- Comdial
- ESI
- Telrad
- Iwatsu
- Samsung
- Nitsuko-Tie
- Executone-Isoetech
- Toshiba
- Cisco
- Tadiran
- Inter-Tel-Axxess-Axxent
- Nokia
- Nortel-Norstar
- Inter-Tel-GMX-IMX-GLX-Premier
- ATT-Avaya-Lucent
- Miscellaneous
- Trillium
- NEC
- Panasonic
- Other Phone Systems
- Mitel
- Walker-WIN
- Fujitsu
- Tie
- Vodavi
- Vertical Networks
- Active Voice
- Joys folder
- Sato
