Pulling CDR data with specific SFTP user access

Due to security restrictions our customer wants to pull CDR date from SBC via SFTP to an external management system. Further more the customer wants to limit the SFTP Access to the SBC for this specific User to CDR data only. A daemon on the external mgmt system should provide this sftp transfer service and will access the sbc regularly to copy the CDR files. I believe this request can't being fulfilled with ECX 6.4, but I'm not sure about it? Further related question: It is possible to configure a specific CDR path within the SBC system, according to the