• TATA Teleservices Ltd. (Delhi, Rajasthan, Punjab, Haryana, UP)
  • Vodafone Ltd.
  • Idea Cellular Ltd.
  • Bharti Airtel Ltd.
  • Videsh Sanchar Nigam Ltd.
  • ITI Ltd.
  • North Delhi Power Ltd.
  • Reliance Infocomm Ltd.
  • Delhi Metro Rail Corporation Ltd.
  • Siti Cable
  • Fibcom Ltd.
  • Siemens Ltd.
  • Alstom Ltd.