Given below is the link of IIT Delhi Telephone Directory.
All the telephone contacts at IIT Delhi are available in this directory, and also there are emergency contacts given below. In case you don’t know whom to call,
just call the Main Control Room (+91-11-2659-1000). You are advised to save some important contacts in your phone as well.
Download a PDF of the directory from http://rti.iitd.ac.in/rti/rtiteldir.pdf
You have to use DID code(+91-11-2659) before any number.