Add information to the FTP and SFTP server and client logs regarding what was negotiated during a successful security handshake.
For SSL/TLS this would include the protocol version(SSLv3.0, TLSv1.0, etc.), the cipher agreed upon and the client source IP.
For SFTP/SSH this would include the protocol version (v2, v3, etc.), the cipher agreed upon, the MAC Suite agreed upon, the Key Exchange agreed upon and the client source IP.
This information should be recorded for both the incoming connections (SI is the server) and the outgoing connections to listening trading partners (SI is the client).
This information is not currently available in the SI logs even when logging is turned on.