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Joined: May 2005
Posts: 456
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OP
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Joined: May 2005
Posts: 456 |
OL (overline) stop was used for very early key systems to stop multi-lines (overlines in Bell parlance) form hunting when an answering machine was in use after hours. The customer leased a cable pair from the carrier that controlled the feature and connected a simple rocker/toggle/SPST switch to it, and when the switch was thrown, calls to the main number would busy out when line 1 as in use. It became obsolete after voicemail came into common usage.
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