Setting up Microsoft Teams to make phone calls

tolsoneaglemount 

To make outbound/inbound calls via the public phone network, you'd be using cloud voice. There's a lot more to explain there than I can do justice to in a short post.

This is one of those places where reading some of the docs before you start is a really good idea. I would read some of the basics on phone system licensing, calling plans and so on.

https://docs.microsoft.com/en-us/MicrosoftTeams/cloud-voice-landing-page

To allow calls to come back to your receptionist is either an auto-attendant, a call queue, or a combination of the two (depending on how you want to route calls).

For you to experiment on a personal level, you'd need a phone system license and a calling plan for you. You'd also need to be an admin so you can administer Teams settings for the org. I would start there and gain some basic understanding of Teams and voice before I would try to bring on the entire org.

Good luck.