If you are using Google Apps or other calendars and cannot use the Amazon Chime for Outlook Add-in you can following the instructions below to include International and toll-free dial-in numbers.
See this article if you are using the Amazon Chime for Outlook add-in: https://answers.chime.aws/questions/127/how-do-i-include-dial-ins-for-other-countries-in-m.html
To add International dial-in numbers from within the Amazon Chime Windows, macOS, or web app:
View the Amazon Chime User, Administration Guide and API Reference on the AWS Documentation site.
Find more information about the Amazon Chime solution, pricing, customer references, getting started, and other resources.