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Best practices for small, internet-critical company's ISP for maximal uptime

This is a small call center with maybe 20 employees. I do not know how many calls it is taking per day, how many field agents it is remotely dispatching, or how many customers it has, but you can estimate it is getting a five minute call once every ten minutes from 6am to 11:30pm at night (this is of course an average). These calls are from multiple states in the US. The calls are inherently connected to internet connectivity to input and retrieve important data regarding customers and jobs and such.

The internet should be fast and up ideally at all times. Recently we had our internet either go completely down or be unpredictably on and off for about 48 hours. Comcast Business / Xfinity said that there was some "scheduled maintenance" explaining the internet outage. We cannot as a business accept 2 days of scheduled maintenance, unfortunately.

Is there a very standard way in which a small internet-focused company can ensures a very high degree of internet uptime?

I called Comcast and they said all of their plans have the same uptime. They said normally small businesses get a plan from a second internet provider, for example AT&T, to reduce the chances of the internet going down. I am wondering if that is actually the best solution, or if it is an inefficient use of money.

What is the standard setup in this scenario?