Question: In an IP Multimedia Subsystem (IMS), which of the following scenarios does not necessarily require the Serving-Call Session Control Function (S-CSCF) to record-route for subsequent requests?
Option 1: Peer-to-peer multimedia telephony with media parameter control and offline charging.
Option 2: Client-server based video download from an Application Server (AS) in the home operator's domain, utilizing event-based content charging.
Option 3: Network-initiated session release for administrative reasons in ongoing IMS sessions.
Option 4: Real-time online gaming services with direct User Equipment (UE) to UE communication, bypassing Application Servers.
Explanation: For client-server based services like video download from an Application Server (AS) within the home operator's domain, the AS can manage allowed media parameters, handle event-based charging, and terminate sessions independently. This scenario might not necessitate the S-CSCF to record-route subsequent requests, especially if configured with 'no record-routing' along with initial filter criteria, to reduce load on the S-CSCF and allow service control from the AS.