Multicast-capable ISP
		      ^
		      |                  Office Network
	   +----------|----------------------------------+
	   |          |                                  |
	   |    +---------------+ (Wifi)   Mobile apps   |
	   |    | Modem+ | Wifi | - - - -  w/ embedded   |
	   |    | Router |  AP  |          AMT gateways  |
	   |    +---------------+                        |
	   |          |               +=======+          |
	   |          +---Wired LAN---|  AMT  |          |
	   |          |               | relay |          |
	   |     +----------------+   +=======+          |
	   |     | Legacy Router  |                      |
	   |     |   (unicast)    |                      |
	   |     +----------------+                      |
	   |      /        |      \                      |
	   |     /         |       \                     |
	   | +--------+ +--------+ +--------+=========+  |
	   | | Phones | | ConfRm | | Desks  |   AMT   |  |
	   | | subnet | | subnet | | subnet | gateway |  |
	   | +--------+ +--------+ +--------+=========+  |
	   |                                             |
	   +---------------------------------------------+