code: @Override
      public UserPartAvailableMessage createUPA() {
          UserPartAvailableMessage msg = new UserPartAvailableMessageImpl(_UPA_HOLDER.mandatoryCodes,
                  _UPA_HOLDER.mandatoryVariableCodes, _UPA_HOLDER.optionalCodes, _UPA_HOLDER.mandatoryCodeToIndex,
                  _UPA_HOLDER.mandatoryVariableCodeToIndex, _UPA_HOLDER.optionalCodeToIndex);
          return msg;
      }
docs: /*
  (non-Javadoc)
  
  @see org.restcomm.protocols.ss7.isup.ISUPMessageFactory#createUPA()