CMU Telephone Dialing Instructions and Features
This file gives a short guide to using the CMU Centrex system. We do
not cover optional features like call pickup, call waiting and
intercom. We also do not cover the CDAR System or speed calling. For
information on those features or for telephone repairs, contact the
CMU Telecom Office
at 8-8500 (in CS call Jim Skees at 8-7653).
Dialing Instructions:
- Internal calls:
- 5 digit extension
- Local calls:
- 9 + 7 digit number
- Long distance:
- 9 + area code + 7 digit number
- International calls:
- 9 + 011 + country code + city code + local number
- Distinctive Ringing:
- One ring ... CMU caller
- Two rings ... External caller
- Three rings ... Ring again
- Operators:
- CMU ... 0
- Bell of PA ... 9+0
- AT&T ... 9+0+0
- Directory Assistance Information:
- CMU ... 0
- 412 area code ... 9 + 555-1212
- US and Canada ... 9 + 1 + area code + 555-1212
- International ... 9 + 0 + 0
- Toll Free Numbers ... 9 + 1 + 800 + 555-1212
- Dialing a CMU extension from outside CMU:
- Use area code 412 and add the 268 prefix to the beginning
of the CMU extension.
- Emergency Numbers: Monday through Friday, 7am to 5pm
- Physical Plant
- 8-2910
- Housing Services
- 8-8700
- Custodial Services
- 8-2036
- Campus Police
- 8-2323
- CMU Emergency Medical Service
- 8-2323
After 5pm and on weekends and holidays, call Campus Police for
all services.
Call Answering & Handling Features
- Depressing the Switchhook:
-
To depress the switchhook, hold it down for half a second
(saying one-one-thousand takes half a second). You should
then hear 3 fast beeps and a dial tone. If you don't hear
the 3 fast beeps, try again.
If your phone has a flash button, you can use it instead
of depressing the switchhook.
- Confirmation Tone:
- Two short tones followed by a steady dial tone.
- Call Transfer:
-
- Depress switchhook
- Dial desired party
- Announce transfer (optional)
- Hang up
- Consult:
-
Like call transfer, but the third party hangs up after the
consultation, not you. You may then resume the conversation
with the first party.
- Three Way Conference:
-
Like call transfer, but you depress the switchhook instead
of hanging up.
- Call Hold:
-
To Activate:
- Depress switchhook
- Dial #9
- Hear confirmation tone
- Call is now on hold. You may now place another call.
To return to held call:
- Hang up. Your telephone will ring
- When you answer, you will be connected to the original call.
- Call Park:
-
To park a call on your current extension:
- Depress switchhook
- Dial 170
- Hear confirmation tone and hang up.
To retrieve the parked call:
- Dial 171 and the extension where the call is parked.
To park a call on another extension:
- Depress switchhook
- Listen for 3 fast beeps, then dial tone
- Dial 175, hear 2 short tones
- Hear confirmation tone
- Dial the extension on which you want to park the call.
- Call Forwarding Variable:
-
To activate:
- Dial 172
- Dial call forwarding number (if outside, dial 9 first)
- Hear confirmation tone
To cancel:
- Dial 173
- Hear confirmation tone
If your line is forwarded, you will hear a short reminder ring on
incoming calls. You will not be able to pick up the call until
forwarding is cancelled.
Time Saving Features:
- Ring Again:
-
To activate when a busy CMU extension is encountered:
- Depress switchhook
- Listen for 3 fast beeps, then dial tone
- Dial 115
- Listen for confirmation tone
- Hang up
When busy CMU extension becomes free:
- Your telephone will ring 3 times (1 long, 2 short)
- Lift the handset, hear ringing
- Wait for called party to answer
To cancel ring again:
- Lift handset, listen for dial tone
- Dial 115
- Listen for confirmation tone
- Hang up
- Speed Calling:
-
To program:
- Lift handset, listen for dial tone
- Dial programming code 111, listen for dial tone
- Dial the access code (2-7 digits) and telephone number ot be stored
- Depress #, hear 2 short tones
- Hang up
To use:
- Lift handset, listen for dial tone
- Dial access code (2-7 digits)
- Deporess #
- Last Number Redial:
- Depress #