Question: In a 3G-324M terminal context, how are H.245 messages typically allocated bandwidth within the H.223 multiplex structure?
Option 1: Bandwidth for H.245 messages is pre-allocated at a fixed rate throughout the session.
Option 2: Bandwidth allocation for H.245 messages is dynamic and occurs on an as-needed basis, conserving bandwidth for other media.
Option 3: H.245 messages are transmitted over a separate, dedicated physical channel to ensure priority.
Option 4: Bandwidth for H.245 is allocated in equal shares with audio and video streams throughout the session.
Explanation: This is correct because H.245 messages, which primarily occur at the beginning and end of a session (e.g., for master/slave determination, capabilities exchange), do not constantly require bandwidth. Allocating bandwidth on an as-needed basis optimizes the use of limited resources, ensuring that video and audio streams, which are more bandwidth-intensive and continuous, receive sufficient allocation to maintain quality. This approach aligns with efficient network resource management in telecom networks.