Available in the Field Engineer marketplace are experts with Voice over Internet Protocol (VoIP) skills, which is a mix of voice, video, and knowledge on one network. VoIP allows people to make telephone calls over broadband Internet connections rather than analog landlines. A VoIP engineer designs, tests, installs and maintains both local VoIP systems in business and large networks that cover entire regions.
https://www.fieldengineer.com/skills/voip-engineer