Usually the IT department deals with domain management. Due to fewer resources IT departments might want to wish to part with some of the domain tasks in all its breadth in order to concentrate on the core tasks around DNS. Responsibility for domain protection is transferred to Marketing or Corporate Communications or the Legal department.
In this context outsourcing the domain management might become an option. The IT department relieves itself of domains and Marketing or Legal are strengthened with managed IP's know-how and experience. You might also go through these four phases to improve global domain management.