I applied online. The process took 2 weeks. I interviewed at BT Group (Telephone, TX) in Feb 2016
Interview
One phone call, asked lots of questions said they would be back in touch but did not hear back form them. eventually i got the standard email reply that I had not been successful.
I applied through a staffing agency. The process took 1+ week. I interviewed at BT Group (Calcuta)
Interview
Very simple process of selection. It starts with an HR Round (sometimes telephonic - depending upon your current location) followed by Hiring Manager round which may also be a telephonic but they prefer this to happen one to one, then HOD round (Final - depending upon the criticality of the role), sometimes they skip HOD round. Finally closure with another HR round for salary discussion/joining dates/negotiations.