Hi Rachana,
please have a look at the IS Administrators Guide and the IS Built-In-Serivces Guide for details.
In IS Admin you will need to configure the SFTP Server Alias and SFTP User Alias.
The User Alias is need when connecting to the SFTP Server.
In your code replace the services being invoked from pub.client.ftp:* to pub.client.sftp:*.
Make sure you have SCG_9.5_SP1_TPL_Fix2 and IS_9.5_SP1_Core_Fix12 (or newer) applied to your IS as there were some issues when configuring or connecting to SFTP servers.
Regards,
Holger
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