NEC UNIVERGE SV8100 Features & Specifications Manual page 480

Issue 5.0
To use the Feature Key plus Recall key from a Multiline Terminal with a CO/PBX call in progress:
1. Press Feature.
2. Press Recall.
Receive the new CO/PBX dial tone.
.
3. Dial the desired number.
To use the Drop key feature from a single line telephone with a CO/PBX call in progress:
1. Hookflash.
2. Receive internal dial tone.
3. Dial the Service Code (Program 11-12-59, Default Not Assigned).
4. Receive the new CO/PBX dial tone.
5. Dial the desired number.
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UNIVERGE SV8100
Drop Key