Scenario(s):

User Level: How to Block Phone Numbers in Microsoft Teams (Block Callers/no caller ID)

Group/Location: How to Block Calls for all end-users from a Group Admin Level via OSSmosis Portal

Solution: 

For User Level: Use Microsoft Teams to Block Caller/no Caller ID guide and instructions provided in this guide 

For Group/Location: Group Administrators can utilize OSSMosis: Blocked Numbers guide to blocking numbers for your location/group OR All Locations 

User Level Call Blocking 

https://support.office.com/en-us/article/manage-your-call-settings-in-teams-456cb611-3477-496f-b31a-6ab752a7595f

Block a Caller from the Calls (icon)→ Contacts page:


Manage (Edit) blocked contacts from User Level Settings: