SBC Manager — Diagnostics and Packet Capture
The Diagnostics section provides browser-based packet capture and a support bundle generator.
Packet Capture
Go to Diagnostics → Packet Capture to start a live capture:
| Field | Description |
|---|---|
| Interface | The network adapter to capture on |
| Filter | Traffic filter expression (e.g., port 5060 for SIP only) |
| Duration | Maximum capture length in seconds |
Once the capture completes, a protocol summary is displayed inline and the .pcap file can be downloaded for analysis in Wireshark or any compatible tool.
If a capture shows no traffic:
- Verify the correct interface is selected — SIP traffic is typically on the SIP IP interface, not the management interface
- Confirm the filter expression is correct (e.g.,
udp port 5060for standard SIP) - Verify SIP traffic is actually reaching the server (check Settings → Firewall allowlists)
Command-Line Capture (advanced)
For captures beyond the GUI's bounded duration, root shell access can run tcpdump directly:
tcpdump -i <sip-interface> -w /tmp/sbc-trace.pcap port 5060 or portrange 10000-20000
Download the resulting file and open it in Wireshark (its VoIP → Calls analysis reconstructs the SIP ladder and can play back RTP audio).
Diagnostic Bundle
Go to Diagnostics → Download Bundle to generate a sanitized bundle of captures, logs, and a config summary. Send this bundle to support@siplive.net to assist with troubleshooting.
Route Simulator
For call-routing questions specifically, use Routes → Simulate instead of a packet capture — it shows the winning policy, selected trunk, and applied transforms without placing a call.