| source                               ^ source 
 | packets                              | packets
 v                                      | 
+------------+                      +------------+ 
| Transport  |                      | Transport  |
|            |                      |            |
| +---+ +--+ |             signaling| +---+ +--+ |
| |FEC| |CC| |             recovered| |FEC| |CC| |
| +---+ +--+ |               symbols| +---+ +--+ |
|            |                   <==|            |
|            |network        network|            |
|            |packets    information|            |
+------------+ ==>               <==+------------+

    SENDER                              RECEIVER