The size of your corporation determines whether it needs a contact person or a secretary. Small and medium corporations have a contact person and large corporations have a secretary.
A contact person acts as a mail box for their corporation—their job is to pass on all communications (letters, emails, telephone calls and messages) to at least one of the directors of the corporation within 14 days of receiving them.
A secretary is also the central contact point for their corporation but they have additional duties. Because large corporations usually have greater legal responsibilities and more administrative tasks to perform, the secretary's role is to assist the directors in meeting them.