Access Control List
A Direct Station Selection (DSS) key is used on a phone or sidecar to allow monitoring and/or direct dialing of an extension. These keys can also often be programmed as one touch dials for external numbers as well. Sometimes they are referred to as Busy Lamp Field (BLF) keys.
An F-A-Q (or pronounced) "fak" is used to indicate both a single frequently asked question as well as a list of such questions. Some people pluralize the work pronouncing "FAQs" like "fax".
Session Border Controller