Back to Phones Siemens Published at: 14-03-2016 11:13 Optiset , optipoint 410 /420 /500 models , Openstage T, HFA, SIP Gigasets SL3, SL4, S4 etc Avaya IP and digital phones 1400, 2400, 4400, 5400, 6400, 9500 , 9600 series Nortel Digital phones M3902 , M3903 , M3904 , M3905 IP phones 1120 E /1140 E/ 1150E , I2000 series and 1200 series Dect phones 4027 / 4070 and more