You can display Contacts in the phonebook, to do this use the LDAP filter below:
(&(objectCategory=person)(|(objectClass=user)(objectClass=contact))(!userAccountControl:1.2.840.113556.1.4.803:=2))
Paste the above line into the text box beneath ‘Active Directory Query’ on the admin page, you’ll need to then click Save and then click the ‘Sync DB Now’ button. When the sync completes contacts and users will be shown in the phonebook.