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Direct Dial Tie Lines

Use these MIT direct-dial numbers to avoid message-unit or toll charges when calling the institutions listed below. If your phone is restricted to on-campus calling, you must use the tie lines to call these institutions. Enter the three- or four- digit code plus the appropriate extension number.

To call...
If extension is known, press...
If extension is unknown*, press...
Main phone number
American Academy of Arts and Sciences 195 + three digits 195 + 000 617.576.5000
Bates Linear Accelerator 3 + four digits 3-9200 617.253.9200
Draper Laboratory 182 + five digits 182 + 0-0000 617.258.1000
Endicott House 3 + four digits 3-5211, 3-5212, 3-5213 781.326.5151
Harvard Business School 186 + five digits 186 + 5-5000 617.495.6000
Harvard Medical School 1862 + four digits 186 + 5-5000 617.495.1000
Harvard University 186 + five digits 186 + 5-5000 617.495.1000
Lincoln Laboratory,
Haystack Observatory,
Millstone Radar Site
181 + four digits 181 + 0000
(Off hours: 181 + 2444)
781.981.5500
Massachusetts General Hospital 1936 + four digits 1936 + 2090 617.726.2000
Massachusetts General Hospital, Ellison Bldg. 1934 + four digits 1936 + 2090 617.726.2000
Mount Auburn Hospital 194 + four digits 194 + 0111 617.492.3500
Radcliffe College 186 + five digits 186 + 5-5000 617.495.8000
Wellesley College 187 + four digits 187 + 1000 781.283.1000
Woods Hole Oceanographic Institution 188 + four digits 188 + 1000 508.548.1400
*Ask the operator for the extension number, then hang up and enter the tie-line number plus the extension
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