# ACU_SS_AOC_VOLUME constants

These constants specify the volume type in the volume_type field of the tAcuSSAocVolume extended data structure:

Constant | Description/Notes
--- | ---
ACU_SS_AOC_VOLUME_TYPE_OCTET | User-to-user charged on an octet basis.
ACU_SS_AOC_VOLUME_TYPE_SEGMENT | User-to-user charged on a segment basis.
ACU_SS_AOC_VOLUME_TYPE_MESSAGE | User-to-user charged on a per-message basis.