Here are some websites for some I have worked for. Basically you answer incoming calls from people wanting to order this or that. Just depends on what company you work for. You will need a dedicated phone line, computer and headset for most and no BACKGROUND noise.
West -
http://apply.westathome.com/
LiveOps -
http://www.liveops.com/
Right now I am with one company that requires you to incorporate.
Sorry I can't list the names of the actual companies cause of confidentiality forms I signed.
India