Direct-Dial Tie Lines

You can use these MIT direct-dial numbers to call the institutions listed below.

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	five digits	3-9200	617.253.9200
Draper Laboratory	182 + five digits	182 + 0-0000	617.258.1000
Endicott House	five digits	3-5211	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 + 4000	781.283.4000
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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