Amazon.com: Polycom Compatible Plantronics VoIP Ultra Noise Canceling Hw720 Duo Headset Bundle | SoundPoint, VVX and CX Phones: IP300, IP500, IP600, CX200, CX700 : Electronics
NEC compatible Plantronics Encore PRO Duo Wideband Headset, HW301N (HW720) | NEC - Direct Connect headset| Compatible with office phones, VoIP | iLV(XD)Z-Y(BK), dLV(XD)Z-Y(BK), dt700, dt300,
Poly EncorePro HW720 Binaural Headset 78714-101 B&H Photo Video