Add the GN 1000 Remote Handset Lifter to your GN Netcom wireless headset system, and you’re completely free to roam in
the office. With the GN 1000, you can answer calls, and end them, from wherever your wireless headset takes you.

Answers and ends calls remotely by lifting and lowering handset
Eliminates telephone compatibility questions by
working with most standard telephones
Provides reliable operation thanks to its magnetic sensor technology
Is easy to install
Never misses a call
Sets up quickly and easily
Lets others know when you’re on a call with its online indicator
Doesn’t add to desktop clutter thanks to its near zero footprint

Further details:
GN Jabra GN100 Handset Lifter (PDF)