1. Citations are used sparingly, most information is not verifiable.
2. Sections of the article are not encyclopedic content. "Number plan trivia" includes unnessesary information on numbering plans not directly related to telephone exchanges. This section needs to be more concise, or moved to a new article on numbering plans.
3. The article neglects major facts and details, see 1(b). As referenced in the talk page, the article does not address several major functions of a central office. Information pertaining to central offices is not current.
4. Prose is inconsistent and does not meet wikipedia standards in some sections.
And I know noticed the presence of some stubby sections ("Electronic switches") and the prose problems (many one-sentence paragraphs, which indicate an incoherent writing).--Yannismarou14:13, 19 September 2006 (UTC)[reply]