Question: In an IMS (IP Multimedia Subsystem) session setup, what is a requirement for coordinating between Session Control and QoS Signalling/Resource Allocation regarding bearer establishment?
Option 1: Bearer resources must always be allocated after session establishment is completed.
Option 2: The destination user must always participate in determining which bearers are established.
Option 3: End-to-end QoS signalling can only occur after bearer resources have been allocated.
Option 4: It shall be possible for an application to request that the resources needed for bearer establishment be successfully allocated before the destination user is alerted.
Explanation: This option correctly reflects a key requirement, highlighting the importance of flexible resource allocation timing in relation to session setup and user alerting, ensuring applications can prioritize resource allocation based on their specific needs, enhancing overall QoS management in IMS sessions.