+---------------+
		  |    Sender     |
   |    |         |  2001:db8::a  |
   |    |         +---------------+
   |Data|                 |
   |Flow|      Multicast  |
  \|    |/      Network   |
   \    /                 |        5: Propagate RPF for Join(S,G)
    \  /          +---------------+
     \/           |   AMT relay   |
		  | 2001:db8:c::f |
		  +---------------+
			  |        4: Gateway connects to Relay,
				      sends Join(S,G) over tunnel
			  |
		 Unicast          
		  Tunnel  |        3: --> DNS Query: type=AMTRELAY,
				  /        a.0.0.0.0.0.0.0.0.0.0.0.
      ^                   |      /         0.0.0.0.0.0.0.0.0.0.0.0.
      |                         /          8.b.d.0.1.0.0.2.ip6.arpa
      |                   |    /      <-- Response:
  Join/Leave       +-------------+         AMTRELAY=2001:db8:c::f
   Signals         | AMT gateway |
      |            +-------------+
      |                   |        2: Propagate RPF for Join(S,G)
      |        Multicast  |
		Network   |
        	          |     1: Join(S=2001:db8::a,G=ff3e::8000:d)
		   +-------------+
		   |   Receiver  |
		   |  (end user) |
		   +-------------+