Querying Contacts with ODATA

I am trying to perform a query that check some fields from the ContactSet, so it is my sentence:

ContactSet?$select=FirstName,LastName,MiddleName&$filter=FirstName eq'Ana'

The query only shows some Contacts because the User Role is not Administrator and it isn't show all.

Is there any way to query all the Contacts from the ContactSet CRM using OData? Any idea?

Regards.