You can control Skype for Business Online access to Lyncusers in other organizations.
Configure federation with external domains
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Click Admin > Lync to go to Lync admin center.
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Click organization > external communications.
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Under external access, choose an option that controls your access to other organizations using Lync:
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Off completely
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On except for blocked domains
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On only for allowed domains
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Under blocked or allowed domains, you can Add
Keep in mind:
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The organization you’re federating with must also allow federation with your domain.
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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.
