Plantronics Compatibility Guide for Headsets and Telephones  (See  “Using the Compatibility Guide” on page 1) Back 25 Next adapter a Can use the Polaris model of headsets. STC TELECOM. CORP. Solitaire Plus Five M5 SONITROL Sonitel 100 M5 AB1236 M1 Telic T16 M5 XT2730183100 NO SONY ITK300, ITM500, ITM602 NO ITA500,600, 650, 850, 4000 M5 ITD100, 150, 250 “    ITB2, ITB3, ITB5 “    ITM1O “ SOUNDESIGN Telephone 7278 (2 line) M5 Telephone 7255, 7267 “ Telephone 7373, 7444 “ Slimline 7022, 7027 NO Clock/Radio Sets: 7535, 7547 NO SOUTHERN TELECOM SLT100  (1 line) ^a M5 SLT200  (2 line) “ SLT300  (3 line) “ Caller ID ^b M5 Classey 3100 “ a Headset port is standard on these models.   b Headset port is optional. SOUTHWESTERN BELL Freedom Phones Basic Telephones: (1 line) FC7, 8, 9, 10, 151, 155 M5 FC2500, 2505, 2515 “ FI125, FH100 “ Dial in Handset: (1 line) FI175, FR500 NO FC2540, FC2548, FC2550 “ FC2552, FC2556, FC2560 “ Business Sets: (2 line) FT300, 305, 325 M5 FT350, 400, 425, 483 “ Answering Machine Phone: FA460, 1200 (1 line) “ FA1600, FA1625, FA1900 “ FA955 “ FA965, FA1020 NO Feature Telephones: (1 line) FM 500, 500X, 550 M5 FM825, 850, 875, 1550 “ FM2555, 3500, 3550 “ FD8000, FD8100 (2 line) “ Business System: FT383 “ FT412 (4 line “ 246 Key System: FS800, FS900, FS9000 “ 2465B Key System: FS900B Attendant Console “ Concord AV8, AV32    Concord 10, 16 “ SOUTHWESTERN BELL TELECOM Matrix System Matrix Set: 24TDX, 36TDX M1 Focus Hybrid 20, 50, 100 Focus Sets “ STANTEL SDX 60/180 Proprietary Sets: FT-1, -2, -3, -4 M5 Attendant Console: Proprietary Set w/DSS “ Coronet Coronet Sets: SS, HFS “ SPECTRA MERCHANDISING    DP-7 M5    FP13M, FP23M, FP40M NO    TP9 “    TL4-C, TL12 (Trimline) “