Prefix 286 to the extension number for Direct Inward Dialing. i.e. dial 286XXXX from outside the campus where 'XXXX' is the extension number. Add 0484 for calls from outside Ernakulam District.
eg. To get a person with extension number 2389 from outside the campus dial 2862389. Dial 0484-2862389 for calls from outside ernakulam District.