A telephone in a remote location that is treated as an ordinary extension phone. Before IP telephony was developed, off-premise extensions (OPXs) were handled by forcing the PBX to complete an outbound circuit in addition to the inbound one.
"off-premise extension." YourDictionary, n.d. Web. 09 November 2018. <https://www.yourdictionary.com/off-premise-extension>.
off-premise extension. (n.d.). Retrieved November 09th, 2018, from https://www.yourdictionary.com/off-premise-extension
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