Installer URL handoff

ONVIF works but the RTSP URL fails

Sample RTSP Inspector report for a camera that appears in ONVIF discovery but fails when the installer or VMS opens the RTSP media URL.

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What a customer handoff looks like

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Failure boundary Device discovery succeeded outside the app, but RTSP DESCRIBE/SETUP did not reach a usable media session for the selected stream profile.

Raw evidence excerpt ONVIF device visible; RTSP DESCRIBE returns 404/454 or SDP track/control URL mismatch; alternate substream URL succeeds.

Summary

ONVIF discovery proves the device is visible, but it does not prove the selected RTSP path, credentials, stream profile, or media control URL is usable. The failure boundary is the RTSP URL/profile handoff.

Failure boundary

Device discovery succeeded outside the app, but RTSP DESCRIBE/SETUP did not reach a usable media session for the selected stream profile.

Likely cause

The VMS or installer is using a stale RTSP URL, wrong stream profile, missing channel suffix, credential mismatch, or ONVIF-provided path that does not match the camera firmware's current media endpoint.

Confidence

Medium-high

Evidence screenshots

**RTSP transcript catches path errors** The control transcript shows whether the selected URL fails at DESCRIBE, SETUP, authentication, or profile selection.

**Evidence timeline supports handoff** The timeline gives support and field teams a compact sequence to attach to the customer or vendor ticket.

Evidence table

Layer	Finding	Implication
ONVIF handoff	The camera is discoverable, but discovery is not the same as a validated media URL.	Do not replace hardware just because ONVIF and RTSP disagree.
RTSP DESCRIBE	The selected RTSP URL fails or returns SDP that does not describe the expected media profile.	The stream path, channel suffix, profile token, or credentials should be checked before blaming the NVR.
SETUP/control URL	The SDP control path may not resolve correctly for the selected stream.	A VMS can fail even when a browser, ONVIF tool, or vendor utility can see the camera.
Comparison stream	A substream or alternate vendor URL succeeds while the ONVIF-provided URL fails.	The fastest fix is usually URL/profile correction, not network replacement.

Recommended fix

Test the exact RTSP URL handed to the VMS, not only the ONVIF discovery result.
Compare main stream and substream URLs; note which one reaches DESCRIBE and PLAY.
Update the VMS camera profile or vendor URL template when firmware changes RTSP paths.
Attach this report to the support ticket with the failing URL pattern and the working alternate profile.