· Solution A: Use a central CallManager (perhaps redundant CallManagers) with each office being a
separate region. Intra-region calls can be G.711, but inter-region calls can be G.729 (unless to voice mail).
Limit WAN bandwidth at each egress point and block calls that will exceed that level.
· Solution B: Put a CallManager in each location and network them together using H.323 (running on a
Cisco IOS gatekeeper). You can then use the zone bandwidth feature to limit the number of calls and force
overflow to the Pub lic Switched Telephone Network (PSTN)....