All internal extensions have 4 digits: dial 7 followed by the last 3 digits
Dial 911
Dial the 4-digit extension number
Dial the 5-digit extension number
Dial 9, then the phone number
Dial 8, then your authorization code, then the area code and phone number
Dial 9, then 1 800...
Press the flash button, then dial the 4-digit extension, then hang up
Press **
Adjust the volume switch on the handset to control incoming voice volume
Adjust the volume control button on the phone base to control speaker volume
Adjust the volume control button on the phone base to control ringer volume
While on a call or talking on intercom, press the handsfree button
While on a call, press flash button (you'll get a second dial tone), then dial the next number (internal, external, or long distance), then press the flash button again to join the conference
Dial *611 from the phone you want to forward, then dial the 4-digit extension to which you are forwarding
Dial *610 from the phone that was being forwarded
Dial *67, then the 4-digit extension
Dial *512, then your password (9876 is the default password you use the first time), follow the prompts to set up or change your personal message and password
Dial *510, then *, then enter your 4-digit extension
Dial your number, then immediately dial *#, you will be prompted for your voice mail password -or- dial 471-7316, then *7, and the last 3 digits of your number
Dial *5375, then the 4-digit extension (dial * to skip personal greeting)