ENUM
SentFax sorting enum
enum SentFaxOrderKeys {CREATED_AT_ASCCREATED_AT_DESCNUMBER_ASCNUMBER_DESCSTATUSSTATUS_ASCSTATUS_DESCCLIENT_LAST_NAME_ASCCLIENT_LAST_NAME_DESCSENDER_LAST_NAME_ASCSENDER_LAST_NAME_DESCUPDATED_AT_ASCUPDATED_AT_DESC}