Some few people, usually executives, have in their office a normal desk phone and a “Red Phone”. The red phone has a number only Very Important People know about. What about this functionality in Lync? In Lync we have a option called “Private Line”. This is an additional telephone number you can assign to a person in Lync to facilitate an extra “Private” line. This private line by-passes all team delegates and rings directly to the person assigned with the private number.
How to enable the Private Line feature:
To verify the assignment run :
Get-CsUser -identity “sip: sipuri” |Select-Object Displayname, lineuri, privateline
Close Lync and open it again. When a person calls you at your private line number you see a notification in the gold bar saying “Private call”
Additional you can change the ringtone for this number aswell in your Lync Client options: