Fabricants de téléphones de bureau

Plantronics, Inc. is an American electronics company – branded Poly to reflect its dual Plantronics and Polycom heritage – producing audio communications equipment for business and consumers. Its products support unified communications, mobile use, gaming and music. Plantronics is headquartered in Santa Cruz, California, and most of its products are produced in China and Mexico. On March 18, 2019, Plantronics announced that it would change its name to Poly following its acquisition of Polycom, although it continues to trade on the New York Stock Exchange as Plantronics, Inc.

Snom Technology GmbH /snʊm/ 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. The company, founded in 1996 and headquartered in Berlin, is a wholly owned subsidiary of VTech Holdings Limited, since 2016. Snom was founded in 1996 in Berlin, Germany, by Christian Stredicke and Nicolas-Peter Pohland, former computer scientists at the Technical University of Berlin.[1] In 1999, the company began producing VoIP telephones with the introduction of the snom 100 model.

Cisco Systems, Inc. is an American multinational technology conglomerate corporation headquartered in San Jose, California, in the center of Silicon Valley. Cisco develops, manufactures and sells networking hardware, software, telecommunications equipment and other high-technology services and products. Through its numerous acquired subsidiaries, such as OpenDNS, Webex, Jabber and Jasper, Cisco specializes in specific tech markets, such as the Internet of Things (IoT), domain security and energy management. On January 25, 2021, Cisco reincorporated in Delaware.