Question: For WebRTC clients accessing the IP Multimedia Subsystem (IMS), what is the primary source for determining the supported audio and video codecs, according to 3GPP specifications?
Option 1: IETF RFC 8825 for direct and indirect codec references
Option 2: Implementation-specific means within the User Equipment (UE)
Option 3: Standard Gm interface exposed by the UE towards IMS
Option 4: IMS-specific standards for multimedia telephony media handling and interaction
Explanation: When WebRTC clients access the IMS, the supported audio and video codecs are specifically outlined in IMS-specific standards for multimedia telephony media handling and interaction. This deviates from general WebRTC specifications, emphasizing adherence to IMS-specific standards for seamless integration. Options 1, 2, and 3 are incorrect because general WebRTC codec requirements do not apply for IMS access, UE implementation specifics are not the primary source, and the Gm interface does not dictate codec support.