Calls not going through to a Teams user - '603 Call Declined' in the call log
In the left navigation, go to Users > External access.
Turn on the Users can communicate with other Skype for Business and Teams users setting to enable External Access..
If all Teams external organizations are to communicate with the organization, skip the next step; the Microsoft tenant is ready for external access.
If a limit to the organizations that can communicate with users in the organization is needed, either allow all except some domains, or allow only specific domain
- To limit communications to specific organizations, add those domains to the list with a status of Allowed. Once these are added any domain to the Allow list, communications with other organizations will be limited to only those organizations whose domains are in the Allow list.
- Be sure to add the Phone App domain ( call2teams.com ) to the Allow list.
- Click Save.
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