Quite a few aircraft in our fleet call V1 on their own (V1-autocall), only call the PM has to do in that case is "Rotate". If we do not have automatic V1 calls we have to do it ourselves. No response on either call is required, but at V1 the CPT has to remove his hands from the thrust levers, and on "Rotate" of course rotation has to be started.
Personally i was trained to start saying V1 3kts earlier, however that is not SOP in my current company so i just do what they require.