Plantronics U10P Cable. With a flexible coiled cord for convenience, the U10P modular adaptor plug allows you to connect any of the H-series headsets manufactured by Plantronics to a phone with a standard RJ9 headset port. It also sports a convenient quick disconnect plug which you can use with compatible amplifiers from Plantronics.. This cable is compatible with any H series Plantronics headset and the following phones:. Avaya: 9330-AV. BT: BT Paragon 650. NEC: SI100 Terminals. Nortel: i2002, i2004 Series, NT DU 92. Polycom: CX300, 500, 600, IP300, IP301, IP335, IP430, IP450, IP500, IP501, IP550, IP560, IP600, IP601, IP650, IP670, SE-220, SE-225, Star2Star IP301, Star2Star IP560, VVX300, VVX310, VVX400, VVX410, VVX500, VVX600, VVX1500. ShoreTel: IP665, IP665G, IP100, IP212K, IP230, IP265, IP530, IP560, IP560G, IP565, IP565g. Snom: 300. Yealink: SIP-3X, SIP-T20P, SIP-T22P, SIP-T26P, SIP-T28P, SIP-T2X, SIP-T32G, SIP-T38G, SIP-T41P, SIP-T42G, SIP-T-46G, SIP-T48G