The new switchboard (48) 22 5532xxx (instead of the old one (48) 22 6283031) is installed in buildings at Hoza 69 and 74. You can contact the operator at (48)22 5532000 or dial directly (without help of the operator) using the extension xxx.
Locally the 5-digit extensions should be used: 32xxx. To phone outside the University (but in Warsaw) dial 00 before the number 22 xxxxxxx. To contact the operator dial 9.