... Noise Cancelling Direct with RJ11 plug corded headset FOR600 Headset Key Features:1. Acoustic shock protection circuit2. ... as T100 Headset BRAND NEW IN BOX CallTel T200 Polaris headsets require no amplifier! They plug directly into your headset-ready ... 600 Office OpenStage 40, 40TDM, 60, 60TDM, 80, 80TDM Phones ROLM Phones with EHO option Module 612, 624 SNOM Technology: 300 Spring ...