Cisco

Cisco Systems, Inc. is an American multinational digital communications technology conglomerate corporation headquartered in San Jose, California. Cisco develops, manufactures, and sells networking hardware, software, telecommunications equipment and other high-technology services and products. 

3CX Business Communication Solutions & Software

3CX, Inc. is a software development company that creates the 3CX Phone System, a software-based private branch exchange (PBX) using the SIP standard for calls via PSTN or VoIP services.

Avaya

Avaya LLC is a multinational technology company based in Morristown, New Jersey, specializing in cloud communications and workstream collaboration services, including unified communications and contact centers. In 2019, it served 220,000 customer locations across.

Yealink

Yealink is a global brand specializing in video conferencing, voice communications, and collaboration solutions. It leads the global market in SIP phone shipments and is recognized for its innovation, quality, and user-friendly experience.