VoIPmonitor 2026.03.1 – "Graph is not available" and "missing calldate" despite spool data present

[vishnuvs369]

Description:
We are facing an issue where VoIPmonitor GUI does not display RTP graphs for calls, even though spool data is present and actively being written.

Environment:
VoIPmonitor version: 2026.03.1
Deployment: Distributed (remote sniffers → central server)
Central server handles:
Database
Spool
GUI
OS: Linux (Ubuntu/Debian)
VoIPmonitor service runs as: root
Web server (Apache) runs as: www-data

Configuration:
spooldir = /data/voipmonitor
Remote sniffers use server_destination (packet forwarding)
GUI is configured to use the same spool directory

Observed Behavior:
Calls are visible in GUI with SIP and RTP statistics
However:
RTP graph is missing
GUI shows: "Graph is not available"
Message: "Data not yet written to disk. Try reload again later."
Popup error: "missing calldate"

[voipmonitor-petr]

Hello,

please use the email support@voipmonitor.org for creating support request/ticket or "open ticket" after you login to clients area of voipmonitor.org

confirm that you are using recent version of a sniffer AND gui. (2026.3.1)

• if RTP data/graph not visible in a GUI - please screenshot detail of a CDR -
• are SIP/RTP packets visible in SIP:history in detail of a CDR??

If there are missing only RTP flow charts(not RTCP flow charts?) - and SIP history is visible, is this experienced with every CDR or only for some CDRs? - is there pattern - like CDRs from specific probe only?

You wrote 'spool data is present and actively being written.' - this applies to which subfolders SIP / RTP / Graphs/ or AUDIO.
You should verify - list the files in each tarball of a spoodir for specific DATE/HH/MM of a call start and grep by CALL-ID to verify that SIP, RTP, GRAPH is there for this CDR. (RTCP packets are stored with RTP packets in a spooldir's RTP subfolder)

Attach also complete voipmonitor.conf from server side (compress attachment with zip)

Best Regards,
Petr Halounek