Off-premises extension

An off-premises extension (OPX), sometimes also known as off-premises station (OPS), is an extension telephone at a location distant from its servicing private branch exchange (PBX). An off-line extension is generally used to provide employees with access to a company phone system while they are out of the office.

单词	Off Premise Extension
释义	Off Premise Extension 英语百科 Off-premises extension An off-premises extension (OPX), sometimes also known as off-premises station (OPS), is an extension telephone at a location distant from its servicing private branch exchange (PBX). An off-line extension is generally used to provide employees with access to a company phone system while they are out of the office.
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Off Premise Extension

Off-premises extension