What happens if the "Can manage the company phonebook" right is not given?

If the right to manage the company phonebook is not granted, extensions will retain the ability to view the contents of the phonebook, but they will be unable to make any alterations to it. This means that existing entries within the company phonebook remain accessible to users, allowing them to see contacts, but they cannot change, add, or remove any information from that shared resource. The focus here centers on maintaining the integrity and consistency of the company phonebook, ensuring that only designated individuals have the authority to make changes. Consequently, access is read-only for those without management rights.