NEW DELHI—Thanks to widespread outsourcing of telephone-service jobs, a sixth caste has blossomed in India: the Khidakayas, a mid-level jati made up of technical-support workers. "I am happy to be a Khidakaya," said technical-support agent Ranji Prasat, who speaks English with a flawless American accent and goes by the name "Ron" at work. "While we rank below members of the reigning order, those of us responsible for helping Americans track their online purchases and change their account PINs share many privileges not enjoyed by the merchant class below us." Prasat said he expects to marry another tech-support worker.