working of a call center

• http://www.bbc.co.uk/news/magazine-15060641
• https://www.vodafone.in/pages/vodafone_offices.aspx?cid=kar
• http://jooble.co.in/search-vacancy-in/rgn-coimbatore/kw-vodafone-call-center
• http://www.vfreshers.com/perot-systems-coimbatore-fresher-call-center-openings/