Browse to https://phoneman.it.ox.ac.uk
In the self-service section, you will see this:
From left to right, this is ex-directory, University only and public.
Private - the number will not be shown in the Nexus Global Address List (GAL) or the Contact Search.
University only - the number will not be shown in the Contact Search but will be shown in the Nexus Global Address List (GAL).
Public - the number will be shown in the Nexus Global Address List (GAL) and the Contact Search.
For more information for administrators how to set these options in Phoneman, please see the instructions.
Ex-directory settings and voicemail
The default personal greeting for voicemail provides a greeting that announces your number even if you're set as ex-directory in phoneman. Some users may not find this satisfactory, so we recommend recording a personal greeting. This will override the voicemail system's default greeting, thereby preventing the system from reading out your number.