- Allen Tel
- AT&T
- Benner-Nawman, Inc.
- CEECO
- Clarity
- Crosley
- Elcotel
- EnGenius
- Fanstel
- G-TEL Enterprises, Inc.
- GE
- Geemarc
- General Cable
- Grace Digital
- Harris Corporation
- jWIN
- Panasonic
- Philips
- Plantronics
- Protel
- RCA
- Syspine
- Ultratec
- Uniden
- Viking Electronics
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