proxy auth and acct to different destination

[Bill Yuan]

Hi,

in the proxy.conf, we can config as below to handle realm "ABC"
realm ABC{
 authhost = radius.example.com:1812
 accthost = radius.example.com:1813
 secret = testing123
}
which means proxy to different destinations, but with the same secret.
what if we have different shared secrets for auth and acct server?

Regards,
Bill Yuan