NEC Electra Elite 48/192 Features And Specifications Manual page 503

Issue 6
R - 18
Use Memory Block 4-41 (SIE/CAR Ringing Line Preference
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Selection) to specify whether to allow (default: YS) or deny (NO)
Ringing Line Preference (go off-hook or press Speaker key) on all
telephones that are assigned SIE and/or CAR keys.
General:
Ringing Line Preference picks up lines that are programmed to ring
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at that station only.
For multiple calls in one of the following priority levels, the Multiline
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Terminal answers the line that was ringing first:
1. Voice Announcement or internal ringing call.
2. Ring transfer calls to a station.
3. Ringing call on an outside line key.
When the user sets Ringing Line Preference, the red Answer key
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LED is on at their station.
Ringing Line Preference has priority over Prime Line and Hot Line
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Assignment.
The CO line that begins ringing first is answered first.
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All stations are assigned this feature at default.
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Electra Elite
Ringing Line Preference