Question: In MBMS (Multimedia Broadcast/Multicast Service) using FLUTE (File Delivery over Unidirectional Transport), how is the destination port number for a FLUTE channel defined according to SDP (Session Description Protocol)?
Option 1: According to the "connection data" field ("c=") of SDP.
Option 2: According to the <media> field of the SDP description.
Option 3: According to the <port> sub-field of the media announcement field ("m=") of SDP.
Option 4: According to a separate, dedicated port assignment field in the FLUTE session descriptor.
Explanation: The correct definition for the destination port number in the context of FLUTE channels in MBMS, as per the provided telecom standards, is derived from the <port> sub-field within the media announcement field ("m=") of the SDP. This specific field is designated for specifying the transport protocol and port number used for the media stream, which in this case, would be utilized for FLUTE over UDP.