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Faculty and staff have 3 digit extensions in the range 100-399. You can use the LDAP Directory on the phone to search for extensions of faculty and staff, or use the phone link on portal
Classrooms are all 4 digit extensions:
Calls to the exchanges below are considered to be local. All phones are allowed to place local calls. To place a local call dial 9 followed by the 7 digit number. (9 XXX XXXX)