sipmon

At a glance

• Editor score
  7.1 / 10
• Pricing
  Open source
• Best for
  Open-source command-line SIP diagnostics
• Paid from
  Free
• MOS scoring
  Yes
• Facts checked
  20 Sep 2026

• Where it wins

  • Live and offline capture analysis with BPF filtering
  • Correlates SIP calls and tracks signaling state
  • Measures jitter, loss, RTT, delay, and estimated MOS

• Where it doesn't

  • Passive monitoring does not provide synthetic call testing
  • Command-line and terminal workflows may not suit GUI-first teams
  • Platform coverage and integrations are not part of its documented scope

Our verdict on sipmon

sipmon is an open-source Rust command-line tool for passive SIP signaling and RTP media-quality monitoring. It is aimed at engineers diagnosing voice traffic from mirrored ports, packet-capture systems, stdin capture streams, offline pcap or pcapng files, and recorded event logs. SIP Call-ID correlation and call-state tracking connect signaling with media analysis, while a terminal monitoring interface presents diagnostics without requiring a running PBX. JSONL export also supports downstream processing of captured results.

Its strongest area is the depth of its passive packet analysis. sipmon supports live interface capture through libpcap and BPF filters, offline capture review, SIP-over-TCP reassembly, TURN relay detection, and RTP and RTCP measurements. The published feature set includes RFC 3550 jitter and packet-loss analysis, RTCP receiver-report RTT measurement, one-way delay estimation, and E-model MOS estimation. Together, these capabilities make it suitable for investigating signaling and media-quality problems from real traffic, especially when packet captures are already part of an operations workflow.

The trade-off is scope: sipmon observes and analyzes captured traffic rather than generating synthetic calls, so it is not a complete active monitoring system. Its command-line and terminal design favors technical users who are comfortable with captures, filters, event logs, and JSONL output. Teams seeking broad platform coverage, integrations, or synthetic testing should choose a product designed around those functions instead. sipmon is a strong fit for open-source, capture-driven SIP diagnostics and a narrower fit for teams that need hosted monitoring or a wider ecosystem.

Your product? Our editors can test sipmon in depth and publish a review, labelled as paid · from $149/mo →

sipmon pricing

sipmon fact sheet

Alternatives to sipmon

• VVoIPmonitorDeep VoIP visibility for teams managing complex, distributed voice environments.9.4
• Telchemy SQmediatorA broad VoIP and video monitoring platform for teams managing complex communications environments.9.1
• CallMeterA focused platform for measuring, testing, and monitoring SIP and VoIP quality.9.0

See all sipmon alternatives →

Featured on iTechGuides

sipmon is listed in our VoIP Monitoring Software directory. Add the badge to your site — it links back to this page.

<a href="https://www.itechguides.com/products/sipmon/"><img src="https://www.itechguides.com/best/badge/sipmon.svg" alt="Featured on iTechGuides" width="230" height="46"></a>

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated 7 Oct 2026 · How we research and update