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Will changing the IP Multicast addresses in use by each NBX cause any issues for the phones themselves? How do the phones know what Multicast addresses are set on the NBX?

Yes, This is what we already have GRE tunnels across the sites--that DO support Multicast traffic (although it's not yet turned ON. It's the Cisco DMVPN solution, which provides a Full-Mesh VPN tunnel connection between ALL Sites. The question I have, and our big concern, is how will the 3com...

VoIP over a regular internet VPN is possible, but it helps if you over-provision the network to help ensure better performance. (we have a minimum site bandwidth of T1-speeds, and only have 2 voice tie-lines to those sites). In our experience, turning on bandwidth-saving options like silence...

Ya, I've seen that; but even on their site they write: "...the NBX uses Multicast Groups, which are only fully supported by the most expensive routers and VPNs. When our small company was faced with the prospect of spending a ton of money on IGMP Multicast capable routers to fix this, we...

We have a number of (remote) office sites with their own 3com NBX 100 systems. We also have a 3com NBX 100 system at the local (main) site. Right now the sites are connected via Cisco DMVPN tunnels (all IP traffic allowed), and all Cisco routers currently do NOT have Multicast routing enabled...