MIT Classes of Telephone Service
Overview
MIT's classes of telephone service and restrictions are described
below. Procedures for placing telephone calls are described on the
Telephone Dialing Instructions page.
If you are unsure as to the class of service of your telephone,
check with your Administrative Officer or Telephone
Customer Service Representative. If you try to place a call
outside the restrictions of your class, you will hear a recording
or a fast busy signal.
Classes of Service
|
Class of Service |
Description
|
| Class A |
Completely unrestricted. Can direct-dial world-wide; allows
option to use MIT account code or calling card. |
| Class B1 |
Restricted. Can direct-dial local calls, or call world-wide
using MIT account code or calling card. |
| Class B2 |
Restricted. Can direct-dial local calls, or call world-wide
using calling card. |
| Class C |
Restricted. Can direct-dial only within MIT, or call world-wide
using calling card. |
| Class D |
On-campus ring-down line only. |
| Class F |
Restricted. Same as Class C, but reserved for Lobby phones.
Can direct-dial only within MIT, or call world-wide using calling
card. |
|
