Hello, In order to allow ACL authentication, ACL is defined for FreeSWITCH and IP address is entered in CIDR format. A /32 will have only 1 IP and /24 will have 254 IP address range. Now, FS will allow the call if the IP address falls under the subnet. For example, caller IP address is 192.168.10.24 while the ACL node is defined as 192.168.10.0/24. This works fine, but when it come to identify the incoming call for billing purpose, how can we identify the IP address matches to which customer? Or which ACL node for FreeSWITCH. One possible solution is to expand the CIDR used by FS, and then match the caller IP address, but I guess this will take too much resources. Am I missing something here? Or restrict the user to enter only 1 IP address per account? Thanks, Goni