+----------------------+
|     Application      |
+----------------------+
           |
           | (1) New Application Data Unit (ADU)
           v 
+---------------------+                           +----------------+
|    FEC Framework    |                           |   FEC Scheme   |
|                     |-------------------------->|                |
|                     | (2) New ADU               |(3) Update of   |
|                     |                           |    encoding    |
|                     |<--------------------------|    window      |
|(5) Construct FEC    | (4) Explicit Source       |                |
|    Source Packet    |     FEC Payload ID(s)     |(7) FEC         |
|                     |<--------------------------|    encoding    |
|(9) Construct FEC    | (8) Repair FEC Payload ID |                |
|    Repair Packet(s) |     + Repair symbol(s)    +----------------+
+---------------------+
    |             |
    |(6) Source   |(10) Repair payloads
    |    packets  |
    |      + -- -- -- -- -+
    |      |     RTP      |
    |      +-- -- -- -- --+
    v             v                 
+----------------------+ 
|  Transport Protocol  |
+----------------------+