For outgoing calls you can do Telephone Directory > Associated Directory Numbers and do CPN Substitution for each DN.
Thanks! This worked.
EDIT: it only works when i dial in internal extension, when i call outbound to a mobile they still see my original mobile number, how do i hide my mobile number and present the ring group number?
I tested it with a single extension, which i logged into the Personal Ring Group so as to have external hotdesking active, and then i logged in to the Ring Group.
I did CPN substitution only on my personal extension, and it displayed the group number.
I tried putting in the Ring Group number in as Directory Number as well as Associated Number, then i get a "This directory number cannot accept an associated number" error message. Now i am guessing the issue is that if i am not Present in the Ring Group and make an outbound call, it will still display the Group number instead of my personal extension. How can this be fixed?
And for inbound calls, how do i change this? Is this a setting on the COS/COR of the ring group? I just want to override what is on the trunk.