Plantronics - Electronic Hook Switch Cable APP-51 (Poly) - Remote Desk Phone Call Control - Works with Poly Desk Phones
Electronic hook switch cable is designed for remote desk phone call control (answer/end). This cable eliminates the need for a HL10 handset lifter. Only compatible with Polycom SoundPoint IP 320/321, SoundPoint IP 330/331, SoundPoint IP 430, SoundPoint IP 550, SoundPoint IP 560, SoundPoint IP 650, SoundPoint IP 670, VVX 1500 and VVX 400.