how to support large volume,below ischat log

Project:a2billing,callback,callshop,ani,device2phone,pc2phone, multilayer level reseller, active calls
Component:Code
Category:feature
Priority:normal
Assigned:hfvoip
Status:active
Description

let's consider 5 asterisk +1 billing

basically
hfvoip: I think 1 db+billing server
hfvoip: each asterisk will use that billing
hfvoip: so customer can registerto any asterisk server
hfvoip: u need map your asteriskserver to srv1.asterisk.com,srv2.asterisk.com,etc
hfvoip: any asterisk can take the registration and calls
hfvoip: further
hfvoip: if u think 1 db+billing server is not strongenough
hfvoip: then we can do db replicate,also must consider db backup