I also tested voice and video calling and they worked fine.
How a Teams user talks with a Skype consumer user Setting the parameter to true allows Teams users to communicate with Skype users. Use the Set-CsExternalAccessPolicy cmdlet together with the EnablePublicCloudAccess parameter to control whether Teams users can communicate with Skype users. You can enable the functionality in the Teams Admin Center (TAC)
VIDEO CHAT SKYPE FOR BUSINESS TO SKYPE HOW TO
How to enable Microsoft Teams and Skype consumer interop
VIDEO CHAT SKYPE FOR BUSINESS TO SKYPE CODE
The code is being rolled out to tenants at the moment. It’s now rolling out to tenants and should be fully rolled out by end of April. Evidently, there was enough demand for the feature for Microsoft to bring it to Microsoft Teams. The idea being a work user could contact there family, or maybe a supplier is using Skype consumer. One of the features of Skype for Business is that Skype for Business users can communicate with Skype consumer users.