Off Premise Extension

Off Premise Extension

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.

An OPX is a conditioned pair usually for voice only. For data, the pair usually needs to be unconditioned. An alarm circuit is an unconditioned pair.

OPXs are used in distributed environments, serving locations that are too far from the PBX to be served by on-premises wiring.

See also


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