UCLA Campus Telephone prefixes

UCLA telephone numbers are located within
 the 310 area code and encompass one of the
 following prefixes:

206
267
312
319
794
825
983

To identify the full seven-digit UCLA telephone
 number, match the last digit of the prefix to
 the first digit of the five-digit number. CTS
 also provides campus-dialing service to Santa
Monica-UCLA Medical Center. However, numbers
 ranging from 92000 to 93999 and from 95200
 to 95999 cannot be dialed directly using the
319 prefix. These five-digit numbers can only be
 dialed from another UCLA campus number or
 via Santa Monica-UCLA Medical Center Hospital
Communications.

(Taken from the CTS UCLA Telephone Features User Guide at http://www.cts.ucla.edu/support/publications/user_guides/TFUG_userguide_06.pdf)