Sender Network
		 +-----------------------------------+
		 |                                   |
		 | +--------+   +=======+  +=======+ |
		 | | Sender |   |  AMT  |  |  AMT  | |
		 | +--------+   | relay |  | relay | |
		 |     |        +=======+  +=======+ |
		 |     |            |          |     |
		 |     +-----+------+----------+     |
		 |           |                       |
		 +-----------|-----------------------+
			     v
			  Internet
		       (non-multicast)