The right VoIP and SIP monitoring tools make troubleshooting fast and systematic. From packet capture and live SIP trace visualization to call quality dashboards and AI-powered analysis, here are the open-source and commercial tools every VoIP engineer should know — and when to reach for each one.
Most production SIP environments end up running several of these in parallel — each is good at something different. Below is the open-source landscape for VoIP and SIP monitoring, with where SIPSymposium fits as an AI-powered analysis layer on top.
| Tool | Type | Best for | License |
|---|---|---|---|
| sngrep | Live SIP terminal monitor | Real-time troubleshooting on a SIP server | GPLv3 (free) |
| Wireshark | GUI packet analyzer | Offline PCAP analysis, deep protocol inspection | GPLv2 (free) |
| tcpdump | CLI packet capture | Headless capture, scripting, file rotation | BSD (free) |
| Homer / sipcapture | SIP capture and storage platform | Production SIP archive and search at scale | AGPL (free, self-hosted) |
| VoIPmonitor | Call quality and CDR monitor | Continuous MOS scoring, CDR generation | Open core (free + paid) |
| SIPSymposium | AI-powered SIP and PCAP analysis | Interpreting traces without deep SIP expertise | Freemium SaaS |
SIPSymposium is not a replacement for sngrep or Homer — it is the AI analysis layer that interprets the traces those tools capture.
In practice these are layered rather than alternatives. A typical Tier-2 VoIP team runs Homer for the archive, VoIPmonitor for quality dashboards, and reaches for sngrep or Wireshark when investigating a specific incident:
Wireshark is the standard for offline PCAP analysis. For VoIP:
sngrep is a terminal-based SIP capture and display tool. It shows live SIP dialogs with color-coded message flows — the fastest way to see what is happening on a SIP server in real time.
VoIPmonitor captures SIP and RTP, calculates per-call MOS scores, and provides a web dashboard for call quality analysis. It runs as a daemon on your PBX server and provides historical quality data.
Call quality metrics depend on the underlying network. For the QoS marking, queue configuration, and bandwidth allocation that make consistently good MOS scores possible, see our VoIP QoS configuration guide.
Homer is the open source standard for SIP capture and storage at scale. It stores SIP traces in a searchable database and provides a web UI for call flow visualization. Production deployments use Homer for compliance, troubleshooting, and capacity planning.
Homer provides: call search by Call-ID, From, To, or timerange; visual call flow diagrams; PCAP export per call; CDR statistics; and API access for integration with other tools.
| Tool | Focus | Best for |
|---|---|---|
| VIAVI Observer | Network + VoIP quality | Enterprise network monitoring |
| NetScout nGeniusONE | Application performance | Large enterprise, carrier |
| Empirix Hammer | VoIP testing and monitoring | Contact center testing |
| IR Prognosis | UC monitoring | Teams, Cisco, Avaya monitoring |
| Anritsu CQM | Carrier-grade monitoring | Telco, carrier deployments |
Traditional monitoring tools surface metrics but require engineer expertise to interpret them. AI-powered analysis interprets the SIP trace and provides actionable findings directly.
SIPSymposium provides AI-powered SIP trace analysis: paste a SIP trace or upload a PCAP and get expert-level findings — severity-ranked issues, RFC compliance checks, codec analysis, NAT detection, encryption validation, and multi-endpoint correlation — in seconds. Multi-endpoint correlation is especially useful when traffic crosses a B2BUA or SIP proxy that rewrites Call-ID between legs.
Capabilities:
The best tools for SIP trace analysis depend on your use case: sngrep for real-time terminal monitoring on a live server, Wireshark for detailed offline PCAP analysis with call flow visualization, Homer for scalable production SIP capture and storage, and SIPSymposium for AI-powered analysis that interprets findings without requiring deep SIP expertise.
Measure VoIP call quality using RTCP Receiver Reports which contain packet loss fraction, inter-arrival jitter, and round-trip time. In Wireshark: Telephony → RTP → RTP Streams. For production monitoring, deploy VoIPmonitor for automatic per-call MOS scoring. Target MOS above 4.0, packet loss below 1%, and jitter below 30ms.
Homer is an open source SIP capture and storage platform. HEP agents on your SIP servers (Asterisk, Kamailio, FreeSWITCH) send copies of SIP messages to the Homer Capture Server via the HEP protocol. Homer stores them in a database searchable by Call-ID, number, or time range. The web UI shows call flow diagrams and allows PCAP export per call.
Paste your SIP trace or upload a PCAP into SIPSymposium. Get expert-level findings on signaling errors, codec mismatches, RTP quality, and compliance issues in seconds.