Question: In an IMS (IP Multimedia Subsystem) Collaborative Session, what actions can a Controllee UE take regarding media flows that terminate on it, initiated by a remote party?
Option 1: Only accept or refuse media modifications, but not additions or transfers.
Option 2: Accept or refuse media modifications, additions (if pre-approved by the Controller UE), and transfers, but cannot initiate releases.
Option 3: Initiate modification or release, but can only accept (not refuse) changes initiated by others for media flows it terminates.
Option 4: No actions are allowed on media flows initiated by a remote party; all must be managed by the Controller UE.
Explanation: According to IMS Service Continuity principles, a Controllee UE can manage media flows terminating on it. This includes accepting or refusing modifications and additions (if pre-approved by the Controller UE) and transfers. Note that initiating releases is within its capabilities, contrary to an implied exclusion in Option 2. The correct interpretation emphasizes acceptance/refusal actions for remote party-initiated changes, highlighting Collaborative Session dynamics in IMS.