Question: What is the mandatory file format for ensuring interoperability when transporting video with associated speech/audio in an IMS Messaging and Presence client, as per 3GPP specifications?
Option 1: 3GPP file format with Basic profile
Option 2: MPEG-4 Part 14 (MP4) with Extended profile
Option 3: ISO Base Media File Format with Main profile
Option 4: Advanced Video Coding High Profile (AVCHP)
Explanation: Ensuring interoperability in IMS Messaging and Presence clients for multimedia content, such as video with associated speech/audio, requires a standardized file format. The 3GPP file format with Basic profile is specified to achieve this interoperability, aligning with the technical specifications and implementation guidelines provided by 3GPP for consistent and reliable media transport across different client implementations.