We have a mailbox (oncall@xxx.com) we use to push sync contacts for the person on call. We add it to users iphones using the the actual email account (oncall@xxx.com) and only sync contacts. Everyone once in awhile their default contact list on their iphone will get changed and they start adding personal contacts to the on call contact list.
Is there a way to prevent a mail user in this case oncall@xxx.com from saving contacts to their own contact list? This way if the default contact list on the iphone gets changed they will not be able to save personal contacts to the on call contact list.
Exchange 2013