Back to Phone Systems (PBX) Siemens systems Published at: 14-03-2016 11:43 Hicom 150 / 300 Hipath series HP 3350 / 3550 / 3750 / 3800 / 4000 Nortel BCM, Norstar, Meridian ( Option 11c , 61c , 81 c ) CS 1000 and CS 2000 Passport Nortel Optera Avaya IP400 IP500 Definity Media Gateway Media Server