Agent in this context is the agent who has disconnected from the customer session. UUI can contain the agent identifier for only one agent. For example, in case of a call flow that has multiple transfers and multiple agents handling that customer call in a sequence then the UUI contains the agent identifier only for the last agent who spoke to the customer. In this case, the IVR or the VRU system with a post-call survey application receives the agent information only for the last agent and the customer rating is applicable only for that agent.