"Hoot n Holler over IP"

I am referring to "Cisco Hoot and Holler over IP" document. I intend to present this to customer by installing Cisco 1760-V(with E&M) on their trading floors in 5 Asian location and riding on the IP WAN. However I need to think of some workaround here as the IP WAN doesn't IP multicast currently, but it seems the whole idea behind Hoot over IP is by IP multicast!
I wonder whether building full mesh "GRE tunneling" between 5 locations can help here. Also there seems to be no obvious definition in this application for "source", "receiver" or "RP" as in the multicast story.
Appreciate if you could shed me more light. Thanks.

Hoot and Holler over IP works inside GRE however solid QoS becomes a challenge. Your class-maps need to provide enough bandwidth for: "Codec Bandwidth + IP Overhead + GRE Overhead * 3" (The DSP will not mix more than the 3 loudest signals). We found that even with the right amount of bandwidth reserved, sometimes Hoot inside GRE would break up.
Also you won't need a full mesh, to make your life easy build your tunnels directly to an RP or an RP mapping agent.
In 2-way hoot and holler, everyone is a source and a receiver. You'll want an S,G for each location to ensure full 2-way communication for every location.

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