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ERROR_CTX_MODEM_RESPONSE_VOICE
Voice detected at remote site on callback.
ERROR_CTX_MODEM_RESPONSE_VOICE is Win32 error 7016 (0x00001B68) and concerns voice detection at a legacy Remote Desktop callback destination.
What to verify
Verify whether the callback number terminates on a compatible data modem rather than a person, voicemail, or voice-only endpoint. Check callback number source, modem response codes, and answering endpoint configuration.
Likely causes
- the configured callback number is wrong.
- the remote modem is not answering in data mode.
- call forwarding redirects to voice service.
- the telephony network classified the answer as voice.
Troubleshooting steps
- Collect callback number source.
- Record modem response codes.
- Correlate answering endpoint configuration with TerminalServices operational logs, session and user-configuration records, device or modem diagnostics, and the caller’s connection trace.
Handling, retry, and recovery
Correct the destination or configure the remote modem for data answer; do not loop retries against a voice endpoint.
Related errors
ERROR_CTX_MODEM_RESPONSE_NO_CARRIER concerns failed modem carrier negotiation; this code indicates that voice was detected instead
Example
A user profile contains a desk-phone number instead of the modem line. Correcting the stored callback number prevents the server from repeatedly calling a voice endpoint.
References
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