Aircall.io is a VOIP solution to handle your calling for your business. I've gone ahead and tested it out using it with Hubspot. It is currently (May 2021) the most downloaded app for Hubspot under the VOIP category.
Having switched over from Justcall.io I can tell you that Aircall had a pretty easy to use interface, better call quality and integrated very well with Hubspot.
I sadly, didn't realize that they didn't also do texting (coming soon) just yet and for us that was a deal breaker even though I attempted another app for texting our sales time had a hard time using two different apps, having to switch back and forth.
Pricing starts at $30/User and goes up to $70/User.