Hi, Could some body help on my requirments.? Below are my requirments. 1) When the radius server recives a accounitng start , accounting stop and Accounitng Intermediate update the free radius should pass on its attributes to another external funciton. 2) Based on the call back function or any other interface from external program the free radius should send a Accounting response message back based on the attributes value retrived from the other function. For the first requirment i have a understaning to follow the below Using the acct_users file based on the acct_status_type using Exec_program attributes values could be passed as command line arguments. The varibales for the same can be defined in variables.txt. For the second requitment i do not have any clues , how to achive that. It whould be great help if any inputs given on the above requirments. Thanks and regards Shankar ganesh