The Institute houses a private automatic exchange and users inside use a four digit number called the local extension number to contact others. People outside the Institute but within the city will have to use a Seven digit number. The Subscriber Trunk Dialing (long distance dialing) code for the chandigarh is 0172 and persons living within India may dial the PEC number as 0172 -275 - Extn Calls to the Institute from other countries will have to be effected through the sequence +91 -172 - 275 - Extn.

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