Calls to other Skype for Business and Microsoft Teams users are free, but if you want your users to be able to call regular phones, and you don't already have a service provider to make voice calls, you need to buy a Calling Plan. For more information, see Phone System and Calling Plans.
Here are the Calling Plans options:
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Domestic Calling Plan: Licensed users can call out to numbers located in the country/region where they are assigned in Microsoft 365 or Office 365.
Domestic and International Calling Plan: Licensed users can call out to numbers located in the country/region where their Microsoft 365 or Office 365 license is assigned to the user based on the user's location, and to international numbers in 196 countries/regions.
All users in the same country/region (this is the user country location defined in the licensing area of the Microsoft 365 admin center) with the same Calling Plan share a pool of minutes. For example, if you have 100 users located in the same country/region with a 120 minutes Domestic Calling Plan assigned, they share a pool of 12,000 minutes. All calls exceeding these minutes are billed per minute.
Visit Country and region availability to find out about monthly minutes available for each organization in each country/region.
Important
The country/region is based on the location of the user's license in the Microsoft 365 admin center > Active users and NOT the billing address listed under the Organization Profile in the Microsoft 365 admin center.
For detailed information about usage limits and terms of use, see Audio Conferencing complimentary dial-out period.
How to buy a Calling Plan
You must first purchase a **Phone System add-on license. To do that, sign in to the Microsoft 365 admin center and choose **Billing > Purchase services > Add-on subscriptions > Buy now.
Note
Depending on your plan, you may need to buy more add-ons before you can buy Phone System licenses. To learn more, see Microsoft Teams add-on licensing.
After you buy Phone System licenses, you can buy the Calling Plan by signing in to the Microsoft 365 admin center, choose Billing > Purchase services > Add-on subscriptions, and then clicking Buy now. You'll see the Calling Plans there.
You can buy and assign different Calling Plans to different users, depending on the needs of your organization. After you select the Calling Plan you need, proceed to checkout. You assign a plan to each user in the Microsoft 365 admin center. To learn how, see Assign Microsoft Teams add-on licenses.
Do you have a service provider that provides on-premises PSTN connectivity for hybrid users?
If so, you don't need to buy a Calling Plan. Office 365 Enterprise E5 includes the Phone System add-on, so you can proceed to checkout.
Then, assign the Enterprise E5 or Phone System add-on licenses to users in the Microsoft 365 admin center. To learn how, see Assign Microsoft Teams add-on licenses.
Pricing information
For more information
Here are more articles that explain how to set up your Calling Plans:
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