How to connect SFTP server through ABAP program

Hi Friends

I already did a coding in ABAP for read and write files in FTP server, its working fine.

But instead of FTP, if client is going to use SFTP server.So in that case how can I write abap code to connect into SFTP server.

I seached a lot, but I am not able to come one conclusion about this topic.

So anybody have an experiance in that area, kindly guide me to read and write files from FTP and into FTP.

Thanks in advance

Regards.

Gowrishankar