+--------+
  | Client |<--+
  +--------+   |
               |    ALTO    +--------+     Topology    +---------+
  +--------+   |  Protocol  |  ALTO  | Sync Mechanism  |   BGP   |
  | Client |<--+------------| Server |<----------------| Speaker |
  +--------+   |            |        |                 |         |
               |            +--------+                 +---------+
  +--------+   |
  | Client |<--+
  +--------+