Office 365 Audio Conferencing explained

We are in the middle of transitioning our on-premise Lync environment to Microsoft's Skype for Business.

 

I am confused as to setting up audio conferencing and Microsoft Bridge. Here are a few questions I'm stumped on.

 

1. How to obtain a toll-free number for dial in?

- We received a local phone number, but we would like to get a toll-free too. Attempting to setup from Skype Admin console, i get an error saying I needed consumption billing setup. Can't find any good documentation on what consumption billing is..

 

2. What is consumption billing?

 

3. Do I need a domestic calling plan to get toll-free phone number for dialing-in?

- I called MS support, and the rep seemed as clueless as I did. He did some research and concluded that a Domestic Calling Plan is required to get a toll-free phone number for dial-in. Which seemed odd. We arent dialing out 

 

4. Communication credits?

- Would communication credits allow me to get the toll-free number?

 

5. Rates for using toll-free number?

 

Any other relevant information in regards to these topics would be helpful.