... HA option modulesPolycom SoundPoint IP Phone Series, Models 500 (rev. 5 or later), 600General Electric GE Telephone Model 2-9451, 2 ... , S10, S11, S12, S50, T10, T20, T50, T100, T110, SP-04, SP-05, PLX-400, PLX-500 T100 call center headset for ...