+----------------------+
|     Application      |
+----------------------+
           ^
           |(6) ADUs
           |
+----------------------+                           +----------------+
|    FEC Framework     |                           |   FEC Scheme   |
|                      |<--------------------------|                |
|(2)Extract FEC Payload|(5) ADUs                   |(4) FEC Decoding|
|   IDs and pass IDs & |-------------------------->|                |
|   payloads to FEC    |(3) Explicit Source FEC    +----------------+
|   scheme             |            Payload IDs
+----------------------+    Repair FEC Payload IDs
    ^             ^         Source payloads
    |             |         Repair payloads
    |Source pkts  |Repair payloads
    |             |
+-- |- -- -- -- -- -- -+
|RTP| | RTP Processing | 
|   | +-- -- -- --|-- -+
| +-- -- -- -- -- |--+ |
| | RTP Demux        | |
+-- -- -- -- -- -- -- -+ 
           ^
           |(1) FEC Source and Repair Packets
           |         
+----------------------+ 
|  Transport Protocol  |
+----------------------+