Question: In a Circuit Switched (CS) multimedia call based on H.324M, what happens when the setup of the multimedia call fails due to degraded network conditions?
Option 1: The call is automatically changed to a video-only call.
Option 2: The call will be set up as a speech call (fallback to speech) from the 3.1kHz Extended PLMN multimedia bearer.
Option 3: The call setup is cancelled, and a new attempt must be initiated by the user.
Option 4: The network automatically switches to a packet-switched (PS) domain for the call.
Explanation: According to requirements for CS multimedia calls, if the setup of the multimedia call fails (e.g., due to degraded coverage conditions), the call will fallback to a less preferred service, specifically to speech, ensuring the call can still be established in some form.