This is the Plantronics RD-1 EHS cable for for remote desk phone call control (answer/end).
It is compatible with the Plantronics Wireless headsets:
Plantronics CS540, CS510, CS520, CS530, Savi WO100, Savi WO200, Savi WO300, Savi WO350 , Savi W740, Savi W710, Savi W720, Savi W730 , Savi W745, Voyager Legend CS, MDA200 USB, MDA220 USB
The EHS cable compatible with the following phone:
Shortel IP 212K, IP 230, IP 265, IP 480, IP 480G, IP 485G, IP 560, IP 560G, IP 565G, IP655
Toshiba IPT 2008-SDL, IPT 2010-SD, IPT 2020-SD, DP 5118-DP, DP 5130-SDL, DP 5X22-SD, DP 5X32-SD
1 Year Warranty
Shortel Setup Guide: http://www.businessmachine.com.hk/userfiles/files/RD-1_Shortel.pdf
Toshiba Setup Guide: http://www.businessmachine.com.hk/userfiles/files/RD-1_Toshiba.pdf