- AMTELCO
 - Designs, manufactures, and markets a variety of customised call centre systems. - Clearsonics
- Hands-free emergency and public information telephones designed for remote and harsh environments, incorporating noise filtering technology.
- Dolee Telecom
- Manufacturing and exporting telephone and voice mail systems.
- EDA, Inc.
- Specialising in telephony product design.
- Hello Direct
- Offers business and personal telephone productivity tools like headsets and telephone systems.
- MacroTel International Corporation
- Supplier of business telephone systems.
- T-Metrics, Inc.
- Manufacturers of PC-based operator consoles integrating telephone lines and directories.
- Tone Commander
- Manufacturer of ISDN and analogue attendant consoles, telephones, and NT1 ISDN network terminations.
- Vodavi Communications Systems
- Makes electronic and digital key telephone systems including single and two line telephones, PBX, voice processing systems and IVR systems, voice mail, and more.
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