I implemented RingCentral on my own for a team of 10 while working in sales (I am not an IT guy). It is super easy to implement and I've found the support to be very helpful. Support is in the Philippines, but speak very good English and have always fixed any issue I had.
I then went to an IT company and after a company full of IT guys couldn't implement Microsoft Teams Calling, I convinced them to go with RingCentral and I implemented it for a team of 20 while working in Finance.
Both implementations were successful and I'd recommend RingCentral anywhere. Although, I've never had to use the Call Center functionality of RingCentral so I can't speak to that.
I love that RingCentral just works, it's extremely reliable. The apps for the desktop and cell phone are very easy to use and require little to no training. I love that I can be anywhere in the world and take a phone call, I am not tied to a desk. I love that I can configure it on my own and I don't have to rely on an outside IT company every time we have a new user to setup.
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Or do you use the Linux subsytem in Windows, emulation tools like DosBOX and WINE, or mobile device emulator/simulators? What's your favorite ways you've used virtual machines and emulation?