special ringback tone
speed dialing
start
one long tone followed by one short, dull tone indicating that the person you dialed is busy on a call and has Call Waiting.
feature that allows you to place a call or enter an account code by pressing the “#” and a 2- or 
feature that initiates the sending of a call to a desired telephone.
switchhook | button depressed by the handset when the  | 
  | telephone is not in use.  | 
system  | person responsible for assigning features  | 
administrator  | and overseeing System 25 operation.  | 
test | feature that allows you to test the lights and  | 
  | ringer on your SLAC and the lights on your  | 
  | Selector Console.  | 
transfer
trunk
feature that allows you to connect the person you are talking with to another person, and then drop out of the conversation.
a telecommunications line between two switching systems. (See also outside line. )
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