iOS | OXE phone numbers

How do I retrieve all oxe phone numbers at once?

Update

I have found this

func search(pattern: String) {
    ServicesManager.sharedInstance()?.contactsManagerService!.searchRemoteContacts(withPattern: pattern, advancedMode: true, limitPerCategory: 20, rainbowUsersOnly: true, search: SearchRemoteContactsMode.all, withCompletionHandler: { (text, contacts) in

        // Do something with the contacts found
        ...
    })
}

But this take pattern as argument, so its not ideal. I want to get all oxe numbers from single api call. How do I achieve this?