If you don't want people to contact you in Cisco Jabber, you can block individuals or everyone from the same domain. For example, you can block everyone with email addresses from the .example domain. When you block people, they can't see your availability status or send you instant messages, even if you're on their contact list.
From the hub window, open the Settings menu, and go to Options. If you’re on an earlier version of Cisco Jabber for Windows, select instead.
The Options window opens.
Select the Privacy tab and then select Advanced.
Enter specific contact addresses or domains in the Block list.
Select Apply and then OK.