Configure external communications

You can control Skype for Business Online access to Lyncusers in other organizations.

Configure federation with external domains

1. Click Admin > Lync to go to Lync admin center.

2. Click organization > external communications.

3. Under external access, choose an option that controls your access to other organizations using Lync:

   • Off completely

   • On except for blocked domains

   • On only for allowed domains

4. Under blocked or allowed domains, you can Add , Edit , Remove , or Search the list of domains as appropriate.

Keep in mind:

• The organization you’re federating with must also allow federation with your domain.
• When you’re communicating with someone in a federated domain, you can only use Lync features (for example, video conversations or desktop sharing) that are turned on in both organizations.