Key Features:
- Mfr. Part #: 87317-01 or HP 85Q57AA
- APC-45 Electronic Hookswitch
- Provides communication between your phone & Plantronics Headset
- Allows user to answer & end call using the headset call control button
- Eliminates the need for a HL10 Lifter
- Compatible with the following Plantronics Headsets: CS520, CS540, Savi WO100, WO200, WO300, WO350, W710, W720, W730, W740 & w745
- Compatible with the following Cisco IP phones: SPA512G, SPA514G, SPA-525G & SPA5252G