ERROR_CTX_MODEM_RESPONSE_BUSY - 7015 (0x1B67)
Busy signal detected at remote site on callback.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_CTX_MODEM_RESPONSE_BUSY error code, with the numeric value 7015 and hexadecimal representation 0x1B67, indicates that a busy signal was detected at the remote site during a modem callback operation. This error is typically encountered in scenarios where a communication attempt to a remote device or service has been interrupted due to the remote party being engaged.
Error Details
This specific error code is part of the Windows API and is used to convey that a busy signal was received from the modem during an attempted connection or callback. The presence of this error suggests that the remote site is currently occupied, preventing further communication at that moment.
Usage Context
The ERROR_CTX_MODEM_RESPONSE_BUSY error code is relevant in contexts where modem-based communication and callback operations are performed. This includes scenarios such as dial-up networking, modem-based file transfers, or any application that relies on modem functionality for establishing connections with remote devices.
Developer Interpretation
Developers should interpret this error as an indication that the remote site is currently busy and unable to accept further communication at the moment of the callback. This error does not provide specific details about the reason for the busy signal but indicates that the connection attempt was unsuccessful due to the remote party's unavailability.
Related Errors
ERROR_CTX_MODEM_RESPONSE_NO_CARRIER(7014, 0x1B66): Indicates no carrier signal detected at the remote site.ERROR_CTX_MODEM_RESPONSE_NO_DIALTONE(7013, 0x1B65): Indicates a dial tone was not detected during the connection attempt.
FAQ
Q: What does the ERROR_CTX_MODEM_RESPONSE_BUSY error mean?
A: It indicates that a busy signal was received from the remote site during a modem callback operation, suggesting that the remote party is currently engaged and unable to accept further communication at that moment.
Q: How can I handle this error in my application?
A: You should design your application to retry the connection or callback operation after a suitable delay. Ensure that any necessary state is preserved during retries to avoid data loss or corruption.
Summary
The ERROR_CTX_MODEM_RESPONSE_BUSY error code, 7015 (0x1B67), signifies that a busy signal was detected at the remote site during a modem callback operation. This error is specific to scenarios involving modem-based communication and should be interpreted as an indication of the remote party's unavailability for further communication.
This error does not provide detailed information about the reason for the busy signal but serves as a clear indicator that the connection attempt was unsuccessful due to the remote site being engaged.