Executone Encore CX (EXC) Series Systems (1832, 3672, 36112)
Ericsson MD100 Systems
Fujitsu Systems (9600, Series 3, Starlog)
Harris Systems (20/20, Intellicom 500, Intellicom 2000)
Hitachi Systems (HCX 5000, FX152D)
Inter-Tel Systems (GMX)
Isotech Sytems (IDS 108, IDS 228, System 96)
ITT/Cortelco Systems (Millenium, System 3100,ECS 6.3, ECS 4.02P)
Lucent (AT&T / Avaya) Systems (Definity G3, Definity Pro Logic, Definity Generic 2, Merlin II, Merlin Legend, Partner ACS, Partner Plus, System 25, System 75, System 85)
Mitel Systems (SX-200 Lite, SX-200D)
NEC Systems (Electra Pro Level I, Electra Pro Level II, Mark II, NEAX 1400 IMS, NEAS 2000, NEAX 2400)
Nitsuko Systems (DS-1, Onyx, 124i, 384i)
Nortel Systems (Meridial 1, Calista, Norstar)
Panasonic Systems (KX-T336, 1232-11D, DBS, KX-TD1232)
Premier Systems (ESP)
Rolm Systems (9751 Release 9006I)
Samsung Systems (Prostar 56EX, Prostar 120MX, Prostar DCS)
Siemens Systems (Hicom 300 E, Saturn I, Saturn II, Saturn III)
Southwestern Bell Systems (Larndmark DKS 308, Landmark DKS 616)
Sprint Systems (Protoge)
Sun Moon Star Systems
Tadiran Coral Systems (Coral 9.87, Coral I, Coral II, Coral III)
Telrad Systems (Digital Key BX)
Toshiba Systems (DK280, DK424, Perception E, Perception I, Perception II, DK16, DK24, DK56, DK96, Strata VI E)
Trillium Systems (Panter II, PAnther 820, Panther 1032, Panther 2064)