NEC UNIVERGE SV8100 Features & Specifications Manual page 562

Issue 5.0
To change a handset call into a Handsfree call:
1. Press Speaker and hang up the handset.
2. Press Speaker again to hang up.
To change a Handsfree call into a handset call:
1. Lift the handset.
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UNIVERGE SV8100
Handsfree and Monitor