[M4IF Technotes] 'config' parameter within the 'fmtp' SDP field

[Catrambone Giuliano]

Hi,
    The streaming server build the SDP for the answer to the RTSP DESCRIBE command.
    I know that the SDP 'fmtp' field, should contain the cpresent parameter.
    The streaming server decides if this parameter (cpresent) will be set to 0 or 1.
    In case of an AAC media track and the cpresent parameter is set to 0,
    how is able the streaming server to build the 'config' parameter?
    I know that the streaming server take the decoderSpecificInfo from the metadata (mp4a atom)
    and he add before and after to the decoderSpecificInfo some bits.
    From where he take these bits to build the config field?
    rgds
        giuliano
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