# Progress description values

The following table lists the valid progress description values for ACU_ALERT_IN, ACU_ALERT_RQ, ACU_CALL_PROC_IN, ACU_CALL_PROC_RQ, ACU_CLEAR_IN, ACU_CONN_IN, ACU_CONN_RQ, ACU_PROGRESS_IN, ACU_PROGRESS_RQ, and ACU_SETUP_REPORT_IN messages.

These values are defined in isdnval.h.

Progress description | Description
--- | ---
NO_PROGRESS_DESCR | No progress information to be stored.
PROGRESS_DESCR_NON_END_TO_END_ISDN | Call is not end-to-end ISDN; further call progress information may be available.
PROGRESS_DESCR_CALL_RETURNED_ISDN | Call has returned to the ISDN.
PROGRESS_DESCR_IN_BAND_NOW | In-band information or appropriate pattern now available.