Question: In IMS (IP Multimedia Subsystem), which of the following session redirection scenarios occurs after the initial setup of the communication pathway (bearer establishment)?
Option 1: Session Forward Unconditional
Option 2: Session Forward Busy
Option 3: Selective Session Forwarding
Option 4: Session Forward No Answer
Explanation: Session redirection can occur at various stages of session establishment in IMS. While most forwarding scenarios like "Unconditional", "Busy", and "Selective" typically redirect sessions before the bearer (communication pathway) is established, "Session Forward No Answer" logically occurs after the initial setup of the communication pathway (bearer establishment). This is because the decision to forward due to 'no answer' can only be made after a call has been set up and the called party fails to respond within a certain timeframe. Thus, it's the scenario most likely to happen post-bearer establishment.