I think multicast is enabled properly.
"ip pim sparse" is enabled on the router with IGMP at layer 2.
On the router I see *,G and S,G entires in the multicast routing table pointing toward the AMS5 server's vlan.
From the windows server with AMS5 on it I can ping the multicast groups of various video speakers.
From the windows server with AMS5 on it I can run an application called "VBDirectory" that uses multicast to discover all vbrick devices.