Question: In 3GPP-supported multimedia conversational services, what are the key requirements for synchronizing media components like voice and video in applications such as video telephony?
Option 1: High storage capacity for simultaneous media streaming
Option 2: Low end-to-end delays (< 100 ms) and low delay variation between media components
Option 3: Support for only unidirectional communication to reduce complexity
Option 4: Mandatory use of text messaging as a fallback for failed video connections
Explanation: Conversational services, such as video telephony and video conferencing, require real-time interaction with minimal latency to ensure a seamless user experience. Thus, having low end-to-end delays (less than 100 ms) and maintaining a high degree of synchronization between different media components (achieved through low delay variation) are crucial for effective communication in these services.