I have an interview with Sitel. If you've interviewed with them can you share your experience?

I recently applied to work for Sitel. I did a quick assessment and afterwards I was asked to setup an appointment to be interviewed. I was surprised because usually the company looks at your results before deciding if they want to interview you. I'm not complaining though. I'm nervous because I don't know what to expect. Has anyone been interviewed for the work from home position with this company? What kind of questions do they ask? How long is the interview? Please feel free to share your experience. Thank you.