WebCIS has a function called "Send my Roster Update".

Enter the email address  update@rostersms.com  into the field and click Save.

WebCIS will send your roster to the RosterSMS system every time there is a change.

You should initialise RosterSMS with a copy of your roster by following the instructions at How do I manually update Roster Calendar?

(If you cannot save your email address in WebCIS see WebCIS will not save my email address, what do I do?)