Microsoft 365 Domestic and International Calling Plan - subscription license (1 year) - 1 user

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. With Domestic and International Calling Plan licensed users can call out to numbers located in the country/region where their Office 365 license is assigned to the user based on the user's location and to international numbers in 196 countries/regions.