This is a bummer but I’m going to say it.
Getting a huge fiber Internet connection may not do anything to help your company’s VoIP call quality.
Assuming everything is squared away on your LAN, the most common causes of poor call quality are latency, packet loss and jitter; None of which can be controlled over the public Internet, no matter how much bandwidth you throw at it.
“But what if we have a 1G dedicated Internet connection?” Sorry, it’s not immune.
“But what if it’s fiber from a Tier 1 provider?” Your call quality is still high-risk.