e/Off Premise Extension

Information
has gloss	eng: Off Premise Extension (often known by the acronym OPX, sometimes as Off Premise Station or OPS) is an extension telephone that terminates in a location distant from its parent PBX. OPX is generally used to provide employees with access to their company's phone system while out of the office.
lexicalization	eng: Off Premise Extension
instance of	c/Communication circuits