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STATUS_CTX_MODEM_RESPONSE_NO_DIALTONE
No dial tone was detected
This status is specific to a dial-up modem path. The modem did not detect dial tone within the required interval, so the connection failed before any Remote Desktop protocol negotiation could begin.
The actionable evidence is analog-line and modem configuration. RDP listener, certificates and user rights are unlikely to be the root cause for this status.
What to inspect
- Check the phone cable, PBX/outside-line prefix and modem dial rules.
- Confirm that the modem definition matches the attached hardware.
- Verify that no voice device or fax service is holding the line.
References
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