setting callback on router using cisco ACS tacacs authentication

[admin_2]

before when user dial to my router which is 2611 with 16 async,he is authentacting by cisco ACS tacacs server which is on windows 2k server.now i want to implement the callback for some managerial persons,so what all things do i need to do for this on router and as well in ACS server?

looking for solution

[#2]

On the 2611 you need to enable callback

with the command "ppp callback accept".

On the ACS you need to authorize callback

for a particular user like such:

user = foobar {

chap = cleartext CCCC

service = ppp protocol = lcp{

callback-dialstring=xxxxx

}

}