# Clear code values

The following table lists the valid clear code values for ACU_CLEAR_CO and ACU_CLEAR_IN messages.

These values are defined in isdnacu.h.

Clear code | Description
--- | ---
ACURC_BUSY | Busy.
ACURC_NOPROCEED | No proceed indication (dial tone).
ACURC_NOANSWER | No answer.
ACURC_NOAUTOANSWER | No auto-answer tone detected.
ACURC_CONGESTED | GSTN or system is congested.
ACURC_INCOMING | Incoming call detected while trying to dial.
ACURC_NOLINE | Wrong addressing information or context already used.
ACURC_ERRNUM | Errored number.
ACURC_INHNUM | Inhibited number.
ACURC_2MNUM | Too many errored or inhibited numbers.
ACURC_HUNGUP | Remote has hung up or incident on connection.
ACURC_NETWORK_ERROR | Network has disconnected.
ACURC_TIMEOUT | Timeout error.
ACURC_BAD_SERVICE | Bad service ID in ACU_CONN_RQ/RS.
ACURC_INTERNAL | Other internal error.