Due to the potentially sensitive nature of CDR records, a secure transport mechanism is used for all communications between the CDR adjunct and the server such as Secure File Transfer Protocol (SFTP). Periodically, the CDR adjunct must log on to each of the administered Session Manager servers and retrieve the CDR data files that are available.

If firewalls are implemented anywhere between the CDR adjunct and the various Session Manager servers, it may be necessary to punch pinholes in those firewalls to allow communication between the CDR adjunct and the servers.