- Alcatel:
- 100 Key
- 100-64/144
- OPUS 20
- OPUS 40/80
- Comdial:
- Americom
- Eloquence
- Impact SCS
- Solo
- Digitech
- Executech
- Impression
- Unisyn
- DSU
- Express
- DXP
- FX
- Voice Express
- DXP Plus
- Impact
- Max Plus
- Interchange
- Dx 80
- Scout
- Conversip
- Executone / Isoetech:
- Inter-Tel:
- ITT / Cortelco / eOn:
- 1664
- 3100
- 701/801/802
- Aries/401/616
- Aries Digital
- ECS
- Millennium
- Odyssey
- Iwatsu:
- Key System USA:
- Key Voice:
- Small Office
- Corp Office
- Debut
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- Lucent / Avaya:
- Spirit
- Merlin
- Merlin II
- Partner
- Partner II
- Partner Plus
- Legend
- Classic Mail
- Definity
- Magix
- ACS
- NEC / Nitsuko:
- Pro I/II
- Elite 48/192
- Electra 824
- NEAX 2000 IVS
- Portrait 8/24 DSU1
- Northern Telecom:
- Meridian Key System
- 308 / 616 / 824
- Panasonic:
- DBS
- VA
- KXTD
- KXTA
- KXT
- SDBS
- Samsung / Macrotel:
- Sprint:
- TIE:
- Businesscom
- EK616
- 612
- Mod Key 16
- DS01
- ONY VS
- Toshiba:
- Vodavi:
- DHS
- DVX Plus
- Starplus
- Infinite
- Triad
- STS
- Telenium
- Voysys:
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Repair