Hello Vasco,
Yes it is possible to use an Agentless Campaign and transfer live voices to an Outbound Architect Flow and conduct a survey.
As far as the results, we cannot currently store them in the contact list. However, the flow would have access to all the contact list properties such as the contactID, phone number, etc. You could build a web services data action to store these properties along with the survey results in an external DB.
Hope this helps!
Chad