Question: In EVS (Enhanced Voice Services) codec implementation, as per 3GPP standards, what is the significance of setting the RTP header marker bit (M) to 1 in an RTP packet?
Option 1: To indicate the end of a talkspurt in a voice communication session.
Option 2: To signal that the first frame-block in the RTP packet contains the first speech frame of a talkspurt.
Option 3: To notify the receiver of a change in audio bandwidth during an ongoing call.
Option 4: To synchronize the timestamp clock frequency between the sender and receiver.
Explanation: Setting the RTP header marker bit (M) to 1 is crucial for signaling the beginning of a talkspurt, specifically when the first frame-block in an RTP packet contains the initial speech frame. This helps the receiver identify the start of new speech segments within the audio stream, ensuring proper playback and minimizing potential voice clipping or artifacts. This usage aligns with efficient media transfer and session management principles in telecom networks.