The following abap code shows you how to retrieve the fixed values from a SAP domain. These are the values actually entered into the domain when creating it rather than having a value table assigned to it.
data: it_dd07t type STANDARD TABLE OF dd07t, wa_dd07t like line of it_dd07t. SELECT * "ddtext = text value, domvalue_l = code value FROM dd07t INTO table it_dd07t WHERE domname EQ 'ZDOMAIN' AND "replace with name of your domain ddlanguage EQ sy-langu.