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[AVT] ULP FEC question



Hello,
 
I am new to the mailing list and currently working on improving the robustness of VoIP applications to packet losses.
I would have a question regarding the draft entitled "An RTP payload format for generic FEC with uneven level protection".
I don't really see how UEP is achieved in the third example with 2 protection levels (p. 17). Is ULP level 1 (for ULP packet #2) performed on all 4 packets or simply the last two? Are you automatically generating a new ULP packet for every protection level? 
 
Thank you all in advance!
 
-Christine Pepin