"Third, any existing uses of non-standardized “Service Descriptions” in the Customer Name/Service field SHOULD promptly be reviewed and cease to be used thereafter to the extent not inconsistent with the new seven standardized “Service Descriptions” in Section 20, and that “Service Descriptions” will only be added as a result of future changes to this document and Section 20." is directing a data provider e.g. a OSP, what to do. That is currently and historically out of bounds for NENA.
Also, the use of a double negative "not inconsistent" is unnecesssary and confusing.