# Call blocking events

Event | Informational/ Transitional | Solicited/ Unsolicited | Indicates that...
--- | --- | --- | ---
NCCEVN_BLOCK_FAILED | Informational | Solicited | A request to block calls on a line failed.
NCCEVN_CALLS_BLOCKED | Transitional | Solicited | The application blocked all calls on a line.
NCCEVN_CALLS_UNBLOCKED | Transitional | Solicited | The line is no longer blocked.
NCCEVN_UNBLOCK_FAILED | Informational | Solicited | A request to unblock a line failed.