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User Reviews


  • Very good and necessary project!

  • preferred last version.

  • The previous version is much etter!

  • Came across this tool the other day. It's proved invaluable already to me and the team.

    1 user found this review helpful.
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Additional Project Details



Intended Audience

Telecommunications Industry

User Interface


Programming Language

C++, C, PHP

Database Environment