ABSTRACT
Centrex (also called Plexar, CentraNet, Centron, Cenpac, Intellipath or Presstige) is a business telephone service offered by your local telephone company from the local central office. Most medium-sized and larger companies use a PBX because it’s much less expensive than connecting an external telephone line to every telephone in the organization. In addition, it’s easier to call someone within a PBX because the number you need to dial is typically just 3 or 4 digits.
