Did you come up with an answer? Just to understand your requirement, you want to enable post call survey after an outbound campaign call and not after inbound calls..? coz post call survey normally works for inbound calls where a customer is supposed to call in, get his query addressed and after talking to an agent, gets a feedback survey. In your case, the flow would become as agent calls a customer while running the campaign. Then once the agent hangs up the call, the customer gets a feedback survey. Is that correct?