Cisco Systems, Inc. is an American multinational technology conglomerate headquartered in San Jose, California, in the center of Silicon Valley, that develops, manufactures and sells networking hardware, telecommunications equipment and other high-technology services and products.

Avaya is an American multinational technology company headquartered in Santa Clara, California that specializes in business communications, specifically unified communications (UC), contact center (CC), and services

Fanvil is an established VoIP desktop phone developer and manufacturer from China. Fanvil has grown into one of the largest and most popular brands of VoIP phones around the world after recognizing the global demand for VoIP based telecommunication solutions. Fanvil produces devices for small and medium sized businesses, as well as large mission-critical enterprise environments. It is set to become a leading global IP voice and video terminal manufacturer, by providing cost efficient and innovative IP voice and video products. Fanvil VoIP devices encompass quality, style and value for money.

Polycom is an American multinational corporation that develops video, voice and content collaboration and communication technology

Snom Technology GmbH is a German company which manufactures Voice over Internet Protocol (VoIP) telephones, based on the IETF standard Session Initiation Protocol (SIP). Snom's products are targeted at the small- to medium-sized business sector, home offices, Internet service providers, carriers, and original equipment manufacturers

Yeastar specializes in the design and development of innovative telecommunications equipment, including VoIP PBX systems and VoIP gateways for the SMB