# UUI protocol discriminator values

The following table lists the valid UUI protocol discriminator values for ACU_ALERT_RQ, ACU_CLEAR_CO, ACU_CLEAR_RQ, ACU_CLEAR_RS, ACU_CONN_CO, ACU_CONN_IN, ACU_CONN_RQ, ACU_CONN_RS, ACU_SETUP_REPORT_IN, ACU_USER_INFO_IN, and ACU_USER_INFO_RQ messages.

These values are defined in isdnval.h.

UUI protocol discriminator | Description
--- | ---
UUI_USER_SPF (default for HKG variant) | User specific coding.
UUI_OSI | OSI.
UUI_X244 | Rec. X.244.
UUI_SYSTEM_MANAGEMENT | Reserved for system management convergence function.
UUI_IA5 (default) | IA5 characters (ASCII).
UUI_V120 | Rec. V.120.
UUI_Q931 | Rec. Q.931.